CVE-2019-20805 : What You Need to Know

An integer overflow vulnerability was discovered in the p_lx_elf.cpp file in versions of UPX prior to 3.96. This vulnerability occurs when unpacking files containing specifically crafted values in a PT_DYNAMIC segment.

Understanding CVE-2019-20805

This CVE-2019-20805 vulnerability affects UPX versions before 3.96, leading to an integer overflow issue during the unpacking process.

What is CVE-2019-20805?

The vulnerability arises from unpacking files with maliciously crafted values in a specific segment, potentially allowing attackers to execute arbitrary code or cause a denial of service.

The Impact of CVE-2019-20805

The exploitation of this vulnerability could result in remote code execution or a denial of service attack, posing a significant threat to the security and integrity of affected systems.

Technical Details of CVE-2019-20805

This section provides detailed technical information about the CVE-2019-20805 vulnerability.

Vulnerability Description

The vulnerability exists in the p_lx_elf.cpp file of UPX versions prior to 3.96, where an integer overflow occurs during the unpacking process when handling specially crafted values within a PT_DYNAMIC segment.

Affected Systems and Versions

UPX versions before 3.96 are vulnerable to this integer overflow issue.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious values in a PT_DYNAMIC segment of files, triggering the integer overflow during the unpacking process.

Mitigation and Prevention

Protecting systems from CVE-2019-20805 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update UPX to version 3.96 or newer to mitigate the vulnerability.
Exercise caution when unpacking files from untrusted sources.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement robust security measures such as network segmentation and access controls.
Conduct regular security audits and vulnerability assessments.

Patching and Updates

Ensure that UPX is regularly updated to the latest version to address security vulnerabilities and protect systems from potential exploits.