Improper Authentication in Jenkins and LTS



Published: 2020-01-30
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-2099
CWE-ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Jenkins
Server applications / Application servers

Jenkins LTS
Server applications / Application servers

Vendor Jenkins

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Authentication

EUVDB-ID: #VU24758

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2099

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the affected software improperly reuses encryption key parameters in the Inbound TCP Agent Protocol/3. A remote attacker with knowledge of agent names can obtain the connection secrets for those agents, which can be used to connect to Jenkins, impersonating those agents.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.213

Jenkins LTS: 2.7.1 - 2.204.1


CPE2.3 External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1682

Q & A

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.



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