Bug 1144818 (CVE-2014-3640) - CVE-2014-3640 qemu: slirp: NULL pointer deref in sosendto()
Summary: CVE-2014-3640 qemu: slirp: NULL pointer deref in sosendto()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2014-3640
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: Engineering1144819 Engineering1144820 1144821 Engineering1150462 Engineering1150463
Blocks: Embargoed1141911
TreeView+ depends on / blocked
 
Reported: 2014-09-21 10:49 UTC by Petr Matousek
Modified: 2023-05-12 05:30 UTC (History)
23 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A NULL pointer dereference flaw was found in the way QEMU handled UDP packets with a source port and address of 0 when QEMU's user networking was in use. A local guest user could use this flaw to crash the guest.
Clone Of:
Environment:
Last Closed: 2015-09-18 11:58:47 UTC

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0349 0 normal SHIPPED_LIVE Important: qemu-kvm security, bug fix, and enhancement update 2015-03-05 12:27:34 UTC
Red Hat Product Errata RHSA-2015:0624 0 normal SHIPPED_LIVE Important: qemu-kvm-rhev security, bug fix, and enhancement update 2015-03-05 14:37:36 UTC

Description Petr Matousek 2014-09-21 10:49:01 UTC 
When guest sends udp packet with source port and source addr 0,
uninitialized socket is picked up when looking for matching and already
created udp sockets, and later passed to sosendto() where NULL pointer
dereference is hit during so->slirp->vnetwork_mask.s_addr access.

Only guests using qemu user networking are affected.

Acknowledgements:

Red Hat would like to thank Xavier Mehrenberger and Stephane Duverger of Airbus
for reporting this issue.
Comment 1 Petr Matousek 2014-09-21 10:49:31 UTC 
Statement:

This issue did not affect the kvm package as shipped with Red Hat Enterprise
Linux 5.

Red Hat Product Security has rated this issue as having Low security impact.
Future qemu-kvm updates for Red Hat Enterprise Linux 6 and 7 may address this
issue. For additional information, refer to the Issue Severity
Classification: https://access.redhat.com/security/updates/classification/.
Comment 2 Petr Matousek 2014-09-21 10:49:57 UTC 
Upstream patch submission:

http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg03543.html
Comment 4 Petr Matousek 2014-09-21 10:52:19 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1144821]
Comment 5 Fedora Update System 2014-09-29 04:03:09 UTC 
qemu-2.1.2-2.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2014-10-08 19:01:34 UTC 
qemu-1.6.2-9.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 errata-xmlrpc 2015-03-05 08:12:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0349 https://rhn.redhat.com/errata/RHSA-2015-0349.html
Comment 10 errata-xmlrpc 2015-03-05 09:55:55 UTC 
This issue has been addressed in the following products:

  RHEV-H and Agents for RHEL-7

Via RHSA-2015:0624 https://rhn.redhat.com/errata/RHSA-2015-0624.html
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