CVE-2018-20251 Information

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.

CVSS Vector

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

Reference

http://www.securityfocus.com/bid/106948 https://research.checkpoint.com/extracting-code-execution-from-winrar/ https://www.win-rar.com/whatsnew.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.5