GnuPG up to 2.2.11 cross-site request forgery

Summaryinfo

A vulnerability has been found in GnuPG up to 2.2.11 and classified as problematic. This issue affects some unknown processing. Performing a manipulation results in cross-site request forgery. This vulnerability is reported as CVE-2018-1000858. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic has been found in GnuPG up to 2.2.11. This affects an unknown part. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on integrity. The summary by CVE is:

GnuPG version 2.1.12 - 2.2.11 contains a Cross ite Request Forgery (CSRF) vulnerability in dirmngr that can result in Attacker controlled CSRF, Information Disclosure, DoS. This attack appear to be exploitable via Victim must perform a WKD request, e.g. enter an email address in the composer window of Thunderbird/Enigmail. This vulnerability appears to have been fixed in after commit 4a4bb874f63741026bd26264c43bb32b1099f060.

The bug was discovered 11/23/2018. The weakness was disclosed 12/20/2018 (Website). It is possible to read the advisory at sektioneins.de. This vulnerability is uniquely identified as CVE-2018-1000858 since 12/20/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 27 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 121140 (Fedora 29 : gnupg2 (2019-75a8da28f0)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171988 (OpenSUSE Security Update for gpg2 (openSUSE-SU-2019:0020-1)).

Applying the patch 4a4bb874f63741026bd26264c43bb32b1099f060 is able to eliminate this problem. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (121140). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• GnuPG

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11

License

• open-source

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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