U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

NOTICE

NIST is currently working to establish a consortium to address challenges in the NVD program and develop improved tools and methods. You will temporarily see delays in analysis efforts during this transition. We apologize for the inconvenience and ask for your patience as we work to improve the NVD program.

CVE-2021-41773 Detail

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.


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

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

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%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/
https://security.gentoo.org/glsa/202208-20 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 
https://www.oracle.com/security-alerts/cpujan2022.html Patch  Third Party Advisory 

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name Date Added Due Date Required Action
Apache HTTP Server Path Traversal Vulnerability 11/03/2021 11/17/2021 Apply updates per vendor instructions.

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   Provider acceptance level Apache Software Foundation  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

30 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-41773
NVD Published Date:
10/05/2021
NVD Last Modified:
11/06/2023
Source:
Apache Software Foundation