CVE-2020-27788 : Security Advisory and Response

An out-of-bounds read access vulnerability was discovered in UPX in PackLinuxElf64::canPack() function of p_lx_elf.cpp file. This could allow an attacker to trigger a crash, leading to a denial of service.

Understanding CVE-2020-27788

This CVE involves an out-of-bounds read vulnerability in UPX, potentially leading to a denial of service.

What is CVE-2020-27788?

UPX, a popular executable packer, was found to have a vulnerability in the PackLinuxElf64::canPack() function, allowing attackers to cause a denial of service by triggering a crash.

The Impact of CVE-2020-27788

The vulnerability could be exploited by an attacker with a crafted input file to crash the system, resulting in a denial of service.

Technical Details of CVE-2020-27788

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability exists in the PackLinuxElf64::canPack() function of the p_lx_elf.cpp file in UPX, enabling an out-of-bounds read access.

Affected Systems and Versions

Product: UPX
Version affected: Fixed in v3.96

Exploitation Mechanism

An attacker can exploit this vulnerability by providing a specially crafted input file to trigger the out-of-bounds read access, leading to a system crash.

Mitigation and Prevention

Protecting systems from CVE-2020-27788 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update UPX to version 3.96 to mitigate the vulnerability.
Avoid running UPX on untrusted or unknown files.

Long-Term Security Practices

Regularly update software and apply security patches.
Implement proper input validation to prevent similar vulnerabilities.
Conduct security audits and code reviews to identify and address potential issues.

Patching and Updates

Ensure that UPX is regularly updated to the latest version to patch known vulnerabilities and enhance security.