CVE-2021-41773 vulnerability in Apache and Other Products
Published on October 5, 2021
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
Known Exploited Vulnerability
This Apache HTTP Server Path Traversal Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. 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 .
The following remediation steps are recommended / required by November 17, 2021: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2021-41773 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Timeline
reported
fixed by r1893775 in 2.4.50 2 days later.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2021-41773 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2021-41773
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Affected Versions
Apache Software Foundation Apache HTTP Server Version Apache HTTP Server 2.4 2.4.49 is affected by CVE-2021-41773Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.