CVE-2021-41773 Information
Share on: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 equire 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.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Reference
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/[email protected]/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ https://lists.fedoraproject.org/archives/list/[email protected]/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ http://www.openwall.com/lists/oss-security/2021/10/15/3 http://www.openwall.com/lists/oss-security/2021/10/16/1 http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html https://security.netapp.com/advisory/ntap-20211029-0009/ http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html https://www.oracle.com/security-alerts/cpujan2022.html
Attack Complexity
LOW
Privileges Required
NONE
User Interaction Required
NONE
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
HIGH
Availability Impact
NONE
Base Score
NONE
Base Severity
7.5