Apache HTTP Server: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3348
  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)
                              8 October 2021

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        AusCERT Security Bulletin Summary
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Product:           Apache HTTP Server
Publisher:         Apache Software Foundation
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Remote/Unauthenticated
                   Reduced Security                -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-42013 CVE-2021-41773 

Reference:         ESB-2021.3287

Original Bulletin: 
   https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-42013

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critical: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 
  and 2.4.50 (incomplete fix of CVE-2021-41773) (CVE-2021-42013)

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.

Acknowledgements: Reported by Juan Escobar from Dreamlab Technologies, Fernando 
Munoz from NULL Life CTF Team, and Shungo Kumasaka

    Reported to security team	2021-10-06
    Update 2.4.51 released	2021-10-07
    Affects	2.4.50, 2.4.49

Fixed in Apache HTTP Server 2.4.51

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