CVE-2020-14189 : Exploit Details and Defense Strategies

Atlassian's gajira-comment GitHub Action before version 2.0.2 is vulnerable to remote code execution via specially crafted GitHub issue comments.

Understanding CVE-2020-14189

This CVE involves a template injection vulnerability in the Atlassian gajira-comment GitHub Action.

What is CVE-2020-14189?

The execute function in the Atlassian gajira-comment GitHub Action before version 2.0.2 allows remote attackers to execute arbitrary code in the context of a GitHub runner by creating a specially crafted GitHub issue comment.

The Impact of CVE-2020-14189

This vulnerability could be exploited by malicious actors to execute arbitrary code on the affected system, potentially leading to unauthorized access or data breaches.

Technical Details of CVE-2020-14189

The technical aspects of this CVE are as follows:

Vulnerability Description

The vulnerability lies in the execute function of the Atlassian gajira-comment GitHub Action, enabling remote code execution through manipulated GitHub issue comments.

Affected Systems and Versions

Product: gajira-comment
Vendor: Atlassian
Versions Affected: < 2.0.2 (unspecified version type)

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting GitHub issue comments in a specific way to trigger the execution of arbitrary code on the GitHub runner.

Mitigation and Prevention

To address CVE-2020-14189, consider the following mitigation strategies:

Immediate Steps to Take

Upgrade to version 2.0.2 or newer of the Atlassian gajira-comment GitHub Action.
Monitor GitHub issue comments for any suspicious or unexpected content.

Long-Term Security Practices

Regularly review and update GitHub Actions and dependencies to ensure the latest security patches are applied.
Implement code review processes to detect and prevent vulnerabilities in GitHub Actions.

Patching and Updates

Stay informed about security advisories and updates from Atlassian regarding the gajira-comment GitHub Action.
Apply patches and updates promptly to mitigate the risk of exploitation.