CVE-2019-20100 : What You Need to Know

Atlassian Application Links plugin vulnerability allows for CSRF attacks, affecting various versions. Jira Server is also impacted.

Understanding CVE-2019-20100

This CVE involves a security flaw in the Atlassian Application Links plugin, potentially leading to CSRF attacks.

What is CVE-2019-20100?

The vulnerability in the Atlassian Application Links plugin can be exploited for cross-site request forgery (CSRF) attacks. Affected versions include those before 5.4.21, between 6.0.0 and 6.0.12, 6.1.0 and 6.1.2, 7.0.0 and 7.0.2, and 7.1.0 and 7.1.3.

The Impact of CVE-2019-20100

The vulnerability allows attackers to deceive administrative users into executing malicious HTTP requests, potentially gaining access to enumerate hosts and open ports within the internal network where Jira server is deployed.

Technical Details of CVE-2019-20100

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The Atlassian Application Links plugin is susceptible to CSRF attacks, enabling malicious exploitation.

Affected Systems and Versions

Atlassian Application Links versions prior to 5.4.21
Versions between 6.0.0 and 6.0.12
Versions between 6.1.0 and 6.1.2
Versions between 7.0.0 and 7.0.2
Versions between 7.1.0 and 7.1.3
Atlassian Jira Server versions before 8.7.0

Exploitation Mechanism

Attackers can trick administrative users into executing harmful HTTP requests, potentially compromising the internal network.

Mitigation and Prevention

Protecting systems from CVE-2019-20100 is crucial to maintaining security.

Immediate Steps to Take

Update Atlassian Application Links to versions beyond the vulnerable ones.
Educate users on recognizing and avoiding CSRF attacks.

Long-Term Security Practices

Regularly monitor and audit network traffic for suspicious activities.
Implement strict access controls and authentication mechanisms.

Patching and Updates

Apply security patches provided by Atlassian promptly to address the vulnerability.