Canonical authd up to 0.5.4 Pre-auth NSS privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Canonical authd up to 0.5.4. The affected element is an unknown function of the component Pre-auth NSS. The manipulation leads to Remote Privilege Escalation. This vulnerability is traded as CVE-2025-5689. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Canonical authd up to 0.5.4. It has been rated as critical. This issue affects an unknown code of the component Pre-auth NSS. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the temporary user record that authd uses in the pre-auth NSS. As a result, a user login for the first time will be considered to be part of the root group in the context of that SSH session.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-5689 since 06/04/2025. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-18385). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 6.4
CNA Vector (canonical): 🔍

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/04/2025 🔍
06/16/2025 +12 days 🔍
06/16/2025 +0 days 🔍
06/16/2025 +0 days 🔍

Sourcesinfo

Advisory: GHSA-g8qw-mgjx-rwjr
Status: Confirmed

CVE: CVE-2025-5689 (🔍)
GCVE (CVE): GCVE-0-2025-5689
GCVE (VulDB): GCVE-100-312659
EUVD: 🔍

Entryinfo

Created: 06/16/2025 14:43
Updated: 06/16/2025 15:17
Changes: 06/16/2025 14:43 (61), 06/16/2025 15:17 (1)
Complete: 🔍
Cache ID: 216::103

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

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