CVE-2020-27800 : What You Need to Know

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-2020-27800

This CVE identifies a specific vulnerability in UPX 4.0.0 that could be exploited by malicious actors.

What is CVE-2020-27800?

The vulnerability involves a heap-based buffer over-read in the get_le32 function in bele.h in UPX 4.0.0 when processing a specially crafted Mach-O file.

The Impact of CVE-2020-27800

Exploitation of this vulnerability could lead to information disclosure or potentially arbitrary code execution on the affected system.

Technical Details of CVE-2020-27800

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

A heap-based buffer over-read was found in the get_le32 function in bele.h in UPX 4.0.0 when handling a manipulated Mach-O file.

Affected Systems and Versions

Product: UPX
Version: UPX 4.0.0-git-87b73e5cfdc1+

Exploitation Mechanism

Attackers can exploit this vulnerability by enticing a user to open a malicious Mach-O file, triggering the buffer over-read.

Mitigation and Prevention

Protecting systems from CVE-2020-27800 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Avoid opening files from untrusted or unknown sources.
Implement file type and content validation mechanisms.

Long-Term Security Practices

Regularly update software and security tools.
Conduct security training for users on identifying phishing attempts.

Patching and Updates

Ensure that the affected UPX version is updated to a secure version that addresses the heap-based buffer over-read vulnerability.