CVE-2018-20250 is a vulnerability in Rarlab Winrar
Published on February 5, 2019
In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.
Known Exploited Vulnerability
This WinRAR Absolute Path Traversal Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. WinRAR Absolute Path Traversal vulnerability leads to Remote Code Execution.
The following remediation steps are recommended / required by August 15, 2022: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2018-20250 is exploitable with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Absolute Path Traversal
The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory. This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory.
Products Associated with CVE-2018-20250
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Affected Versions
Check Point Software Technologies Ltd. WinRAR Version All versions prior and including 5.61 is affected by CVE-2018-20250Exploit 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.