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CVE

CVE-2021-41773

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49.
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CVE

CVE-2021-41773

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49.

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C
H
U
-

Related Resources

No items found.

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?fieldcve=CVE-2021-41773, http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html, http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html, http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html, http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html, http://www.openwall.com/lists/oss-security/2021/10/05/2, http://www.openwall.com/lists/oss-security/2021/10/07/1, http://www.openwall.com/lists/oss-security/2021/10/07/6, http://www.openwall.com/lists/oss-security/2021/10/08/1, http://www.openwall.com/lists/oss-security/2021/10/08/2, http://www.openwall.com/lists/oss-security/2021/10/08/3, http://www.openwall.com/lists/oss-security/2021/10/08/4, http://www.openwall.com/lists/oss-security/2021/10/08/5, http://www.openwall.com/lists/oss-security/2021/10/08/6, http://www.openwall.com/lists/oss-security/2021/10/09/1, http://www.openwall.com/lists/oss-security/2021/10/11/4, http://www.openwall.com/lists/oss-security/2021/10/15/3, http://www.openwall.com/lists/oss-security/2021/10/16/1, https://httpd.apache.org/security/vulnerabilities24.html, 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, https://security.netapp.com/advisory/ntap-20211029-0009/, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ, https://www.oracle.com/security-alerts/cpujan2022.html, 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

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.94377%
EPSS Percentile
0.99963%
Introduced Version
0
Fix Available
2.4.50-1,2.4.50-r0,1:2.4.51-1.94.amzn1,0:2.4.51-1.94.amzn1,0:2.4.51-1.amzn2,1:2.4.51-1.amzn2

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