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Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an unauthenticated remote code execution. An unauthenticated remote code execution vulnerability allowed attackers to transfer a serialized Java `SignedObject` object to the Jenkins CLI, that would be deserialized using a new `ObjectInputStream`, bypassing the existing blacklist-based protection mechanism. We're fixing this issue by adding `SignedObject` to the blacklist. We're also backporting the new HTTP CLI protocol from Jenkins 2.54 to LTS 2.46.2, and deprecating the remoting-based (i.e. Java serialization) CLI protocol, disabling it by default.

• https://www.exploit-db.com/exploits/41965/ exploitx_refsource_EXPLOIT-DB
• http://www.securityfocus.com/bid/98056 vdb-entryx_refsource_BID
• https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
• https://jenkins.io/security/advisory/2017-04-26/ x_refsource_CONFIRM
• http://packetstormsecurity.com/files/159266/Jenkins-2.56-CLI-Deserialization-Code-Execution.html x_refsource_MISC
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-1000353 government-resource