CVE Vulnerabilities

CVE-2023-2198

Inefficient Regular Expression Complexity

Published: Jun 07, 2023 | Modified: Jun 14, 2023
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.7 before 15.10.8, all versions starting from 15.11 before 15.11.7, all versions starting from 16.0 before 16.0.2. A Regular Expression Denial of Service was possible via sending crafted payloads to the preview_markdown endpoint.

Weakness

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

Affected Software

Name Vendor Start Version End Version
Gitlab Gitlab 8.7.0 (including) 15.10.8 (excluding)
Gitlab Gitlab 15.11.0 (including) 15.11.7 (excluding)
Gitlab Gitlab 16.0.0 (including) 16.0.2 (excluding)
Gitlab Ubuntu bionic *
Gitlab Ubuntu trusty *
Gitlab Ubuntu xenial *

Extended Description

	  Attackers can create crafted inputs that
	  intentionally cause the regular expression to use
	  excessive backtracking in a way that causes the CPU
	  consumption to spike.

Potential Mitigations

References