SB2020031138 - Multiple vulnerabilities in Jenkins Mac Plugin

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2020-2146)

The vulnerability allows a remote attacker to perform a man-in-the-middle (MiTM) attack.

The vulnerability exists due to the affected plugin does not use SSH host key validation when connecting to Mac Cloud host. A remote attacker can perform a man-in-the-middle attack to intercept these connections to build agents.

2) Cross-site request forgery (CVE-ID: CVE-2020-2147)

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to the form validation method does not require POST requests. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

3) Improper access control (CVE-ID: CVE-2020-2148)

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the affected plugin does not perform permission checks on a method implementing form validation. A remote user with Overall/Read access can connect to an attacker-specified SSH host using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.

Remediation

Install update from vendor's website.

References

• http://www.openwall.com/lists/oss-security/2020/03/09/1
• https://jenkins.io/security/advisory/2020-03-09/#SECURITY-1692
• https://jenkins.io/security/advisory/2020-03-09/#SECURITY-1761