CVE-2020-24370 : What You Need to Know

CVE-2020-24370 is a vulnerability in Lua 5.4.0 that allows a negation overflow and segmentation fault in getlocal and setlocal functions.

Understanding CVE-2020-24370

What is CVE-2020-24370?

This CVE refers to a specific issue in Lua 5.4.0 that can lead to a negation overflow and segmentation fault when certain functions are called.

The Impact of CVE-2020-24370

This vulnerability can potentially be exploited to cause a denial of service or execute arbitrary code on systems running the affected version of Lua.

Technical Details of CVE-2020-24370

Vulnerability Description

The issue occurs in the ldebug.c file in Lua 5.4.0, specifically in the getlocal and setlocal functions, where a negation overflow can trigger a segmentation fault, as demonstrated by getlocal(3,2^31).

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: Lua 5.4.0

Exploitation Mechanism

The vulnerability can be exploited by calling the getlocal or setlocal functions with specific parameters that trigger the negation overflow and subsequent segmentation fault.

Mitigation and Prevention

Immediate Steps to Take

Update Lua to a patched version that addresses the CVE.
Monitor official sources for security advisories related to Lua.

Long-Term Security Practices

Regularly update software and libraries to patched versions.
Implement secure coding practices to prevent similar vulnerabilities.

Patching and Updates

Apply patches provided by Lua maintainers to fix the vulnerability and prevent potential exploitation.