CVE-2023-27900 : What You Need to Know

This article provides detailed information on CVE-2023-27900, a vulnerability identified in Jenkins software.

Understanding CVE-2023-27900

This section delves into the specifics of CVE-2023-27900, focusing on the vulnerability, its impacts, technical details, and mitigation strategies.

What is CVE-2023-27900?

CVE-2023-27900 affects Jenkins versions 2.393 and earlier, as well as LTS 2.375.3 and earlier. The vulnerability arises from the use of the Apache Commons FileUpload library without setting limits for the number of request parts in hudson.util.MultipartFormDataParser.

The Impact of CVE-2023-27900

Unmitigated, CVE-2023-27900 allows attackers to launch denial-of-service attacks by exploiting the lack of constraints on request parts. This vulnerability poses a significant threat to the availability and functionality of Jenkins instances.

Technical Details of CVE-2023-27900

This section covers the technical aspects of CVE-2023-27900, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability in Jenkins stems from the inadequate configuration of the Apache Commons FileUpload library, leading to potential denial-of-service attacks through excessive request parts.

Affected Systems and Versions

Jenkins versions 2.393 and below, along with LTS 2.375.3 and prior, are susceptible to CVE-2023-27900. Versions 2.394, 2.375.4, and 2.387.1 have been identified as unaffected by this vulnerability.

Exploitation Mechanism

Attackers can exploit CVE-2023-27900 by sending an excessive number of request parts to the affected Jenkins instances, triggering a denial-of-service condition.

Mitigation and Prevention

In this section, strategies to mitigate and prevent the exploitation of CVE-2023-27900 are outlined, focusing on immediate actions and long-term security practices.

Immediate Steps to Take

Jenkins administrators should consider implementing filters or constraints on the number of request parts permitted, enhancing security measures to mitigate the risk posed by CVE-2023-27900.

Long-Term Security Practices

Adopting a proactive security posture, staying informed about software vulnerabilities, and conducting regular security assessments are essential for safeguarding Jenkins instances against potential threats like CVE-2023-27900.

Patching and Updates

Staying current with Jenkins software updates, especially patches addressing CVE-2023-27900, is crucial. Applying relevant security patches promptly can help prevent exploitation and ensure the ongoing security of Jenkins deployments.