Bug 1389686 (CVE-2016-9104)

Summary:	CVE-2016-9104 Qemu: 9pfs: integer overflow leading to OOB access
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, amit.shah, apevec, areis, ayoung, berrange, cfergeau, chrisw, crobinso, cvsbot-xmlrpc, drjones, dwmw2, imammedo, itamar, jen, jschluet, kbasil, knoel, lhh, lpeer, markmc, m.a.young, mkenneth, mrezanin, mst, pbonzini, rbryant, rjones, rkrcmar, sclewis, srevivo, tdecacqu, virt-maint, virt-maint, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:01:35 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:	1389687, 1389689
Bug Blocks:	1389508

Description Prasad Pandit 2016-10-28 09:04:35 UTC

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:
----------
  -> http://wiki.qemu.org/Documentation/9psetup

Comment 1 Prasad Pandit 2016-10-28 09:05:10 UTC

Acknowledgments:

Name: Li Qiang (360.cn Inc.)

Comment 2 Prasad Pandit 2016-10-28 09:06:35 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1389689]

Comment 3 Prasad Pandit 2016-10-28 09:06:57 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1389687]

Comment 4 Andrej Nemec 2016-10-31 14:48:30 UTC

CVE assignment:

http://seclists.org/oss-sec/2016/q4/280

Comment 5 Cole Robinson 2017-01-16 18:33:20 UTC

commit dd28fbbc2edc0822965d402d927ce646326d6954
Author: Li Qiang <liqiang6-s>
Date:   Tue Nov 1 12:00:40 2016 +0100

    9pfs: add xattrwalk_fid field in V9fsXattr struct

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

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