WinRAR <6.23 RCE via ZIP Filename Collision
CVE-2023-38831 Published on August 23, 2023
RARLAB WinRAR before 6.23 allows attackers to execute arbitrary code when a user attempts to view a benign file within a ZIP archive. The issue occurs because a ZIP archive may include a benign file (such as an ordinary .JPG file) and also a folder that has the same name as the benign file, and the contents of the folder (which may include executable content) are processed during an attempt to access only the benign file. This was exploited in the wild in April through October 2023.
Known Exploited Vulnerability
This RARLAB WinRAR Code Execution Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. RARLAB WinRAR contains an unspecified vulnerability that allows an attacker to execute code when a user attempts to view a benign file within a ZIP archive.
The following remediation steps are recommended / required by September 14, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2023-38831 can be exploited 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
Insufficient Type Distinction
The software does not properly distinguish between different types of elements in a way that leads to insecure behavior.
Products Associated with CVE-2023-38831
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Exploit 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.