CVE-2019-19945 : What You Need to Know

An integer signedness error in uhttpd component of OpenWrt versions 18.06.5 and 19.x through 19.07.0-rc2 allows for heap buffer access beyond boundaries, leading to a crash when exploited through an HTTP POST request.

Understanding CVE-2019-19945

This CVE involves an integer signedness error in uhttpd, impacting specific versions of OpenWrt.

What is CVE-2019-19945?

This CVE identifies a vulnerability in OpenWrt versions 18.06.5 and 19.x through 19.07.0-rc2, allowing attackers to trigger a crash by exploiting a heap buffer access issue.

The Impact of CVE-2019-19945

The vulnerability enables attackers to crash the system by sending a malicious HTTP POST request to a CGI script, potentially leading to denial of service.

Technical Details of CVE-2019-19945

This section delves into the technical aspects of the CVE.

Vulnerability Description

The flaw in uhttpd allows for out-of-bounds access to a heap buffer, resulting in a crash when a specific HTTP POST request is made to a CGI script.

Affected Systems and Versions

OpenWrt versions 18.06.5 and 19.x through 19.07.0-rc2

Exploitation Mechanism

Attackers can exploit the vulnerability by sending an HTTP POST request to a CGI script with specific headers and content length values.

Mitigation and Prevention

Protecting systems from CVE-2019-19945 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by OpenWrt promptly.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories from OpenWrt and apply patches as soon as they are released.