CVE-2021-36080 : What You Need to Know

GNU LibreDWG 0.12.3.4163 through 0.12.3.4191 is impacted by a double-free vulnerability in bit_chain_free, which is triggered from dwg_encode_MTEXT and dwg_encode_add_object functions.

Understanding CVE-2021-36080

This CVE involves a specific version range of GNU LibreDWG and a vulnerability in a particular function that can lead to a double-free condition.

What is CVE-2021-36080?

CVE-2021-36080 is a security vulnerability found in GNU LibreDWG versions 0.12.3.4163 through 0.12.3.4191. It occurs due to a double-free issue within the bit_chain_free function, which is called from dwg_encode_MTEXT and dwg_encode_add_object.

The Impact of CVE-2021-36080

This vulnerability could be exploited by an attacker to execute arbitrary code, cause a denial of service, or potentially gain unauthorized access to a system running the affected GNU LibreDWG versions.

Technical Details of CVE-2021-36080

Here are some key technical details related to CVE-2021-36080:

Vulnerability Description

The vulnerability is caused by a double-free issue in the bit_chain_free function, which is accessed through dwg_encode_MTEXT and dwg_encode_add_object functions.

Affected Systems and Versions

GNU LibreDWG versions 0.12.3.4163 through 0.12.3.4191 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a specific input that triggers the double-free condition, leading to potential security risks.

Mitigation and Prevention

To address CVE-2021-36080 and enhance the security of your systems, consider the following steps:

Immediate Steps to Take

Update GNU LibreDWG to a non-vulnerable version if available.
Monitor security advisories for patches or workarounds.
Restrict network access to vulnerable systems.

Long-Term Security Practices

Implement regular security updates and patches.
Conduct security assessments and code reviews.
Enhance developer training on secure coding practices.

Patching and Updates

Stay informed about security updates and patches released by GNU LibreDWG and apply them promptly to protect your systems from potential threats.