Bug 851202 (CVE-2012-3516) - CVE-2012-3516 kernel: xen: grant table entry swaps have inadequate bounds checking
Summary: CVE-2012-3516 kernel: xen: grant table entry swaps have inadequate bounds che...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2012-3516
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 854595
Blocks: 851204
TreeView+ depends on / blocked
 
Reported: 2012-08-23 13:37 UTC by Petr Matousek
Modified: 2023-05-11 20:10 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-08-24 16:05:26 UTC
Embargoed:

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Description Petr Matousek 2012-08-23 13:37:46 UTC 
The grant table hypercall's GNTTABOP_swap_grant_ref sub-operation does not perform adequate checks on the input grant references.

A malicious guest kernel or administrator can crash the host.

It may be possible for an attacker to swap a valid grant reference, which they control, with an invalid one allowing them to write abitrary values to hypervisor memory. This could potentially lead to a
privilege escalation.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-08-23 13:40:48 UTC 
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 4 Petr Matousek 2012-09-05 11:56:37 UTC 
Now public via:

http://seclists.org/oss-sec/2012/q3/382
Comment 5 Petr Matousek 2012-09-05 12:05:06 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 854595]
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