CVE-2021-40818 : scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow dur

scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in webauthn registration.

Published 2021-09-08 22:15:11

Updated 2021-09-15 14:59:37

Source MITRE

View at NVD, CVE.org

Vulnerability category: Overflow

Products affected by CVE-2021-40818

Glewlwyd Sso Server Project » Glewlwyd Sso Server
Versions up to, including, (<=) 2.5.3
cpe:2.3:a:glewlwyd_sso_server_project:glewlwyd_sso_server:*:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.46%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 61 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

Assigned by: nvd@nist.gov (Primary)

https://github.com/babelouest/glewlwyd/commit/0efd112bb62f566877750ad62ee828bff579b4e2

Fix fido2 signature validation bug · babelouest/glewlwyd@0efd112 · GitHub
Patch;Third Party Advisory
https://bugs.debian.org/993867

#993867 - glewlwyd: CVE-2021-40818: webauthn buffer overflow - Debian Bug report logs
Issue Tracking;Mailing List;Third Party Advisory

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