CVE-2019-20897 : Vulnerability Insights and Analysis

Atlassian Jira Server versions prior to 8.5.4, between 8.6.0 and 8.6.2, and between 8.7.0 and 8.7.1 are vulnerable to a Denial of Service (DoS) attack through a specially crafted PNG file.

Understanding CVE-2019-20897

This CVE identifies a vulnerability in Atlassian Jira Server that allows remote attackers to trigger a DoS attack by exploiting the avatar upload feature.

What is CVE-2019-20897?

The CVE-2019-20897 vulnerability in Atlassian Jira Server enables attackers to execute a DoS attack using a malicious PNG file during avatar uploads.

The Impact of CVE-2019-20897

The vulnerability can lead to a Denial of Service condition, affecting the availability and performance of the Jira Server instances.

Technical Details of CVE-2019-20897

This section provides detailed technical insights into the CVE-2019-20897 vulnerability.

Vulnerability Description

The flaw in Atlassian Jira Server allows remote attackers to exploit the avatar upload feature, causing a DoS attack by uploading a specially crafted PNG file.

Affected Systems and Versions

Atlassian Jira Server versions prior to 8.5.4
Atlassian Jira Server versions between 8.6.0 and 8.6.2
Atlassian Jira Server versions between 8.7.0 and 8.7.1

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading a specifically crafted PNG file through the avatar upload feature in the affected Jira Server versions.

Mitigation and Prevention

Protect your systems from CVE-2019-20897 with the following measures:

Immediate Steps to Take

Upgrade Atlassian Jira Server to version 8.5.4 or higher.
Implement network controls to restrict access to the avatar upload feature.

Long-Term Security Practices

Regularly monitor and update security patches for Atlassian Jira Server.
Conduct security training for users to recognize and report suspicious activities.

Patching and Updates

Apply the latest security patches provided by Atlassian to address the CVE-2019-20897 vulnerability.