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Bug 1436798 - (CVE-2017-7294) CVE-2017-7294 kernel: drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
CVE-2017-7294 kernel: drm/vmwgfx: fix integer overflow in vmw_surface_define_...
Status: NEW
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=20170328,repor...
: Security
Depends On: 1437894 1437899 1436802 1437432 1437895 1437896 1437897 1437898 1437900 1437901 1470097
Blocks: 1392508
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Reported: 2017-03-28 13:30 EDT by Vladis Dronov
Modified: 2018-08-28 18:14 EDT (History)
33 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An out-of-bounds write vulnerability was found in the Linux kernel's vmw_surface_define_ioctl() function, in the 'drivers/gpu/drm/vmwgfx/vmwgfx_surface.c' file. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0676 None None None 2018-04-10 04:05 EDT
Red Hat Product Errata RHSA-2018:1062 None None None 2018-04-10 05:28 EDT

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Description Vladis Dronov 2017-03-28 13:30:19 EDT 
In was found that in the Linux kernel in vmw_surface_define_ioctl() function in 'drivers/gpu/drm/vmwgfx/vmwgfx_surface.c' file, a 'req->mip_levels[i]' are user-controlled values which are not checked for the upper limit and are used to calculate 'num_sizes' parameter. Both the 'num_sizes' and the array are 'uint32_t' so it is possible to make 'num_sizes' overflow. Later 'mip_levels[i]' are used as the loop count. This can lead an oob-write and/or kernel lock up. 

Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

http://seclists.org/oss-sec/2017/q1/688

Proposed patch:

https://lists.freedesktop.org/archives/dri-devel/2017-March/137094.html
Comment 1 Vladis Dronov 2017-03-28 13:33:32 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1436802]
Comment 8 Vladis Dronov 2017-03-31 08:38:11 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code where the flaw was found is not present in this product.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
Comment 9 errata-xmlrpc 2018-04-10 04:04:52 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676
Comment 10 errata-xmlrpc 2018-04-10 05:28:34 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062
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