CVE-2018-8718: Cross-Site Request Forgery in Jenkins Mailer Plugin
Summary
CVE-2018-8718: Cross-Site Request Forgery in Jenkins Mailer Plugin. Affects org.jenkins-ci.plugins:mailer versions < 1.21. Fixed in 1.21. How to fix ↓
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Background
The Mailer Plugin is a component of Jenkins, an open-source automation server. It allows users to configure email notifications for various events within Jenkins. The plugin integrates with the Jenkins system, enabling users to send emails to specific recipients or groups when certain conditions are met. However, the Mailer Plugin version 1.20 for Jenkins 2.111 is vulnerable to a cross-site request forgery (CSRF) attack.
Vulnerability Detail
The Mailer Plugin 1.20 for Jenkins 2.111 is susceptible to a CSRF vulnerability, which allows remote authenticated users to send unauthorized mail as an arbitrary user. This vulnerability can be exploited by sending a specially crafted request to the '/descriptorByName/hudson.tasks.Mailer/sendTestMail' endpoint. As a result, an attacker with authenticated access can send emails on behalf of any user, potentially leading to unauthorized actions or information disclosure.
How To Fix
Minimum fixed version
1.21
This is the first release that contains the fix.
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Workaround
If upgrading to the latest version is not immediately feasible, users can implement a workaround by disabling the Mailer Plugin or restricting access to the '/descriptorByName/hudson.tasks.Mailer/sendTestMail' endpoint. This can be achieved by modifying the Jenkins configuration or using access control mechanisms such as firewall rules or network segmentation.
Conclusion
The Mailer Plugin 1.20 for Jenkins 2.111 is vulnerable to a CSRF attack, allowing authenticated users to send unauthorized emails on behalf of other users. To mitigate this vulnerability, it is crucial to upgrade to the latest version of the plugin (1.21 or later). Alternatively, users can implement workarounds such as disabling the plugin or restricting access to the vulnerable endpoint. It is recommended to apply the necessary fixes promptly to prevent potential misuse or unauthorized actions. For further support or assistance, contact DevNack.com.
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FAQ
The vulnerability allows authenticated users to send unauthorized emails on behalf of other users. This can lead to potential misuse of the email functionality, unauthorized actions, or information disclosure.
No, this vulnerability requires authenticated access to the Jenkins system. Remote exploitation is not possible unless an attacker has valid credentials.
Yes, upgrading to the latest version of the Mailer Plugin (1.21 or later) is the recommended mitigation. Additionally, restricting access to the vulnerable endpoint or disabling the plugin can provide temporary protection.
There is no specific evidence of active exploits targeting this vulnerability. However, it is advisable to apply the recommended fixes as soon as possible to prevent potential misuse.
For further support or assistance regarding vulnerability remediation, you can contact info@devnack.com. They can provide guidance and help in addressing the vulnerability in your Jenkins installation.
References
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