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How the mentioned CVE works:
This vulnerability exploits WinRAR’s improper sanitization of file paths during archive extraction. Attackers craft malicious archives containing files with directory traversal sequences (e.g., “..\”) in their paths. When a user extracts the archive, WinRAR resolves these paths incorrectly, allowing files to be written outside the intended directory. For instance, a path like “....\Windows\System32\malicious.dll” could place a DLL in a system folder. By combining this with techniques like DLL hijacking or placing executables in startup folders, attackers achieve remote code execution. User interaction is required—the victim must open the malicious archive. The flaw lies in the path validation logic, where relative paths are not normalized before file operations. This enables overwriting critical files or deploying malware. The attack leverages the user’s privileges, executing code in their context, which can lead to full system compromise. The CVSS score of 7.8 reflects high severity due to low attack complexity, no privileges required, and high impact on confidentiality, integrity, and availability.
DailyCVE Form:
Platform: RARLAB WinRAR
Version: Unspecified versions
Vulnerability: Directory Traversal RCE
Severity: High
Date: Not provided
Prediction: Patch date TBA
What Undercode Say:
Analytics:
- Bash command: `rar a exploit.rar “..\..\Windows\System32\malware.dll”`
– Code snippet: Crafting paths with “../” sequences. - Simulating extraction: `unrar e malicious.rar` (if unrar available).
How Exploit:
- Create archive with traversal paths.
- Lure user to extract.
- Execute code via hijacked DLLs.
Protection from this CVE:
- Update WinRAR.
- Avoid unknown archives.
- Use security software.
Impact:
- Remote code execution.
- System compromise.
- Data theft.
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Sources:
Reported By: www.cve.org
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