Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 (CVE-2021-41773)

CVE number = CVE-2021-41773

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49.

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 is known to be exploited in the wild.

This issue only affects Apache 2.4.49 and not earlier versions.

Acknowledgements: This issue was reported by Ash Daulton along with the cPanel Security Team


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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