CVE-2021-40143 : Security Advisory and Response

Sonatype Nexus Repository 3.x through 3.33.1-01 is vulnerable to an HTTP header injection, potentially leading to the disclosure of sensitive information or enabling remote attackers to request external resources.

Understanding CVE-2021-40143

Sonatype Nexus Repository version 3.x through 3.33.1-01 is susceptible to an HTTP header injection vulnerability that could be exploited by remote attackers.

What is CVE-2021-40143?

The CVE-2021-40143 vulnerability affects Sonatype Nexus Repository versions from 3.x through 3.33.1-01, allowing attackers to carry out HTTP header injections by sending malicious requests.

The Impact of CVE-2021-40143

The vulnerability may result in the exposure of sensitive data and enable attackers to trigger requests for external resources from a compromised instance of Nexus Repository.

Technical Details of CVE-2021-40143

CVE-2021-40143 presents the following technical details:

Vulnerability Description

Type: HTTP header injection
Severity: Medium
CVSS Score: N/A
Attack Vector: Remote

Affected Systems and Versions

Sonatype Nexus Repository 3.x through 3.33.1-01

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted HTTP requests to compromise instances of Nexus Repository.

Mitigation and Prevention

It is crucial to take immediate and long-term security measures to address CVE-2021-40143.

Immediate Steps to Take

Upgrade Nexus Repository to a non-vulnerable version.
Implement firewall rules to filter out malicious HTTP requests.
Monitor network traffic for any unusual patterns.

Long-Term Security Practices

Regularly update and patch Sonatype Nexus Repository.
Conduct security audits and penetration testing to identify vulnerabilities.
Educate users on secure coding practices to prevent future injection attacks.

Patching and Updates

Stay informed about security patches released by Sonatype for Nexus Repository.
Apply patches promptly to keep systems secure.