SB2018090506 - Multiple vulnerabilities in Jenkins
Published: September 5, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Deserialization on untrusted data (CVE-ID: CVE-2018-1999042)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists in XStream2.java due to deserializing of an instance of java.net.URL. A remote attacker can supply malicious input and and have Jenkins resolve a domain name.
2) Denial of service (CVE-ID: CVE-2018-1999043)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an error in BasicAuthenticationFilter.java, BasicHeaderApiTokenAuthenticator.java. A remote attacker can attempt to log in using invalid credentials, create ephemeral in-memory user records and cause the service to crash.
3) Infinite loop (CVE-ID: CVE-2018-1999044)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an infinite loop in CronTab.java. A remote attacker can have a request handling thread, trigger infinite loop and cause the service to crash.
4) Improper authentication (CVE-ID: CVE-2018-1999045)
The vulnerability allows a remote attacker to bypass authentication on the target system.
The vulnerability exists due to improper authentication in SecurityRealm.java, TokenBasedRememberMeServices2.java. A remote attacker with a valid cookie can remain logged in even if that feature is disabled.
5) Information disclosure (CVE-ID: CVE-2018-1999046)
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.
The vulnerability exists due to an error in Computer.java. A remote attacker with Overall/Read permission can access the connection log for any agent.
6) Improper authorization (CVE-ID: CVE-2018-1999047)
The vulnerability allows a remote attacker to bypass authorization on the target system.
The vulnerability exists due to improper authorization in UpdateCenter.java. A remote attacker can cancel a Jenkins restart scheduled through the update center.
Remediation
Install update from vendor's website.