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centosCentOS ProjectCESA-2015:2694
HistoryDec 22, 2015 - 5:18 p.m.

qemu security update

2015-12-2217:18:03
CentOS Project
lists.centos.org
75

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

0.046

Percentile

92.7%

CentOS Errata and Security Advisory CESA-2015:2694

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the
user-space component for running virtual machines using KVM.

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. (CVE-2015-7504)

A buffer overflow flaw was found in the way QEMU’s AMD PC-Net II emulation
validated certain received packets from a remote host in non-loopback mode.
A remote, unprivileged attacker could potentially use this flaw to execute
arbitrary code on the host with the privileges of the QEMU process.
Note that to exploit this flaw, the guest network interface must have a
large MTU limit. (CVE-2015-7512)

Red Hat would like to thank Qinghao Tang of QIHU 360 Marvel Team and Ling
Liu of Qihoo 360 Inc. for reporting the CVE-2015-7504 issue, and Ling Liu
of Qihoo 360 Inc. for reporting the CVE-2015-7512 issue. The CVE-2015-7512
issue was independently discovered by Jason Wang of Red Hat.

All qemu-kvm users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing this
update, shut down all running virtual machines. Once all virtual machines
have shut down, start them again for this update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2015-December/083743.html

Affected packages:
qemu-guest-agent
qemu-img
qemu-kvm
qemu-kvm-tools

Upstream details at:
https://access.redhat.com/errata/RHSA-2015:2694

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

0.046

Percentile

92.7%