Vulnerability CVE-2021-41773
Published: 2021-10-05

Description:
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. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Apache HTTP Server 2.4.49 Path Traversal
Lucas Souza
06.10.2021
High
Apache HTTP Server 2.4.50 Remote Code Execution Py ver
Valentin Lobstei...
24.11.2021

Type:

CWE-22

 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Apache -> Http server 

 References:
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E
http://www.openwall.com/lists/oss-security/2021/10/05/2
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html
http://www.openwall.com/lists/oss-security/2021/10/07/1
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E
http://www.openwall.com/lists/oss-security/2021/10/07/6
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ
http://www.openwall.com/lists/oss-security/2021/10/08/1
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/11/4
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/
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