CVE-2019-20418 : Security Advisory and Response

Atlassian Jira Server and Data Center versions prior to 8.8.0 are vulnerable to a remote Application Denial of Service attack through the /rendering/wiki endpoint.

Understanding CVE-2019-20418

This CVE involves a vulnerability in Atlassian Jira Server and Data Center that allows remote attackers to disrupt user access to the instance.

What is CVE-2019-20418?

The /rendering/wiki endpoint in Atlassian Jira Server and Data Center versions before 8.8.0 is susceptible to a remote Application Denial of Service attack. This exploit can be used by malicious actors to impede user access to the affected instance.

The Impact of CVE-2019-20418

The vulnerability enables remote attackers to obstruct users from accessing the Jira Server or Data Center instance, leading to a denial of service condition.

Technical Details of CVE-2019-20418

This section provides more technical insights into the CVE.

Vulnerability Description

The /rendering/wiki endpoint in Atlassian Jira Server and Data Center versions prior to 8.8.0 contains a security flaw that allows remote attackers to execute an Application Denial of Service attack.

Affected Systems and Versions

Product: Jira Server
Vendor: Atlassian
Versions Affected: Before 8.8.0
Version Type: Custom

Exploitation Mechanism

The vulnerability can be exploited remotely by attackers to disrupt user access to the Jira Server or Data Center instance through the /rendering/wiki endpoint.

Mitigation and Prevention

Protecting systems from CVE-2019-20418 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Jira Server and Data Center to version 8.8.0 or newer to mitigate the vulnerability.
Monitor network traffic for any suspicious activity targeting the /rendering/wiki endpoint.

Long-Term Security Practices

Regularly apply security patches and updates to all software components.
Implement network security measures to detect and prevent denial of service attacks.

Patching and Updates

Atlassian has released version 8.8.0 to address the vulnerability. Ensure timely installation of this update to secure the system.