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Known Exploited Vulnerabilities CVE-2021-42013 Mappings

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.

Mappings

Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name Notes
CVE-2021-42013 Apache HTTP Server Path Traversal Vulnerability exploitation_technique T1210 Exploitation of Remote Services
Comments
CVE-2021-42013 was introduced as the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50. CVE-2021-42013 is a path traversal vulnerability in Apache HTTP Server 2.4.49 that allows an attacker 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 paths, this could allow for remote code execution.
References
  1. https://blog.qualys.com/vulnerabilities-threat-research/2021/10/27/apache-http-server-path-traversal-remote-code-execution-cve-2021-41773-cve-2021-42013
  2. https://github.com/battleoverflow/apache-traversal
CVE-2021-42013 Apache HTTP Server Path Traversal Vulnerability primary_impact T1059 Command and Scripting Interpreter
Comments
CVE-2021-42013 was introduced as the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50. CVE-2021-42013 is a path traversal vulnerability in Apache HTTP Server 2.4.49 that allows an attacker 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 paths, this could allow for remote code execution.
References
  1. https://github.com/battleoverflow/apache-traversal
  2. https://blog.qualys.com/vulnerabilities-threat-research/2021/10/27/apache-http-server-path-traversal-remote-code-execution-cve-2021-41773-cve-2021-42013