#VU46880 Path traversal in Blue Ocean - CVE-2020-2254

Vulnerability identifier: #VU46880

Vulnerability risk: Low

CVSSv4.0: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-2254

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Blue Ocean
Web applications / Modules and components for CMS

Vendor: Jenkins

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to the affected plugin provides an undocumented feature flag, "blueocean.features.GIT_READ_SAVE_TYPE", that when set to the value "clone". A remote authenticated attacker with Item/Configure or Item/Create permission can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Blue Ocean: 1.0.0 - 1.23.2

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External links
https://www.openwall.com/lists/oss-security/2020/09/16/3
https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1956

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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.