Known exploited vulnerability
CVE-2018-20250
The short answer
CVE-2018-20250 affects Check Point Software Technologies Ltd. WinRAR and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-02-15: attackers are using it, so patch it first.
What it is
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.
Severity
7.8 high
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Feb 15, 2022
Federal due date Aug 15, 2022
EPSS, next 30 days
96%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
WinRAR. NVD's record lists the exact affected versions.
References
- github.com/blau72/CVE-2018-20250-WinRAR-ACE ExploitThird Party Advisory
- research.checkpoint.com/extracting-code-execution-from-winrar/ ExploitPress/Media CoverageThird Party Advisory
- www.exploit-db.com/exploits/46552/ ExploitThird Party AdvisoryVDB Entry
- www.exploit-db.com/exploits/46756/ ExploitThird Party AdvisoryVDB Entry
- www.win-rar.com/whatsnew.html Release Notes
- github.com/blau72/CVE-2018-20250-WinRAR-ACE ExploitThird Party Advisory
- research.checkpoint.com/extracting-code-execution-from-winrar/ ExploitPress/Media CoverageThird Party Advisory
- www.exploit-db.com/exploits/46552/ ExploitThird Party AdvisoryVDB Entry
- www.exploit-db.com/exploits/46756/ ExploitThird Party AdvisoryVDB Entry
- www.win-rar.com/whatsnew.html Release Notes
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-20250 US Government Resource
Questions
Is CVE-2018-20250 being exploited?
Yes. CISA added CVE-2018-20250 to its Known Exploited Vulnerabilities catalog on 2022-02-15, with a federal remediation due date of 2022-08-15. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2018-20250?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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