CVE-2017-6209 : Exploit Details and Defense Strategies

A stack-based buffer overflow vulnerability in virglrenderer before version 0.6.0 could allow local guest OS users to trigger a denial of service attack.

Understanding CVE-2017-6209

This CVE involves a vulnerability in the parse_identifier function within the TGSI auxiliary module in the Gallium driver of virglrenderer.

What is CVE-2017-6209?

The parse_identifier function in virglrenderer before version 0.6.0 is prone to a stack-based buffer overflow, potentially leading to a denial of service condition when exploited by local guest OS users. The vulnerability arises from improper handling of certain vectors related to property parsing.

The Impact of CVE-2017-6209

Exploitation of this vulnerability could result in a denial of service, causing an out-of-bounds array access and crashing of the QEMU process. Attackers with local guest OS access could potentially leverage this flaw to disrupt system operations.

Technical Details of CVE-2017-6209

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability lies in the parse_identifier function in tgsi_text.c within the TGSI auxiliary module of the Gallium driver in virglrenderer before version 0.6.0.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions before 0.6.0

Exploitation Mechanism

The vulnerability can be exploited by local guest OS users through vectors related to property parsing, leading to a stack-based buffer overflow.

Mitigation and Prevention

Protective measures and actions to mitigate the risks associated with CVE-2017-6209.

Immediate Steps to Take

Apply the necessary patches and updates provided by the vendor.
Monitor vendor advisories and security mailing lists for any further updates.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Regularly update and patch software to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Ensure that virglrenderer is updated to version 0.6.0 or later to mitigate the stack-based buffer overflow vulnerability.