Vulnerability identifier: #VU23679

Vulnerability risk: Medium

CVSSv3.1: 5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16561

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WebSphere Deployer
Web applications / Modules and components for CMS

Vendor: Jenkins

Description
The vulnerability allows a remote attacker to perform a man-in-the-middle (MiTM) attack.

The vulnerability exists due to the affected software unconditionally disables SSL/TLS certificate validation for the entire Jenkins master JVM. A remote user with Overall/Read access can supply a specially crafted SSL/TLS certificate, conduct man-in-the-middle attacks and disable SSL/TLS certificate and hostname validation for the entire Jenkins master JVM, or specify a new Java keystore from a file stored on the Jenkins master filesystem.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

WebSphere Deployer: 1.1 - 1.6.1

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External links
http://jenkins.io/security/advisory/2019-12-17/#SECURITY-1581

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.