Bug 875360 - (CVE-2012-4542) CVE-2012-4542 kernel: block: default SCSI command filter does not accomodate commands overlap across device classes
CVE-2012-4542 kernel: block: default SCSI command filter does not accomodate ...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20130124,repor...
: Security
Depends On: 875361 878123 878124 878126 878127 878128 919346 953626 1021797
Blocks: 875363
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Reported: 2012-11-10 14:36 EST by Petr Matousek
Modified: 2015-10-16 02:37 EDT (History)
25 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2015-10-16 02:37:37 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2012-11-10 14:36:12 EST
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 13:00:51 EST
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 10:51:13 EST
Proposed upstream patch:
  https://lkml.org/lkml/2013/1/24/279
Comment 8 errata-xmlrpc 2013-02-21 01:56:49 EST
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 13:59:22 EST
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 14:39:41 EDT
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 14:31:39 EDT
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 13:38:42 EDT
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 02:37:37 EDT
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.

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