Jenkins Open User Registration Scanner
This scanner detects the use of Jenkins Open User Registration in digital assets. Open User Registration allows unauthorized registration of new users, potentially leading to unauthorized access. It is crucial to identify and secure systems with open registration to prevent exploitation.
Short Info
Level
Medium
Single Scan
Single Scan
Can be used by
Asset Owner
Estimated Time
10 seconds
Time Interval
18 days 23 hours
Scan only one
URL
Toolbox
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The Jenkins software is widely used by development teams and organizations to automate various tasks related to building, testing, and deploying software. It is a popular tool in the continuous integration and delivery (CI/CD) process, helping teams to ensure their software is reliable and of high quality. Jenkins is often used by software developers, DevOps engineers, and IT administrators to streamline the software development lifecycle. The platform is valued for its robust plugin architecture and ability to support multiple programming languages. By automating repetitive tasks, Jenkins helps to increase productivity and reduce errors in software projects. However, this critical tool can also be a target for security vulnerabilities if not properly configured.
The Open User Registration vulnerability in Jenkins allows an attacker to register a new account on a Jenkins server without prior authorization. This creates a risk as unauthorized users may gain access to the Jenkins dashboard, where they can view or potentially modify ongoing projects. This vulnerability is often a result of default or misconfigured settings that permit open registration by any user. While open registration can be beneficial for ease of access in collaborative environments, it poses a significant security risk if not properly controlled. As a detection template, the scanner identifies instances of this vulnerability to alert administrators to unnecessary exposure.
In technical terms, the vulnerability exploits Jenkins' sign-up endpoint, which is typically located at "/signup". When this endpoint is accessible and improperly configured, it can allow users to create accounts without administrative consent. The HTTP response indicating a successful registration will include a "Create an account! [Jenkins]" message in the body and a status code of 200, confirming the flaw. The detection process involves sending GET requests to the endpoint and checking for specific markers in the response headers and body content. This method ensures that any instances of open registration are quickly identified and reported.
Exploiting this vulnerability can lead to unauthorized access to the Jenkins dashboard, potentially compromising not just the build environment, but also sensitive information contained in the projects managed by Jenkins. Malicious actors could deploy unauthorized builds, inject malicious code, or exfiltrate sensitive environmental data. Left unaddressed, such breaches might lead to broader organizational risk, as attackers could pivot to other systems based on gained insights from the compromised Jenkins environment.
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