CVE-2019-12156 Explained : Impact and Mitigation

JetBrains TeamCity and UpSource versions before 2018.2.5 and 2018.2 build 1293 allowed the exposure of server metadata due to error messages reflecting the entire response back to the client.

Understanding CVE-2019-12156

This CVE highlights a vulnerability in JetBrains TeamCity and UpSource that could lead to the exposure of server metadata.

What is CVE-2019-12156?

In earlier versions of JetBrains TeamCity before 2018.2.5 and UpSource before 2018.2 build 1293, the vulnerability allowed the reflection of the entire response back to the client, potentially exposing server metadata.

The Impact of CVE-2019-12156

The exposure of server metadata could lead to security risks and potential unauthorized access to sensitive information stored on the server.

Technical Details of CVE-2019-12156

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability stemmed from error messages reflecting the entire response back to the client, enabling the exposure of server metadata.

Affected Systems and Versions

JetBrains TeamCity versions before 2018.2.5
UpSource versions before 2018.2 build 1293

Exploitation Mechanism

By exploiting this vulnerability, attackers could potentially access sensitive server metadata through reflected error messages.

Mitigation and Prevention

Protecting systems from CVE-2019-12156 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update JetBrains TeamCity and UpSource to versions 2018.2.5 and 2018.2 build 1293 respectively.
Monitor server logs for any unusual activities indicating potential exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network segmentation to limit access to sensitive server data.

Patching and Updates

Ensure that all software components, including JetBrains TeamCity and UpSource, are regularly patched and updated to prevent vulnerabilities like CVE-2019-12156.