CVE-2017-1000373 : Security Advisory and Response

OpenBSD qsort() function vulnerability allows for arbitrary code execution due to a deterministic recursion issue.

Understanding CVE-2017-1000373

The vulnerability in the qsort() function of OpenBSD can be exploited to execute arbitrary code by manipulating stack memory.

What is CVE-2017-1000373?

The recursive function qsort() in OpenBSD is not randomized, enabling attackers to manipulate stack memory for arbitrary code execution attacks.

The Impact of CVE-2017-1000373

Attackers can create specific input arrays to cause excessive stack memory usage and execute arbitrary code.
The vulnerability affects OpenBSD 6.1 and potentially earlier versions.

Technical Details of CVE-2017-1000373

The technical aspects of the vulnerability in the OpenBSD qsort() function.

Vulnerability Description

The qsort() function in OpenBSD is recursive and not randomized, allowing attackers to manipulate stack memory.

Affected Systems and Versions

OpenBSD 6.1 and potentially earlier versions are impacted by this vulnerability.

Exploitation Mechanism

Attackers can construct input arrays to cause deterministic recursion in qsort(), leading to excessive stack memory usage.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2017-1000373.

Immediate Steps to Take

Apply patches provided by OpenBSD to address the qsort() vulnerability.
Monitor for any unusual stack memory consumption.

Long-Term Security Practices

Regularly update OpenBSD systems to the latest versions to prevent known vulnerabilities.

Patching and Updates

Stay informed about security advisories from OpenBSD and apply patches promptly to secure systems.