|Summary:||CVE-2014-3640 qemu: slirp: NULL pointer deref in sosendto()|
|Product:||[Other] Security Response||Reporter:||Petr Matousek <pmatouse>|
|Component:||vulnerability||Assignee:||Red Hat Product Security <security-response-team>|
|Status:||CLOSED ERRATA||QA Contact:|
|Version:||unspecified||CC:||amit.shah, areis, berrange, cfergeau, dwmw2, ehabkost, itamar, jen, juzhang, knoel, mkenneth, mrezanin, mtosatti, pbonzini, pmatouse, rbalakri, rjones, rpacheco, scottt.tw, stefanha, virt-maint, virt-maint, xfu|
|Fixed In Version:||Doc Type:||Bug Fix|
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.
|Last Closed:||2015-09-18 11:58:47 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Cloudforms Team:||---||Target Upstream Version:|
|Bug Depends On:||1144819, 1144820, 1144821, 1150462, 1150463|
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