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Bundled getty can bypass /bin/login

High
troglobit published GHSA-563g-p98j-mc9q Apr 29, 2025

Package

finit

Affected versions

< 4.11

Patched versions

4.11

Description

Impact

Finit versions from v3.0-rc1 and later bundle an implementation of getty for the tty configuration directive that can bypass /bin/login, i.e., a user can log in as any user without authentication.

Example /etc/finit.d/available/getty.conf:

tty [12345789] @console 0 xterm noclear

Patches

Patch planned for the next release, v4.11, scheduled for March 31, 2025.

Workarounds

Use external getty, e.g., agetty from the distribution. Example:

tty [12345] /sbin/agetty /dev/ttyAMA0 xterm noclear

References

N/A

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVE ID

CVE-2025-29906

Weaknesses

No CWEs