PT-2021-22958 · Unknown · Glewlwyd Sso Server

Nicolas Mora · Published 2021-09-08 · Updated 2021-09-15 · CVE-2021-40818

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Glewlwyd SSO server versions 2.5.3 and earlier

Description The issue is related to a buffer overflow that occurs during FIDO2 signature validation in webauthn registration. This happens in the scheme/webauthn.c file of the Glewlwyd SSO server.

Recommendations For Glewlwyd SSO server versions 2.5.3 and earlier, update to a version that fixes the buffer overflow issue in scheme/webauthn.c during FIDO2 signature validation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2021-40818

Affected Products

Glewlwyd Sso Server

References · 10

• https://github.com/babelouest/glewlwyd/commit/0efd112bb62f566877750ad62ee828bff579b4e2 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-40818 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-40818 · Security Note
• https://osv.dev/vulnerability/CVE-2021-40818 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-40818 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-40818 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-40818 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-40818 · Vendor Advisory
• https://bugs.debian.org/993867 · Note
• https://t.me/cibsecurity/28543 · Telegram Post