Bug 2255268 (CVE-2023-51384)

Summary:	CVE-2023-51384 openssh: destination constraints only apply to first PKCS#11 key
Product:	[Other] Security Response	Reporter:	Robb Gatica <rgatica>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bdettelb, caswilli, dfreiber, drow, fjansen, hkataria, jburrell, jmitchel, jsamir, jsherril, jtanner, kaycoth, kshier, orabin, psegedy, sthirugn, tsasak, vkrizan, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	openssh 9.6	Doc Type:	---
Doc Text:	A flaw was found in OpenSSH. When specifying destination constraints while adding PKCS#11-hosted private keys, the constraints only apply to the first key even in cases where the token returns multiple keys.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2255273
Bug Blocks:	2255265

Description Robb Gatica 2023-12-19 19:01:52 UTC

In ssh-agent in OpenSSH before 9.6, when adding PKCS#11-hosted private keys while specifying destination constraints, if the PKCS#11 token returned multiple keys then only the first key had the constraints applied. Use of regular private keys, FIDO tokens and unconstrained keys are unaffected.

References:
https://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754b
https://www.openssh.com/txt/release-9.6
https://www.openwall.com/lists/oss-security/2023/12/18/2

Comment 1 Robb Gatica 2023-12-19 19:35:39 UTC

Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 2255273]