Vulnerability identifier: #VU55330

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32783

CWE-ID: CWE-441

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Contour
Server applications / Other server solutions

Vendor: Project Contour

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a confused deputy flaw. A remote authenticated attacker can send a specially crafted request using ExternalName type Service and gain unauthorized access to sensitive information on the system or perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Contour: 0.1.0 - 1.17.0

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External links
http://github.com/projectcontour/contour/releases/tag/v1.17.1
http://github.com/projectcontour/contour/security/advisories/GHSA-5ph6-qq5x-7jwc
http://github.com/projectcontour/contour/commit/b53a5c4fd927f4ea2c6cf02f1359d8e28bef852e

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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.