CVE-2023-28531

Publication date 17 March 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

ssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is 8.9.

Read the notes from the security team

Why is this CVE low priority?

Only affects configurations using agent forwarding, smartcard keys, and per-hop destination constraints. Policy bypass only.

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssh	23.10 mantic	Not affected
	23.04 lunar	Fixed 1:9.0p1-1ubuntu8.6
	22.10 kinetic	Ignored end of life
	22.04 LTS jammy	Fixed 1:8.9p1-3ubuntu0.5
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
openssh-ssh1	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

seth-arnold

openssh-ssh1 is provided for compatibility with old devices that cannot be upgraded to modern protocols. Thus we may not provide security support for this package if doing so would prevent access to equipment.

sbeattie

introduced in openssh 8.9

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openssh	Upstream: 54ac4ab

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-6560-1
OpenSSH vulnerabilities
19 December 2023