CVE-2019-12300 : What You Need to Know

Buildbot versions prior to 1.8.2 and between 2.x versions before 2.3.1 are vulnerable to an authorization token issue via OAuth, allowing attackers to impersonate users.

Understanding CVE-2019-12300

Buildbot versions before 1.8.2 and 2.x before 2.3.1 have a security flaw that enables attackers to exploit user authentication using OAuth tokens.

What is CVE-2019-12300?

Buildbot versions prior to 1.8.2 and between 2.x versions before 2.3.1 possess a vulnerability where they accept an authorization token provided by the user via OAuth. This token is then utilized for user authentication. If an attacker possesses a token that grants them permission to view the personal information of a victim, they can exploit this to log in as the victim.

The Impact of CVE-2019-12300

This vulnerability allows attackers to impersonate users by exploiting OAuth tokens, potentially gaining unauthorized access to sensitive information and performing malicious actions on behalf of victims.

Technical Details of CVE-2019-12300

Buildbot's vulnerability lies in its handling of user-submitted OAuth tokens for authentication, leading to the risk of unauthorized access.

Vulnerability Description

Buildbot before 1.8.2 and 2.x before 2.3.1 accepts a user-submitted authorization token from OAuth and uses it to authenticate a user. If an attacker has a token allowing them to read the user details of a victim, they can log in as the victim.

Affected Systems and Versions

Buildbot versions prior to 1.8.2
Buildbot 2.x versions before 2.3.1

Exploitation Mechanism

Attackers exploit the vulnerability by obtaining an OAuth token that grants access to a victim's personal information, enabling them to impersonate the victim and gain unauthorized access.

Mitigation and Prevention

To address CVE-2019-12300, users and organizations should take immediate steps and implement long-term security practices.

Immediate Steps to Take

Upgrade Buildbot to version 1.8.2 or above to mitigate the vulnerability.
Monitor user authentication activities for any suspicious behavior.

Long-Term Security Practices

Regularly review and update OAuth token management policies.
Conduct security training for users on safe authentication practices.

Patching and Updates

Apply patches provided by Buildbot promptly to address the vulnerability and enhance system security.