CVE-2021-38185 : What You Need to Know

A detailed overview of CVE-2021-38185 focusing on its impact, technical details, and mitigation strategies.

Understanding CVE-2021-38185

CVE-2021-38185 is a vulnerability found in GNU cpio through version 2.13 that allows attackers to execute arbitrary code through a crafted pattern file. The vulnerability arises from an integer overflow in dstring.c ds_fgetstr, leading to an out-of-bounds heap write.

What is CVE-2021-38185?

The CVE-2021-38185 vulnerability in GNU cpio enables malicious actors to trigger an out-of-bounds heap write, potentially allowing them to execute arbitrary code. The exploit revolves around a specific pattern file associated with the -E option.

The Impact of CVE-2021-38185

The impact of CVE-2021-38185 can be severe, as it permits attackers to run arbitrary code on affected systems. This could result in unauthorized access, data theft, or further compromise of the system's integrity.

Technical Details of CVE-2021-38185

A deeper dive into the specifics of the vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability stems from an integer overflow in dstring.c ds_fgetstr, triggering an out-of-bounds heap write when processing a maliciously crafted pattern file.

Affected Systems and Versions

All versions of GNU cpio up to 2.13 are affected by CVE-2021-38185. This includes systems utilizing the vulnerable pattern file functionality associated with the -E option.

Exploitation Mechanism

Attackers can exploit CVE-2021-38185 by providing a specially crafted pattern file to the affected GNU cpio utility, causing the integer overflow and subsequent out-of-bounds write.

Mitigation and Prevention

Best practices to mitigate the risk posed by CVE-2021-38185, including immediate steps and long-term security measures.

Immediate Steps to Take

Users are advised to update GNU cpio to a patched version that addresses the vulnerability. Additionally, avoid processing untrusted pattern files through the -E option.

Long-Term Security Practices

Implement strict input validation mechanisms and perform regular security audits to identify and address potential vulnerabilities in software dependencies.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the software vendor to safeguard systems from known vulnerabilities.