Critical · published January 29, 2018
CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 100.0th percentile for exploit probability.
🚨 Imagine a world where anyone can sneak in and take control of your Jenkins server without needing a key! This unauthenticated remote code execution vulnerability affects Jenkins versions 2.56 and earlier, as well as 2.46.1 LTS and earlier. 🔥 Think of Jenkins as a high-security hotel. This vulnerability is like someone being able to check in without a reservation, bypassing security checks entirely, and they can do whatever they want once inside! An attacker could gain complete control of your Jenkins instance, potentially executing arbitrary commands, reading sensitive data, or even altering configurations or code. It's an absolutely devastating flaw that could lead to severe breaches if left unpatched!
Think of Jenkins as a high-security hotel. This vulnerability is like someone being able to check in without a reservation, bypassing security checks entirely, and they can do whatever they want once inside! This CVE allows attackers to transfer a crafted serialized Java `SignedObject` to the Jenkins CLI, which the server deserializes without proper checks, bypassing existing protections. By adding `SignedObject` to the blacklist and deprecating the insecure protocol, the vulnerability will be mitigated.
An attacker could gain complete control of your Jenkins instance, potentially executing arbitrary commands, reading sensitive data, or even altering configurations or code. It's an absolutely devastating flaw that could lead to severe breaches if left unpatched! Immediately upgrade Jenkins to version 2.46.2 or higher, or ensure you're running versions 2.56 and above. Disable the remoting-based CLI protocol and adopt the new HTTP CLI for better security. Review your configurations to ensure no untrusted commands are executed! You can fix this! Follow the steps, and you'll have your Jenkins environment secure in no time. 🛡️