CVE-2018-20250 on CISA KEV

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

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• github.com — https://github.com/blau72/CVE-2018-20250-WinRAR-ACE
• research.checkpoint.com — https://research.checkpoint.com/extracting-code-execution-from-winrar/
• www.exploit-db.com — https://www.exploit-db.com/exploits/46552/
• www.securityfocus.com — http://www.securityfocus.com/bid/106948
• www.win-rar.com — https://www.win-rar.com/whatsnew.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/152618/RARLAB-WinRAR-ACE-Format-Input-Valid…
• www.rapid7.com — http://www.rapid7.com/db/modules/exploit/windows/fileformat/winrar_ace
• www.exploit-db.com — https://www.exploit-db.com/exploits/46756/

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Check Point Software Technologies Ltd.	WinRAR	All versions prior and including 5.61

06Detection

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