CVE-2021-43313 : Security Advisory and Response
Learn about the heap-based buffer overflow vulnerability in upx versions prior to 4.0.0-git-c6b9e3c62d15. Find mitigation steps and best practices for long-term security.
A heap-based buffer overflow vulnerability in upx could allow an attacker to trigger an issue in PackLinuxElf32::invert_pt_dynamic at p_lx_elf.cpp:1688.
Understanding CVE-2021-43313
What is CVE-2021-43313?
A heap-based buffer overflow was discovered in upx, where a variable 'bucket' points to an inaccessible address.
The Impact of CVE-2021-43313
The vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service on the affected system.
Technical Details of CVE-2021-43313
Vulnerability Description
The issue occurs in upx versions prior to 4.0.0-git-c6b9e3c62d15, allowing for a heap-based buffer overflow.
Affected Systems and Versions
- Vendor: n/a
- Product: upx
- Affected Version: upx before 4.0.0-git-c6b9e3c62d15
Exploitation Mechanism
The vulnerability can be exploited by an attacker to craft a special payload triggering the buffer overflow.
Mitigation and Prevention
Immediate Steps to Take
- Update upx to version 4.0.0-git-c6b9e3c62d15 or later.
- Monitor network traffic for any signs of exploitation.
Long-Term Security Practices
- Implement the principle of least privilege to limit access.
- Conduct regular security assessments and penetration testing.
Patching and Updates
Ensure timely installation of security patches and updates.