Glewlwyd SSO Server up to 2.5.3 FIDO2 Signature scheme/webauthn.c buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Glewlwyd SSO Server up to 2.5.3. It has been declared as critical. Impacted is an unknown function of the file scheme/webauthn.c of the component FIDO2 Signature Handler. The manipulation results in buffer overflow. This vulnerability is identified as CVE-2021-40818. There is not any exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability classified as critical has been found in Glewlwyd SSO Server up to 2.5.3. Affected is some unknown processing of the file scheme/webauthn.c of the component FIDO2 Signature Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. 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. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 09/09/2021. The advisory is available at bugs.debian.org. This vulnerability is traded as CVE-2021-40818. Technical details are known, but there is no available exploit.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

09/08/2021 🔍
09/09/2021 +1 days 🔍
09/09/2021 +0 days 🔍
09/11/2021 +2 days 🔍

Sourcesinfo

Advisory: 0efd112bb62f566877750ad62ee828bff579b4e2
Status: Confirmed

CVE: CVE-2021-40818 (🔍)
GCVE (CVE): GCVE-0-2021-40818
GCVE (VulDB): GCVE-100-182286

Entryinfo

Created: 09/09/2021 14:44
Updated: 09/11/2021 14:12
Changes: 09/09/2021 14:44 (39), 09/11/2021 14:12 (3)
Complete: 🔍
Cache ID: 216::103

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