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AUSCERT External Security Bulletin Redistribution
Path traversal and file disclosure vulnerability in Apache
HTTP Server 2.4.49 (CVE-2021-41773)
6 October 2021
AusCERT Security Bulletin Summary
Product: Apache HTTP Server
Publisher: Apache Software Foundation
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2021-41773
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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 expected document root.
If files outside of the document root are not protected by "require all
denied" these requests can succeed. Additionally this flaw could leak the
source of interpreted files like CGI scripts.
This issue is known to be exploited in the wild.
This issue only affects Apache 2.4.49 and not earlier versions.
Acknowledgements: This issue was reported by Ash Daulton along with the
cPanel Security Team
Reported to security team 2021-09-29
fixed by r1893775 in 2.4.50 2021-10-01
Update 2.4.50 released 2021-10-04
Fixed in Apache HTTP Server 2.4.50
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