CVE-2018-20623 : Security Advisory and Response

A use-after-free vulnerability was identified in the error function within the elfcomm.c file of GNU Binutils version 2.31.1. This vulnerability occurs when the error function is called from the process_archive function within the readelf.c file, specifically when processing a maliciously crafted ELF file.

Understanding CVE-2018-20623

This CVE entry describes a specific vulnerability in GNU Binutils version 2.31.1.

What is CVE-2018-20623?

CVE-2018-20623 is a use-after-free vulnerability found in the error function of GNU Binutils version 2.31.1, triggered when processing a specially crafted ELF file.

The Impact of CVE-2018-20623

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by exploiting the use-after-free issue in GNU Binutils.

Technical Details of CVE-2018-20623

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability exists in the error function within the elfcomm.c file of GNU Binutils version 2.31.1, specifically when called from the process_archive function in readelf.c while handling a malicious ELF file.

Affected Systems and Versions

Affected Version: GNU Binutils 2.31.1
Systems using this specific version are vulnerable to exploitation.

Exploitation Mechanism

Exploitation involves crafting a malicious ELF file to trigger the use-after-free vulnerability in the error function.

Mitigation and Prevention

Protecting systems from CVE-2018-20623 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update GNU Binutils to a patched version that addresses the use-after-free vulnerability.
Implement strict file validation checks to prevent the processing of malicious ELF files.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security audits and code reviews to identify and mitigate similar vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates from GNU Binutils and related vendors.
Apply patches and updates as soon as they are available to ensure system security.