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CVE-2023-3994— Inefficient Regular Expression Complexity in GitLab

Quick assessment

Affected
GitLab GitLab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitLab是美国GitLab公司的一个开源的端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE/EE 9.3 到 16.0.8版本、16.1.3 之前版本、16.2.2 之前版本存在安全漏洞，该漏洞源于通过将使用 ProjectReferenceFilter 设计的有效负载发送到 Preview_markdown 端点，可以实现正则表达式拒绝服务。

CVSS 7.5 · High EPSS 0.96% · P60

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-3994

Vulnerability Information
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Vulnerability Title
Inefficient Regular Expression Complexity in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
An issue has been discovered in GitLab CE/EE affecting all versions starting from 9.3 before 16.0.8, all versions starting from 16.1 before 16.1.3, all versions starting from 16.2 before 16.2.2. A Regular Expression Denial of Service was possible via sending crafted payloads which use ProjectReferenceFilter to the preview_markdown endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司的一个开源的端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE/EE 9.3 到 16.0.8版本、16.1.3 之前版本、16.2.2 之前版本存在安全漏洞，该漏洞源于通过将使用 ProjectReferenceFilter 设计的有效负载发送到 Preview_markdown 端点，可以实现正则表达式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 9.3 ~ 16.0.8 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2023-3994

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III. Intelligence Information for CVE-2023-3994

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Other References for CVE-2023-3994 (2)

Same Patch Batch · GitLab · 2023-08-02 · 7 CVEs total

CVE-2023-3993 4.9 MEDIUM Insertion of Sensitive Information into Log File in GitLab
CVE-2023-3401 4.8 MEDIUM Improper Control of Generation of Code ('Code Injection') in GitLab
CVE-2023-3500 4.8 MEDIUM Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2023-2022 4.3 MEDIUM Missing Authorization in GitLab
CVE-2023-4011 4.3 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2023-3900 4.3 MEDIUM Improper Validation of Specified Type of Input in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-1333

V. Comments for CVE-2023-3994

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