CVE-2017-18096 Explained : Impact and Mitigation

Atlassian Application Links before 5.2.7, between 5.3.0 and 5.3.4, and between 5.4.0 and 5.4.3 are vulnerable to a Server-Side Request Forgery (SSRF) issue that allows attackers to access internal network resources.

Understanding CVE-2017-18096

This CVE involves a security vulnerability in Atlassian Application Links that enables attackers with administrative rights to exploit SSRF.

What is CVE-2017-18096?

The OAuth status rest resource in Atlassian Application Links has a security flaw that allows attackers to remotely access internal network resources by leveraging SSRF.

The Impact of CVE-2017-18096

Attackers with administrative privileges can access internal network resources remotely.
Exploiting this vulnerability involves creating an OAuth application link controlled by the attacker.
In environments like Amazon EC2, attackers can gain access to confidential information.

Technical Details of CVE-2017-18096

Atlassian Application Links versions before 5.2.7, between 5.3.0 and 5.3.4, and between 5.4.0 and 5.4.3 are affected.

Vulnerability Description

Attackers can exploit SSRF to redirect access from the linked location's OAuth status rest resource to an internal location.

Affected Systems and Versions

Versions before 5.2.7, between 5.3.0 and 5.3.4, and between 5.4.0 and 5.4.3 of Atlassian Application Links.

Exploitation Mechanism

Attackers create an OAuth application link to a location they control and redirect access to internal resources.

Mitigation and Prevention

Immediate Steps to Take:

Update Atlassian Application Links to versions beyond the vulnerable ones.
Monitor network traffic for any suspicious activity. Long-Term Security Practices:
Regularly review and update security configurations.
Conduct security training for staff to recognize and report potential threats.
Implement network segmentation to limit access to critical resources.
Patching and Updates: Apply security patches and updates promptly to mitigate vulnerabilities.