Bug 1966241 (CVE-2021-3571)

Summary:	CVE-2021-3571 linuxptp: wrong length of one-step follow-up in transparent clock
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mcascell, mlichvar, security-response-team, yalli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	linuxptp 3.1.1, linuxptp 2.0.1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the ptp4l program of the linuxptp package. When ptp4l is operating on a little-endian architecture as a PTP transparent clock, a remote attacker could send a crafted one-step sync message to cause an information leak or crash. The highest threat from this vulnerability is to data confidentiality and system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 19:23:27 UTC	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:	1966509, 1966517, 1979401
Bug Blocks:	1966236, 1966242

Description Guilherme de Almeida Suckevicz 2021-05-31 17:31:39 UTC

When ptp4l is operating on a little-endian architecture as a PTP tranparent clock and forwards a one-step sync message, it generates a follow-up message which has an incorrect length, sending data past the message buffer. An attacker with access to the network can send a one-step sync message to cause an information leak or crash.

Comment 3 Mauro Matteo Cascella 2021-07-05 21:39:20 UTC

Upstream fix:
https://sourceforge.net/p/linuxptp/code/ci/d61d77e163dbee247819f3d88593ba111577af15 [master]
https://sourceforge.net/p/linuxptp/code/ci/0b3ab45de6a96ca181a5cf62c3c2b97167e2ed20 [v3.1.1]
https://sourceforge.net/p/linuxptp/code/ci/2eac9118ca82c2d368df5490f4be96ee9e32a80c [v2.0.1]

Comment 4 Mauro Matteo Cascella 2021-07-05 21:39:43 UTC

Created linuxptp tracking bugs for this issue:

Affects: fedora-all [bug 1979401]

Comment 6 Mauro Matteo Cascella 2021-07-06 09:18:55 UTC

This flaw has been rated as having a Moderate impact. The information leak is probably not very useful on its own as ptp4l doesn't handle any sensitive or confidential data like passwords, private keys, etc.

Comment 7 errata-xmlrpc 2021-11-09 18:13:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4321 https://access.redhat.com/errata/RHSA-2021:4321

Comment 8 Product Security DevOps Team 2021-11-09 19:23:24 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3571