Path Traversal and Remote Code Execution in Apache HTTP Server (incomplete fix of CVE-2021-41773) (CVE-2021-42013)

It was discovered 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.

The new assigned CVE for this is CVE-2021-42013

Duncan

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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