GitLab Community Edition/Enterprise Edition up to 13.4.6/13.5.4/13.6.1 Markdown resource consumption

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in GitLab Community Edition and Enterprise Edition up to 13.4.6/13.5.4/13.6.1 (Bug Tracking Software). Affected by this issue is an unknown code of the component Markdown Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-400. Impacted is availability. CVE summarizes:

A DOS vulnerability exists in Gitlab CE/EE >=10.3, =13.5, =13.6,

The weakness was released 12/11/2020. The advisory is shared for download at hackerone.com. This vulnerability is handled as CVE-2020-26409 since 10/01/2020. The exploitation is known to be easy. The attack may be launched remotely. A simple authentication is needed for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 13.4.7, 13.5.5 or 13.6.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at gitlab.com. The best possible mitigation is suggested to be upgrading to the latest version.

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CVSSv3infoedit

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
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Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Community Edition/Enterprise Edition 13.4.7/13.5.5/13.6.2
Patch: gitlab.com

Timelineinfoedit

10/01/2020 CVE assigned
12/11/2020 +71 days Advisory disclosed
12/11/2020 +0 days VulDB entry created
12/15/2020 +4 days VulDB last update

Sourcesinfoedit

Vendor: https://gitlab.com/

Advisory: hackerone.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2020-26409 (🔒)

Entryinfoedit

Created: 12/11/2020 09:47 AM
Updated: 12/15/2020 08:33 PM
Changes: (1) source_cve_cna
Complete: 🔍

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