Bug 1261461 (CVE-2015-7504, xsa162)

Summary:	CVE-2015-7504 Qemu: net: pcnet: heap overflow vulnerability in pcnet_receive
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	abaron, acathrow, apevec, areis, bmcclain, chrisw, dallan, dblechte, fdeutsch, gkotton, idith, jen, jrusnack, jschluet, knoel, lhh, lpeer, lsurette, markmc, michal.skrivanek, mkenneth, mrezanin, mst, pbonzini, ppandit, pstehlik, rbryant, sclewis, security-response-team, sisharma, slong, srevivo, tdecacqu, virt-maint, ycui, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A heap-based buffer overflow flaw was discovered in the way QEMU's AMD PC-Net II Ethernet Controller emulation received certain packets in loopback mode. A privileged user (with the CAP_SYS_RAWIO capability) inside a guest could use this flaw to crash the host QEMU process (resulting in denial of service) or, potentially, execute arbitrary code with privileges of the host QEMU process.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:43:29 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:	1286543, 1286544, 1286545, 1286547, 1286597, 1287942, 1287950
Bug Blocks:	1261467, 1274348

Description Adam Mariš 2015-09-09 11:40:02 UTC

Qemu emulator built with the AMD PC-Net II Ethernet Controller support is vulnerable to a heap buffer overflow flaw. While receiving packets in the loopback mode, it appends CRC code to the receive buffer. If the data size
given is same as the receive buffer size, the appended CRC code overwrites 4 bytes beyond this 's->buffer' array.

A privileged(CAP_SYS_RAWIO) user inside guest could use this flaw to crash
the Qemu instance resulting in DoS or potentially execute arbitrary code
with privileges of the Qemu process on the host.

Upstream fix:
-------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=837f21aacf5a714c23ddaadbbc5212f9

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2015/11/30/2
  -> http://www.openwall.com/lists/oss-security/2015/11/30/5

Comment 3 Prasad Pandit 2015-11-20 12:17:06 UTC

Statement: 

This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 7 as they do not enable the pcnet backend driver.

This issue does not affect the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.

This issue affects the versions of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5, the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6, and the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3. Future updates for the respective releases may address this flaw.

Please note that AMD PCNet adapter has to be explicitly enabled per-guest as it is not enabled in default configuration and is not supported by Red Hat in Red Hat Enterprise Linux 6 (for a list of supported devices please consult https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Administration_Guide/sect-whitelist-device-options.html).

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and
maintenance life cycle. Though this has been rated as having Important security
impact and is not currently planned to be addressed in future updates. For
additional information, refer to the Red Hat Enterprise Linux Life
Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 4 Prasad Pandit 2015-11-20 12:19:37 UTC

Acknowledgements:

This issue was independently discovered by Qinghao Tang of QIHU 360 Marvel Team and Ling Liu of Qihoo 360 Inc.

Comment 5 Prasad Pandit 2015-11-25 11:07:42 UTC

*** Bug 1274344 has been marked as a duplicate of this bug. ***

Comment 6 Prasad Pandit 2015-11-30 08:32:37 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1286544]

Comment 7 Prasad Pandit 2015-11-30 08:33:05 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1286543]
Affects: epel-5 [bug 1286545]
Affects: epel-7 [bug 1286547]

Comment 11 Fedora Update System 2015-12-17 07:26:16 UTC

xen-4.5.2-5.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 12 Fedora Update System 2015-12-17 07:30:01 UTC

qemu-2.4.1-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 13 Fedora Update System 2015-12-20 00:22:20 UTC

xen-4.5.2-5.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 14 errata-xmlrpc 2015-12-22 15:27:19 UTC

This issue has been addressed in the following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2015:2696 https://rhn.redhat.com/errata/RHSA-2015-2696.html

Comment 15 errata-xmlrpc 2015-12-22 15:28:27 UTC

This issue has been addressed in the following products:

  OpenStack 5 for RHEL 6

Via RHSA-2015:2695 https://rhn.redhat.com/errata/RHSA-2015-2695.html

Comment 16 errata-xmlrpc 2015-12-22 15:29:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:2694 https://rhn.redhat.com/errata/RHSA-2015-2694.html