Bug 875360 (CVE-2012-4542)

Summary:	CVE-2012-4542 kernel: block: default SCSI command filter does not accomodate commands overlap across device classes
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, bhu, dhoward, fhrbata, iboverma, jkacur, jmagrini, jneedle, jrieden, juzhang, kernel-mgr, knoel, lgoncalv, lwang, mcressma, nobody, pbonzini, plougher, qcai, rbalakri, rt-maint, rvrbovsk, security-response-team, tburke, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-10-16 06:37:37 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:	875361, 878123, 878124, 878126, 878127, 878128, 919346, 953626, 1021797
Bug Blocks:	875363

Description Petr Matousek 2012-11-10 19:36:12 UTC

The default SCSI command filter does not accomodate commands that overlap across device classes.

An privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only.

Acknowledgements:

This issue was discovered by Paolo Bonzini of Red Hat.

Comment 2 Paolo Bonzini 2012-11-16 18:00:51 UTC

The full list of overlapping commands:

- READ SUBCHANNEL <-> UNMAP (destructive, but no control on written data)

- GET PERFORMANCE <-> ERASE (not really a problem, no one supports ERASE anyway)

- READ DISC INFORMATION <-> XPWRITE (not commonly implemented but most dangerous)

Comment 5 Petr Matousek 2013-01-24 15:51:13 UTC

Proposed upstream patch:
  https://lkml.org/lkml/2013/1/24/279

Comment 8 errata-xmlrpc 2013-02-21 06:56:49 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0496 https://rhn.redhat.com/errata/RHSA-2013-0496.html

Comment 13 errata-xmlrpc 2013-02-28 18:59:22 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0579 https://rhn.redhat.com/errata/RHSA-2013-0579.html

Comment 14 errata-xmlrpc 2013-03-11 18:39:41 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2013:0622 https://rhn.redhat.com/errata/RHSA-2013-0622.html

Comment 22 errata-xmlrpc 2013-05-30 18:31:39 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.2 EUS - Server Only

Via RHSA-2013:0882 https://rhn.redhat.com/errata/RHSA-2013-0882.html

Comment 23 errata-xmlrpc 2013-06-11 17:38:42 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.3 EUS - Server Only

Via RHSA-2013:0928 https://rhn.redhat.com/errata/RHSA-2013-0928.html

Comment 24 Petr Matousek 2015-10-16 06:37:37 UTC

Statement:

This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7. Due to the lack of upstream patches and the Moderate impact, we are not planning to address this issue in Red Hat Enterprise Linux 7.