CVE-2018-5548 : Security Advisory and Response

CVE-2018-5548, published on September 12, 2018, addresses a security vulnerability in BIG-IP APM versions 11.6.0-11.6.3 that allows malicious users to exploit an insecure AES ECB mode.

Understanding CVE-2018-5548

This CVE entry highlights a specific vulnerability in the BIG-IP APM software by F5 Networks, Inc.

What is CVE-2018-5548?

The vulnerability involves the use of an insecure AES ECB mode in the orig_uri parameter of a /vdesk link within an APM virtual server configured with an access profile. This flaw enables a malicious actor to create a redirect URI value using different cipher text blocks.

The Impact of CVE-2018-5548

The exploitation of this vulnerability could lead to cross-site scripting (XSS) attacks, potentially compromising the security and integrity of the affected systems.

Technical Details of CVE-2018-5548

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from the utilization of an insecure AES ECB mode in the orig_uri parameter of a specific /vdesk link within the APM virtual server.

Affected Systems and Versions

Product: BIG-IP APM
Vendor: F5 Networks, Inc.
Versions: 11.6.0-11.6.3

Exploitation Mechanism

By manipulating distinct blocks of cipher texts in the orig_uri parameter, a malicious user can construct a redirect URI value, potentially leading to security breaches.

Mitigation and Prevention

In response to CVE-2018-5548, it is crucial to implement immediate steps and adopt long-term security practices to mitigate risks and enhance system security.

Immediate Steps to Take

Apply patches or updates provided by F5 Networks, Inc. to address the vulnerability promptly.
Monitor and restrict access to potentially vulnerable components within the APM virtual server.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities from being exploited.
Conduct security assessments and audits to identify and address potential security weaknesses.

Patching and Updates

Regularly check for security advisories and updates from F5 Networks, Inc. to ensure that the software is up-to-date and protected against known vulnerabilities.