CVE-2023-38831 on CISA KEV

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 b

01What CISA says about this vulnerability

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…

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

• www.group-ib.com — https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/
• www.bleepingcomputer.com — https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-a…
• news.ycombinator.com — https://news.ycombinator.com/item?id=37236100
• packetstormsecurity.com — http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html
• blog.google — https://blog.google/threat-analysis-group/government-backed-actors-exploiting-wi…

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
n	a / n/a	n/a

06Detection

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