Vulnerability identifier: #VU27521

Vulnerability risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-11021

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
http-client
Web applications / Modules and components for CMS

Vendor: GitHub Actions

Description

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

The vulnerability exists due to Actions Http-Client can disclose Authorization headers to incorrect domain in certain redirect scenarios. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

http-client: 1.0.0 - 1.0.7

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External links
http://github.com/actions/http-client/commit/f6aae3dda4f4c9dc0b49737b36007330f78fd53a
http://github.com/actions/http-client/pull/27
http://github.com/actions/http-client/security/advisories/GHSA-9w6v-m7wp-jwg4

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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. However, proof of concept for this vulnerability is available.