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Bug 1389686 - (CVE-2016-9104) CVE-2016-9104 Qemu: 9pfs: integer overflow leading to OOB access
CVE-2016-9104 Qemu: 9pfs: integer overflow leading to OOB access
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20161013,reported=2...
: Security
Depends On: 1389687 1389689
Blocks: 1389508
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Reported: 2016-10-28 05:04 EDT by Prasad J Pandit
Modified: 2018-07-18 11:05 EDT (History)
36 users (show)

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Description Prasad J Pandit 2016-10-28 05:04:35 EDT 
Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9
File System(9pfs) support, is vulnerable to an integer overflow issue. It
could occur by accessing xattributes values.

A privileged user inside guest could use this flaw to crash the Qemu process
instance resulting in DoS.

Upstream patches:
-----------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg02942.html

Reference:
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  -> http://wiki.qemu.org/Documentation/9psetup
Comment 1 Prasad J Pandit 2016-10-28 05:05:10 EDT 
Acknowledgments:

Name: Li Qiang (360.cn Inc.)
Comment 2 Prasad J Pandit 2016-10-28 05:06:35 EDT 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1389689]
Comment 3 Prasad J Pandit 2016-10-28 05:06:57 EDT 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1389687]
Comment 4 Andrej Nemec 2016-10-31 10:48:30 EDT 
CVE assignment:

http://seclists.org/oss-sec/2016/q4/280
Comment 5 Cole Robinson 2017-01-16 13:33:20 EST 
commit dd28fbbc2edc0822965d402d927ce646326d6954
Author: Li Qiang <liqiang6-s@360.cn>
Date:   Tue Nov 1 12:00:40 2016 +0100

    9pfs: add xattrwalk_fid field in V9fsXattr struct

commit 8495f9ad26d398f01e208a53f1a5152483a16084
Author: Li Qiang <liqiang6-s@360.cn>
Date:   Tue Nov 1 12:00:40 2016 +0100

    9pfs: convert 'len/copied_len' field in V9fsXattr to the type of uint64_t

commit 7e55d65c56a03dcd2c5d7c49d37c5a74b55d4bd6
Author: Li Qiang <liqiang6-s@360.cn>
Date:   Tue Nov 1 12:00:40 2016 +0100

    9pfs: fix integer overflow issue in xattr read/write
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