CVE-2021-26069 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2021-26069, a vulnerability in Atlassian Jira Server and Data Center that allows unauthenticated remote attackers to exploit an Information Disclosure flaw.

Understanding CVE-2021-26069

CVE-2021-26069 is a security vulnerability identified in Atlassian Jira Server and Data Center that enables unauthenticated remote attackers to download temporary files and enumerate project keys through a specific API endpoint.

What is CVE-2021-26069?

Affected versions of Atlassian Jira Server and Data Center are susceptible to unauthenticated remote attacks that lead to an Information Disclosure issue. Attackers can exploit this vulnerability to access temporary files and extract project keys through the /rest/api/1.0/issues/{id}/ActionsAndOperations API endpoint.

The Impact of CVE-2021-26069

The impact of CVE-2021-26069 is significant as it allows malicious actors to gather sensitive information from vulnerable systems without authentication. This could result in unauthorized access to critical data and compromise the confidentiality of projects using Jira Server and Data Center.

Technical Details of CVE-2021-26069

The technical details of CVE-2021-26069 include a description of the vulnerability, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability lies in the improper handling of requests in the /rest/api/1.0/issues/{id}/ActionsAndOperations API endpoint, leading to unauthorized access to temporary files and project keys.

Affected Systems and Versions

The vulnerability affects Atlassian Jira Server versions before 8.5.11, versions from 8.6.0 to 8.13.3, and versions from 8.14.0 to 8.15.0. Additionally, Atlassian Jira Data Center versions matching these criteria are also impacted.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending crafted requests to the vulnerable API endpoint, enabling them to download temporary files and enumerate project keys without authentication.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-26069, it is crucial to take immediate steps, maintain long-term security practices, and apply necessary patches and updates.

Immediate Steps to Take

Immediately restrict access to the vulnerable API endpoint, monitor for any suspicious activities, and consider implementing additional security controls to prevent unauthorized access.

Long-Term Security Practices

Ensure regular security assessments, conduct vulnerability scans, implement access controls, and educate users on secure practices to enhance the overall security posture of Jira Server and Data Center.

Patching and Updates

Atlassian has released patches to address the vulnerability. It is recommended to apply the latest security updates provided by the vendor to protect your systems from potential exploitation.