CVE-2023-28339

Publication date 14 March 2023

Last updated 11 February 2026

Ubuntu priority

Cvss 3 Severity Score

Description

OpenDoas through 6.8.2, when TIOCSTI is available, allows privilege escalation because of sharing a terminal with the original session. NOTE: TIOCSTI is unavailable in OpenBSD 6.0 and later, and can be made unavailable in the Linux kernel 6.2 and later.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
doas	22.10 kinetic	Not in release
	22.04 LTS jammy	Vulnerable, fix deferred
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
opendoas	26.04 LTS resolute	Vulnerable, fix deferred
	25.10 questing	Ignored end of life, was deferred [2026-02-11]
	25.04 plucky	Ignored end of life, was needs-triage
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Vulnerable, fix deferred
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

john-breton

Upstream argues this is a problem with the kernel and not in OpenDoas. As of Linux 6.7, both TIOCSTI and TIOCLINUX can be disabled to prevent this issue. No patch currently exists as of 2026-02-11, and the issue discussing the vulnerability has not received any updates since early 2024.

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.8 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	8.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H