CVE-2020-35448 : Security Advisory and Response

An issue was discovered in the Binary File Descriptor (BFD) library (aka libbfd), as distributed in GNU Binutils 2.35.1. This vulnerability can lead to a heap-based buffer over-read in certain functions, potentially allowing attackers to execute arbitrary code or cause a denial of service.

Understanding CVE-2020-35448

This CVE identifies a specific vulnerability in the BFD library of GNU Binutils version 2.35.1.

What is CVE-2020-35448?

The vulnerability in the Binary File Descriptor (BFD) library can result in a heap-based buffer over-read due to inadequate validation of certain parameters in the code.

The Impact of CVE-2020-35448

The exploitation of this vulnerability could allow malicious actors to trigger a buffer over-read, leading to potential information disclosure, denial of service, or even arbitrary code execution on the affected system.

Technical Details of CVE-2020-35448

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from a lack of validation for the 'sh_entsize' parameter in the '_bfd_elf_slurp_secondary_reloc_section' function within the 'libbfd.c' file.

Affected Systems and Versions

Product: GNU Binutils
Version: 2.35.1
Vendor: GNU

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious file or input that triggers the specific code path, leading to the buffer over-read.

Mitigation and Prevention

Protecting systems from CVE-2020-35448 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to address the vulnerability.
Monitor security advisories for any new information or mitigations.

Long-Term Security Practices

Regularly update software and libraries to ensure the latest security fixes are in place.
Implement strong input validation mechanisms to prevent buffer over-read vulnerabilities.

Patching and Updates

Check for patches or updates provided by GNU Binutils to fix the vulnerability.
Follow best practices for secure coding and regularly review and update code for potential vulnerabilities.