CVE-2018-18605 : What You Need to Know

The Binary File Descriptor (BFD) library, known as libbfd, contains a vulnerability in the sec_merge_hash_lookup function in merge.c, leading to a heap-based buffer over-read issue. This CVE affects GNU Binutils version 2.31 and can be exploited remotely using a specially crafted ELF file, resulting in a denial of service.

Understanding CVE-2018-18605

This CVE involves a specific vulnerability in the Binary File Descriptor (BFD) library that can be exploited to cause a denial of service.

What is CVE-2018-18605?

The vulnerability in the sec_merge_hash_lookup function in merge.c within the BFD library allows for a heap-based buffer over-read issue. It arises due to mishandling section merges in the _bfd_add_merge_section function when the size is not a multiple of entsize. Attackers can exploit this flaw remotely using a specially crafted ELF file, potentially leading to a denial of service.

The Impact of CVE-2018-18605

The impact of this vulnerability is the potential for remote attackers to exploit the issue, causing a denial of service by utilizing a specially crafted ELF file. The vulnerability has been demonstrated using the ld tool.

Technical Details of CVE-2018-18605

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability is a heap-based buffer over-read issue in the sec_merge_hash_lookup function in merge.c within the BFD library, affecting GNU Binutils version 2.31. It occurs due to mishandling section merges in the _bfd_add_merge_section function when the size is not a multiple of entsize.

Affected Systems and Versions

Affected System: GNU Binutils version 2.31
Affected Function: sec_merge_hash_lookup in merge.c

Exploitation Mechanism

Attackers can exploit this vulnerability remotely by using a specially crafted ELF file. The issue lies in the mishandling of section merges in the _bfd_add_merge_section function when the size is not a multiple of entsize.

Mitigation and Prevention

To address CVE-2018-18605, follow these mitigation strategies:

Immediate Steps to Take

Apply the latest security patches provided by the vendor.
Monitor security advisories for any updates related to this vulnerability.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement network security measures to detect and block malicious activities.

Patching and Updates

Ensure Binutils version 2.31 is updated to the latest version to mitigate the vulnerability effectively.