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CVE-2018-20251

5.5 · MEDIUM

In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format.

Published Feb 5, 2019CWE-693EPSS 31.40%

Overview

CVE-2018-20251 is a medium-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd to abort the extraction process. the operation is cancelled only after the folders and files were created but prior to them being written, therefore allowing the attacker to create empty files and folders everywhere in the file system.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/106948Refresearch.checkpoint.com/extracting-code-execution-from-winrar/Refwww.win-rar.com/whatsnew.htmlRefwww.securityfocus.com/bid/106948Refresearch.checkpoint.com/extracting-code-execution-from-winrar/Refwww.win-rar.com/whatsnew.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20251?

CVE-2018-20251 is a medium-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-20251?

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20251?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-20251?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20251 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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