Jenkins 2.213 and earlier, LTS 2.204.1 and earlier improperly reuses encryption key parameters in the Inbound TCP Agent Protocol/3, allowing unauthorized attackers with knowledge of agent names to obtain the connection secrets for those agents, which can be used to connect to Jenkins, impersonating those agents.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2099
Reference (s):
- https://jenkins.io/security/advisory/2020-01-29/#SECURITY-1682
- MLIST:[oss-security] 20200129 Multiple vulnerabilities in Jenkins and Jenkins plugins
- URL: http://www.openwall.com/lists/oss-security/2020/01/29/1
- REDHAT:RHBA-2020:0402
- URL: https://access.redhat.com/errata/RHBA-2020:0402