CVE-2019-20021 Explained : Impact and Mitigation

A vulnerability involving excessive reading of a heap-based buffer was found in the function canUnpack located in the file p_mach.cpp within the UPX version 3.95. This vulnerability can be exploited by using a specially crafted Mach-O file.

Understanding CVE-2019-20021

This CVE involves a heap-based buffer over-read in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

What is CVE-2019-20021?

The vulnerability is related to excessive reading of a heap-based buffer in the function canUnpack in the file p_mach.cpp within UPX version 3.95.
It can be exploited by utilizing a specially crafted Mach-O file.

The Impact of CVE-2019-20021

Attackers can potentially exploit this vulnerability to execute arbitrary code or cause a denial of service on affected systems.

Technical Details of CVE-2019-20021

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability involves a heap-based buffer over-read in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

Affected Systems and Versions

UPX version 3.95 is affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by using a specially crafted Mach-O file.

Mitigation and Prevention

Learn how to mitigate and prevent the exploitation of CVE-2019-20021.

Immediate Steps to Take

Update UPX to a patched version that addresses the vulnerability.
Avoid opening or executing untrusted Mach-O files.

Long-Term Security Practices

Regularly update software and apply security patches.
Implement network and system monitoring to detect unusual behavior.

Patching and Updates

Stay informed about security advisories and updates from UPX.