TI-2025-05129 Aliases CVE-2025-5689 GHSA-g8qw-mgjx-rwjr

Improper Permission Management in SSH Session Handling

LOW 37CWE-269Published 2025-06-16 · Updated 2025-06-17

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-269.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00302 23rd percentileScored 2026-11-07

Fix Fixed github.com/ubuntu/authd (Go): 0.5.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Canonical	authd	0.0.0 – 0.5.4	—	No fix listed	CNA
—	github.com/ubuntu/authd (Go)	before 0.5.4	0.5.4	Patch available	GHSA-g8qw-mgjx-rwjr

authd VendorCanonical Affected 0.0.0 – 0.5.4 Fixed in — No fix listed CNA
github.com/ubuntu/authd (Go) Vendor— Affected before 0.5.4 Fixed in 0.5.4 Patch available GHSA-g8qw-mgjx-rwjr

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:canonical:authd::::::::	before 0.5.4	Vulnerable	Canonical

cpe:2.3:a:canonical:authd:*:*:*:*:*:*:*:* Versions before 0.5.4 Vulnerable ·Canonical

Remediation

Fix · GHSA-g8qw-mgjx-rwjr github.com/ubuntu/authd (Go) Fixed in 0.5.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-5689
2026-10-03 Alias added: GHSA-g8qw-mgjx-rwjr

References

Patch 1

https://github.com/ubuntu/authd/security/advisories/GHSA-g8qw-mgjx-rwjr

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-5689

Other 2

TI-2024-08645 Improper authentication in Canonical Authd CVSS 3.1HIGH 8.8
TI-2024-08644 Authd, through version 0.3.6, did not sufficiently randomize user IDs to prevent… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences