CVE-2022-28805 : What You Need to Know

Lua from version 5.4.0 up to 5.4.4 is impacted by a heap-based buffer over-read vulnerability due to a missing luaK_exp2anyregup call in singlevar in lparser.c. This vulnerability could be exploited by compiling untrusted Lua code, potentially leading to security risks.

Understanding CVE-2022-28805

Lua versions between 5.4.0 and 5.4.4 are susceptible to a heap-based buffer over-read vulnerability when processing untrusted Lua code.

What is CVE-2022-28805?

The CVE-2022-28805 vulnerability in Lua versions 5.4.0 to 5.4.4 is caused by a missing luaK_exp2anyregup call in singlevar in lparser.c. This flaw can result in a heap-based buffer over-read, allowing attackers to exploit systems running affected Lua versions.

The Impact of CVE-2022-28805

The impact of CVE-2022-28805 includes the potential for malicious actors to trigger a heap-based buffer over-read through the compilation of untrusted Lua code. This could lead to information disclosure or other security compromises.

Technical Details of CVE-2022-28805

The technical details of CVE-2022-28805 encompass the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises from the absence of a critical call in the Lua code, resulting in a heap-based buffer over-read when handling certain inputs.

Affected Systems and Versions

All Lua versions from 5.4.0 up to 5.4.4 are affected by this vulnerability. Systems running these versions are at risk of exploitation if processing untrusted Lua code.

Exploitation Mechanism

The exploitation of CVE-2022-28805 involves crafting malicious Lua code to trigger the heap-based buffer over-read condition, potentially enabling unauthorized access or data leakage.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-28805, it is essential to take immediate steps and adopt long-term security practices.

Immediate Steps to Take

Immediate steps to protect systems involve applying patches or updates released by the Lua project to address the heap-based buffer over-read vulnerability.

Long-Term Security Practices

In the long term, organizations should implement secure coding practices, conduct regular security assessments, and stay informed about the latest Lua security advisories.

Patching and Updates

Ensuring that systems are up to date with the latest Lua patches and updates is crucial for addressing CVE-2022-28805 and other potential vulnerabilities.