CVE-2020-27799 : Exploit Details and Defense Strategies

A heap-based buffer over-read vulnerability was found in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Understanding CVE-2020-27799

This CVE involves a specific vulnerability in the UPX software.

What is CVE-2020-27799?

The vulnerability is a heap-based buffer over-read in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 when processing a specially crafted Mach-O file.

The Impact of CVE-2020-27799

The vulnerability could potentially allow an attacker to execute arbitrary code or cause a denial of service by exploiting the buffer over-read issue.

Technical Details of CVE-2020-27799

This section provides more technical insights into the CVE.

Vulnerability Description

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted 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 this vulnerability is crucial.

Immediate Steps to Take

Apply the latest security patches provided by the vendor.
Avoid opening or executing files from untrusted or unknown sources.
Monitor security mailing lists for any updates related to this vulnerability.

Long-Term Security Practices

Regularly update and patch software to the latest versions.
Implement network and host-based intrusion detection/prevention systems.
Conduct regular security audits and penetration testing.

Patching and Updates

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