This security advisory describes one critical risk vulnerability.
Exploit availability: YesDescription
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to the flaw in the remoting module when handling malicious objects. A remote attacker can transfer a specially crafted serialized Java object to the Jenkins CLI, make Jenkins connect to an attacker-controlled LDAP server, bypass existing protection mechanisms and execute arbitrary code on vulnerable system.
Successful exploitation of the vulnerability results in arbitrary code excution on the vulnerable system.
Note: the vulnerability was being actively exploited.
Update Jenkins LTS to version 2.19.3.
Update Jenkins to version 2.32.
Jenkins: 2.19.2, 2.19.3, 2.31, 2.32CPE
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.