CVE-2020-15889 : Exploit Details and Defense Strategies
Learn about CVE-2020-15889 affecting Lua 5.4.0, allowing a heap-based buffer over-read due to insufficient list member handling. Find mitigation steps and update recommendations here.
Lua 5.4.0 has a heap-based buffer over-read vulnerability due to insufficient list member handling in youngcollection in lgc.c.
Understanding CVE-2020-15889
What is CVE-2020-15889?
The vulnerability in Lua 5.4.0 allows for a heap-based buffer over-read when youngcollection in lgc.c uses markold inadequately.
The Impact of CVE-2020-15889
This vulnerability could be exploited by an attacker to read sensitive information from the heap, potentially leading to information disclosure.
Technical Details of CVE-2020-15889
Vulnerability Description
The issue arises from Lua 5.4.0's youngcollection in lgc.c not properly marking old list members, causing a heap-based buffer over-read.
Affected Systems and Versions
- Product: Lua
- Version: 5.4.0
Exploitation Mechanism
- Attackers can exploit this vulnerability to read beyond the allocated memory, potentially accessing sensitive data.
Mitigation and Prevention
Immediate Steps to Take
- Update Lua to version 5.4.1 or later to mitigate the vulnerability.
- Monitor official Lua channels for security advisories and patches.
Long-Term Security Practices
- Regularly update software and libraries to the latest versions.
- Implement secure coding practices to prevent buffer over-read vulnerabilities.
Patching and Updates
- Apply patches provided by Lua promptly to address security issues.