CVE-2020-27801 Explained : Impact and Mitigation
Learn about CVE-2020-27801, a heap-based buffer over-read vulnerability in UPX 4.0.0 that could allow attackers to execute arbitrary code or cause a denial of service (DoS) condition. Find out how to mitigate the risk and protect your systems.
A heap-based buffer over-read vulnerability was discovered in UPX 4.0.0, allowing attackers to exploit it via a crafted Mach-O file.
Understanding CVE-2020-27801
This CVE involves a heap-based buffer over-read vulnerability in UPX 4.0.0.
What is CVE-2020-27801?
The vulnerability in the get_le64 function in bele.h in UPX 4.0.0 allows for a heap-based buffer over-read when processing a specially crafted Mach-O file.
The Impact of CVE-2020-27801
This vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service (DoS) condition on the affected system.
Technical Details of CVE-2020-27801
This section provides technical details about the vulnerability.
Vulnerability Description
A heap-based buffer over-read was found in the get_le64 function in bele.h in UPX 4.0.0 when handling a malicious Mach-O file.
Affected Systems and Versions
- Product: UPX
- Version: upx 4.0.0-git-87b73e5cfdc1+
Exploitation Mechanism
The vulnerability can be exploited by an attacker through a specially crafted Mach-O file.
Mitigation and Prevention
Protecting systems from CVE-2020-27801 requires immediate action and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the vendor promptly.
- Avoid opening untrusted Mach-O files.
Long-Term Security Practices
- Regularly update software and security patches.
- Implement network segmentation to limit the impact of potential attacks.
- Conduct regular security assessments and audits.
Patching and Updates
Ensure that UPX is updated to a non-vulnerable version to mitigate the risk of exploitation.