GitLab fixed a critical zero-click account hijacking flaw

Pierluigi Paganini January 13, 2024

GitLab addressed two critical flaws impacting both the Community and Enterprise Edition, including a critical zero-click account hijacking vulnerability

GitLab has released security updates to address two critical vulnerabilities impacting both the Community and Enterprise Edition.

The most critical vulnerability, tracked as CVE-2023-7028 (CVSS score 10), is an account takeover via Password Reset. The flaw can be exploited to hijack an account without any interaction.

“An issue has been discovered in GitLab CE/EE affecting all versions from 16.1 prior to 16.1.6, 16.2 prior to 16.2.9, 16.3 prior to 16.3.7, 16.4 prior to 16.4.5, 16.5 prior to 16.5.6, 16.6 prior to 16.6.4, and 16.7 prior to 16.7.2 in which user account password reset emails could be delivered to an unverified email address.” reads the advisory published by GitLab.

The flaws impact the following versions:

  • 16.1 prior to 16.1.5
  • 16.2 prior to 16.2.8
  • 16.3 prior to 16.3.6
  • 16.4 prior to 16.4.4
  • 16.5 prior to 16.5.6
  • 16.6 prior to 16.6.4
  • 16.7 prior to 16.7.2

The company is not aware of attacks in the wild exploiting the vulnerability CVE-2023-7028. Self-managed customers are recommended to review their logs to check for possible attempts to exploit this vulnerability:

  • Check gitlab-rails/production_json.log for HTTP requests to the /users/password path with consisting of a JSON array with multiple email addresses.
  • Check gitlab-rails/audit_json.log for entries with of PasswordsController#create and target_details consisting of a JSON array with multiple email addresses.

The second vulnerability fixed by the company, tracked as CVE-2023-5356 (CVSS score 9.6) can be exploited by an attacker to abuse Slack/Mattermost integrations and execute slash commands as another user.

“Incorrect authorization checks in GitLab CE/EE from all versions starting from 8.13 before 16.5.6, all versions starting from 16.6 before 16.6.4, all versions starting from 16.7 before 16.7.2, allows a user to abuse Slack/Mattermost integrations to execute slash commands as another user.” reads the advisory.

GitLab also addressed the following issues with the release of the version 16.7.2:

  1. CVE-2023-4812: Bypass CODEOWNERS approval removal.
  2. CVE-2023-6955: Improper access control for Workspaces.
  3. CVE-2023-2030: Commit signature validation ignores headers after signature.

The company urges organizations to update their installations immediately.

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Pierluigi Paganini

(SecurityAffairs – hacking, GitLab)

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