Multiple vulnerabilities in Jenkins Mercurial plugin

Published: 2020-11-09

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-2305 CVE-2020-2306
CWE-ID	CWE-611 CWE-264
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Mercurial Web applications / Modules and components for CMS
Vendor	Jenkins

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) XML External Entity injection

EUVDB-ID: #VU48232

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2305

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input. A remote authenticated attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mercurial: 1 - 2.11

External links

http://www.jenkins.io/security/advisory/2020-11-04/#SECURITY-2115

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.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU48233

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2306

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls