Description
Cytrix has detected that the version of Apache HTTP Server being used is vulnerable to a Path Traversal attack (CWE-22).
The CVE-2021-42013 exist due to the fact that a fix for a previous problem, CVE-2021-41773 was insufficient.
An attacker could use a Path Traversal attack to map URLs to files outside the directories that are 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.
Remote code execution is also possible if CGI scripts are also enabled for these aliased pathes.
Remote attackers could abuse this Information Disclosure to obtain potentially sensitive information, assisting them in initiating attacks.
Recommendation
It was found that CVE-2021-42013 only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions, so you can downgrade if this is your wish.
To properly fix this issue, upgrade the version of Apache HTTP Server being used to 2.4.51 or higher.
References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42013
