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CVE-2021-41773 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit  Third Party Advisory  VDB Entry 
http://www.openwall.com/lists/oss-security/2021/10/05/2 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/07/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/07/6 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/1 Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/2 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/3 Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/4 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/5 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/6 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/09/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/11/4 Mailing List  Patch  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/15/3 Mailing List  Patch  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/16/1 Mailing List  Third Party Advisory 
https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E Mailing List  Patch  Vendor Advisory 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E Mailing List  Vendor Advisory 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E Mailing List  Vendor Advisory 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E Mailing List  Vendor Advisory 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E Mailing List  Vendor Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Mailing List  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20211029-0009/ Third Party Advisory 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') cwe source acceptance level NIST   Contributor acceptance level Apache Software Foundation  

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Change History

25 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-41773
NVD Published Date:
10/05/2021
NVD Last Modified:
11/30/2021
Source:
Apache Software Foundation