Vulnerability identifier: #VU16937

Vulnerability risk: Low

CVSSv3.1: 4.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1000858

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GnuPG
Client/Desktop applications / Encryption software

Vendor: GNU

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin within dirmngr. A remote attacker can trick the victim to perform a WKD request (enter an email address in the composer window of Thunderbird/Enigmail) and perform arbitrary actions on behalf of the victim.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GnuPG: 2.1.12 - 2.2.11

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External links
http://sektioneins.de/en/advisories/advisory-012018-gnupg-wkd.html
http://sektioneins.de/en/blog/18-11-23-gnupg-wkd.html

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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.