Vulnerability identifier: #VU56451

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40818

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Glewlwyd SSO server
Server applications / Other server solutions

Vendor: Nicolas Mora

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in scheme/webauthn.c. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Glewlwyd SSO server: 1.0 - 2.5.3

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External links
http://bugs.debian.org/993867
http://github.com/babelouest/glewlwyd/commit/0efd112bb62f566877750ad62ee828bff579b4e2

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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.