GitLab CVE-2018-19495 Server Side Request Forgery Security Bypass Vulnerability

Description

GitLab is prone to a security bypass vulnerability. An attacker can exploit this issue to bypass security restrictions and perform unauthorized actions. This may aid in further attacks. GitLab versions prior to 11.3.11, 11.4.x prior to 11.4.8 and 11.5.x prior to 11.5.1 are vulnerable.

Technologies Affected

• Gitlab GitLab Community Edition 10.1
• Gitlab GitLab Community Edition 10.2
• Gitlab GitLab Community Edition 10.3
• Gitlab GitLab Community Edition 10.5.0
• Gitlab GitLab Community Edition 10.5.8
• Gitlab GitLab Community Edition 10.6.0
• Gitlab GitLab Community Edition 10.6.5
• Gitlab GitLab Community Edition 10.7.0
• Gitlab GitLab Community Edition 10.7.2
• Gitlab GitLab Community Edition 11.0
• Gitlab GitLab Community Edition 11.3.0
• Gitlab GitLab Community Edition 11.4
• Gitlab GitLab Community Edition 11.4.0
• Gitlab GitLab Community Edition 11.5
• Gitlab GitLab Community Edition 11.5.0
• Gitlab GitLab Enterprise Edition 10.1
• Gitlab GitLab Enterprise Edition 10.2
• Gitlab GitLab Enterprise Edition 10.3
• Gitlab GitLab Enterprise Edition 10.5.0
• Gitlab GitLab Enterprise Edition 10.5.8
• Gitlab GitLab Enterprise Edition 10.6.0
• Gitlab GitLab Enterprise Edition 10.6.5
• Gitlab GitLab Enterprise Edition 10.7.0
• Gitlab GitLab Enterprise Edition 10.7.2
• Gitlab GitLab Enterprise Edition 11.0
• Gitlab GitLab Enterprise Edition 11.3.0
• Gitlab GitLab Enterprise Edition 11.4
• Gitlab GitLab Enterprise Edition 11.4.0
• Gitlab GitLab Enterprise Edition 11.5
• Gitlab GitLab Enterprise Edition 11.5.0

Recommendations

Block external access at the network boundary, unless external parties require service.
Block external access at the network boundary, unless external parties require service. Filter access to the affected computer at the network boundary if global access isn’t needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
Attackers may successfully exploit client flaws in the browser through cross-site scripting vulnerabilities. When possible, run client software as regular user accounts with limited access to system resources. This may limit the immediate consequences of client-side vulnerabilities.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity including unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to websites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Updates are available. Please see the references or vendor advisory for more information.