CVE-2019-11838 : Security Advisory and Response

NGINX njs through version 0.3.1 is susceptible to a heap-based buffer overflow in Array.prototype.splice function.

Understanding CVE-2019-11838

This CVE involves a vulnerability in NGINX njs that can lead to a heap-based buffer overflow.

What is CVE-2019-11838?

NGINX njs up to version 0.3.1 is affected by a heap-based buffer overflow in the Array.prototype.splice function after a resize operation. The vulnerability is due to mishandling the size parameter in the njs_array_expand function.

The Impact of CVE-2019-11838

The vulnerability can be exploited to execute arbitrary code or cause a denial of service (DoS) condition.

Technical Details of CVE-2019-11838

NGINX njs through version 0.3.1 is affected by this vulnerability.

Vulnerability Description

A heap-based buffer overflow occurs in the Array.prototype.splice function after a resize operation in NGINX njs, specifically in the njs_array_prototype_splice function in the njs/njs_array.c file.

Affected Systems and Versions

NGINX njs up to version 0.3.1

Exploitation Mechanism

The vulnerability is exploited by mishandling the size parameter in the njs_array_expand function.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-11838.

Immediate Steps to Take

Update NGINX njs to a version that includes a patch for this vulnerability.
Monitor for any unusual activities on the affected systems.

Long-Term Security Practices

Regularly update software and apply patches promptly.
Conduct security assessments and audits to identify and mitigate vulnerabilities.

Patching and Updates

Ensure that NGINX njs is regularly updated to the latest secure version.