CVE-2017-7293 : Security Advisory and Response

Dolby DAX2 and DAX3 API services have a vulnerability that allows privilege escalation, affecting various versions of Dolby Audio X2 and X3.

Understanding CVE-2017-7293

This CVE involves a privilege escalation vulnerability in Dolby DAX2 and DAX3 API services, potentially granting unauthorized system privileges.

What is CVE-2017-7293?

The Dolby DAX2 and DAX3 API services are susceptible to a privilege escalation flaw that enables a regular user to attain arbitrary system privileges. The issue stems from the utilization of .NET code for DCOM within these services. Affected versions include Dolby Audio X2 (DAX2) 1.0 to 1.4.4 and Dolby Audio X3 (DAX3) 1.0 and 1.1.

The Impact of CVE-2017-7293

The vulnerability allows a normal user to elevate their privileges and gain arbitrary system privileges, posing a significant security risk to affected systems. An example of an impacted driver is the Realtek Audio Driver 6.0.1.7898 on a Lenovo P50.

Technical Details of CVE-2017-7293

This section provides in-depth technical insights into the vulnerability.

Vulnerability Description

The flaw in Dolby DAX2 and DAX3 API services permits unauthorized users to escalate their privileges, potentially leading to the acquisition of arbitrary system privileges due to the presence of .NET code for DCOM.

Affected Systems and Versions

Dolby Audio X2 (DAX2) versions 1.0 to 1.4.4
Dolby Audio X3 (DAX3) versions 1.0 and 1.1

Exploitation Mechanism

The vulnerability arises from the use of .NET code for DCOM within the Dolby DAX2 and DAX3 API services, enabling unauthorized users to exploit the flaw and elevate their privileges.

Mitigation and Prevention

Protecting systems from CVE-2017-7293 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable or restrict access to the affected Dolby DAX2 and DAX3 API services where possible.
Monitor for any unauthorized system privilege escalations.

Long-Term Security Practices

Regularly update and patch Dolby Audio X2 and X3 to mitigate known vulnerabilities.
Implement least privilege access controls to limit the impact of potential privilege escalation attacks.

Patching and Updates

Apply security patches provided by Dolby for the affected versions to address the privilege escalation vulnerability effectively.