CVE-2017-16921 Explained : Impact and Mitigation

From OTRS version 6.0.x to 6.0.1, 5.0.x to 5.0.24, and 4.0.x to 4.0.26, a vulnerability allows a logged-in attacker with agent privileges to execute unauthorized shell commands using certain form parameters associated with PGP.

Understanding CVE-2017-16921

This CVE identifies a security vulnerability in OTRS versions 4.0.x to 4.0.26, 5.0.x to 5.0.24, and 6.0.x to 6.0.1 that enables an attacker to run unauthorized shell commands.

What is CVE-2017-16921?

In OTRS versions 4.0.x to 4.0.26, 5.0.x to 5.0.24, and 6.0.x to 6.0.1, a flaw allows a logged-in attacker with agent privileges to exploit specific form parameters related to PGP, leading to the execution of unauthorized shell commands.

The Impact of CVE-2017-16921

The vulnerability permits an attacker to execute arbitrary shell commands with the permissions of either the OTRS or web server user, potentially leading to unauthorized system access and data compromise.

Technical Details of CVE-2017-16921

This section provides detailed technical insights into the CVE-2017-16921 vulnerability.

Vulnerability Description

The flaw in OTRS versions 4.0.x to 4.0.26, 5.0.x to 5.0.24, and 6.0.x to 6.0.1 allows a logged-in attacker to manipulate specific form parameters associated with PGP, enabling the execution of unauthorized shell commands.

Affected Systems and Versions

OTRS 4.0.x to 4.0.26
OTRS 5.0.x to 5.0.24
OTRS 6.0.x to 6.0.1

Exploitation Mechanism

The vulnerability can be exploited by a logged-in attacker with agent privileges who manipulates form parameters related to PGP, allowing the execution of unauthorized shell commands.

Mitigation and Prevention

Protect your systems from CVE-2017-16921 with the following measures:

Immediate Steps to Take

Update OTRS to the latest patched version.
Restrict agent privileges to minimize the impact of potential attacks.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Conduct regular security audits and penetration testing.
Educate users on safe computing practices and the importance of security awareness.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.