CVE-2021-3700 : What You Need to Know

A detailed overview of the use-after-free vulnerability found in usbredir versions prior to 0.11.0 and its impact.

Understanding CVE-2021-3700

This section outlines the vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-3700?

CVE-2021-3700 is a use-after-free vulnerability discovered in usbredir versions before 0.11.0. The vulnerability exists in the usbredirparser_serialize() function within usbredirparser/usbredirparser.c. It arises when serializing large amounts of buffered write data under specific conditions.

The Impact of CVE-2021-3700

This vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service (DoS) condition by manipulating the serialization process of buffered write data.

Technical Details of CVE-2021-3700

In this section, we delve into the specifics of the vulnerability, the affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The use-after-free flaw in usbredir versions prior to 0.11.0 allows attackers to manipulate the serialization of buffered write data, potentially leading to arbitrary code execution or a DoS scenario.

Affected Systems and Versions

The vulnerability impacts usbredir versions earlier than 0.11.0, exposing systems to exploitation if not promptly addressed.

Exploitation Mechanism

Attackers can exploit this vulnerability by triggering the use-after-free condition, enabling them to control the serialization of buffered write data and launch malicious activities.

Mitigation and Prevention

This section focuses on the steps to mitigate the risks posed by CVE-2021-3700 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to update usbredir to version 0.11.0 or newer to eliminate the use-after-free vulnerability and enhance system security.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and staying informed about software updates are essential for long-term security.

Patching and Updates

Regularly applying patches and updates provided by usbredir and related software vendors is crucial to address known vulnerabilities and strengthen system defenses.