CVE-2018-20251

Winrar vulnerability

CVSS

5.5

EPSS

31.5%

EPSS pct

98th

Exploited

No known

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.

Affected vendor

Rarlab

Affected product

Winrar

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Weakness type (CWE)

CWE-693
CWE-22 — Path Traversal

Published

2019-02-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 31.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2018-20251

Confirm whether Rarlab Winrar is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-20251.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-20251

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