Bug 1066340 - (CVE-2013-4150) CVE-2013-4150 qemu: virtio-net: out-of-bounds buffer write on invalid state load
CVE-2013-4150 qemu: virtio-net: out-of-bounds buffer write on invalid state load
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20131203,repor...
: Reopened, Security
Depends On: 1095688 1095689 1095690 1133850
Blocks: 1036654 1133827
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Reported: 2014-02-18 04:23 EST by Petr Matousek
Modified: 2016-04-26 20:30 EDT (History)
40 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2014-09-22 00:55:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2014-02-18 04:23:26 EST
Michael S. Tsirkin writes:

QEMU 1.5.0 out-of-bounds buffer write in virtio_net_load()@hw/net/virtio-net.c

This code is in hw/net/virtio-net.c:

    if (n->max_queues > 1) {
        if (n->max_queues != qemu_get_be16(f)) {
            error_report("virtio-net: different max_queues ");
            return -1;
        }

        n->curr_queues = qemu_get_be16(f);
        for (i = 1; i < n->curr_queues; i++) {
            n->vqs[i].tx_waiting = qemu_get_be32(f);
        }
    }

Number of vqs is max_queues, so if we get invalid input here,
for example if max_queues = 2, curr_queues = 3, we get
write beyond end of the buffer, with data that comes from
wire.

This might be used to corrupt qemu memory in hard to predict ways.

An user able to alter the savevm data (either on the disk or over the wire
during migration) could use this flaw to to corrupt QEMU process memory on
the (destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.

Upstream fix:
-------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=eea750a5623ddac7a61982eec8f1c93481857578
Comment 1 Petr Matousek 2014-02-18 06:04:19 EST
Statement:

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

This issue does not affect the versions of qemu-kvm package as shipped
with Red Hat Enterprise Linux 6.
Comment 3 Prasad J Pandit 2014-05-08 08:05:10 EDT
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1095688]
Comment 4 Fedora Update System 2014-05-16 06:01:13 EDT
qemu-1.6.2-5.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Prasad J Pandit 2014-07-18 09:31:05 EDT
Acknowledgements:

The issues were discovered as part of the state loading code audit performed by Michael S. Tsirkin of Red Hat, Anthony Liguori and Michael Roth.
Comment 6 errata-xmlrpc 2014-07-23 12:15:37 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0927 https://rhn.redhat.com/errata/RHSA-2014-0927.html
Comment 9 errata-xmlrpc 2014-09-22 00:01:07 EDT
This issue has been addressed in the following products:

  OpenStack 5 for RHEL 7

Via RHSA-2014:1268 https://rhn.redhat.com/errata/RHSA-2014-1268.html

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