CVE-2020-1917 : Vulnerability Insights and Analysis

HHVM versions prior to 4.56.3, between 4.57.0 and 4.80.1, between 4.81.0 and 4.93.1, and 4.94.0 to 4.98.0 are affected by a Heap-based Buffer Overflow vulnerability.

Understanding CVE-2020-1917

What is CVE-2020-1917?

The vulnerability in HHVM (HipHop Virtual Machine) versions allowed an out-of-bounds write due to a missing standard append char function.

The Impact of CVE-2020-1917

This vulnerability could be exploited to execute arbitrary code or cause a denial of service by malicious actors.

Technical Details of CVE-2020-1917

Vulnerability Description

The xbuf_format_converter in HHVM was not correctly handling buffer size leading to a heap-based buffer overflow.

Affected Systems and Versions

HHVM versions prior to 4.56.3
HHVM versions between 4.57.0 and 4.80.1
HHVM versions between 4.81.0 and 4.93.1
HHVM versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0

Exploitation Mechanism

Attackers could craft a malicious input triggering the buffer overflow, potentially leading to code execution or denial of service.

Mitigation and Prevention

Immediate Steps to Take

Patch HHVM to the latest version immediately.
Monitor for any signs of unusual activities on the system.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Conduct security assessments to identify and mitigate risks proactively.

Patching and Updates

Apply all relevant security patches and updates provided by HHVM.