SB2021081044 - Multiple vulnerabilities in GitLab
Published: August 10, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper Authorization (CVE-ID: CVE-2021-22237)
The vulnerability allows a remote user to bypass implemented security restrictions.
The vulnerability exists due to improper handling of impersonation tokens. Under specialized conditions, GitLab may allow a user with an impersonation token to perform Git actions even if impersonation is disabled.
2) Input validation error (CVE-ID: CVE-2021-22236)
The vulnerability allows a remote user to bypass implemented security restrictions.
The vulnerability exists due to improper handling of OAuth client IDs. New subscriptions generated OAuth tokens on an incorrect OAuth client application. As a result, a remote user can obtain access to another user account.
3) Improper access control (CVE-ID: CVE-2021-22239)
The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. A remote user can bypass implemented security restrictions and add metadata upon issue creation.
4) Stored cross-site scripting (CVE-ID: N/A)
The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data when viewing mardown files. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Remediation
Install update from vendor's website.