CVSS2
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
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
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
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
CentOS | 6 | i686 | qemu-guest-agent | < 0.12.1.2-2.479.el6_7.3 | qemu-guest-agent-0.12.1.2-2.479.el6_7.3.i686.rpm |
CentOS | 6 | x86_64 | qemu-guest-agent | < 0.12.1.2-2.479.el6_7.3 | qemu-guest-agent-0.12.1.2-2.479.el6_7.3.x86_64.rpm |
CentOS | 6 | x86_64 | qemu-img | < 0.12.1.2-2.479.el6_7.3 | qemu-img-0.12.1.2-2.479.el6_7.3.x86_64.rpm |
CentOS | 6 | x86_64 | qemu-kvm | < 0.12.1.2-2.479.el6_7.3 | qemu-kvm-0.12.1.2-2.479.el6_7.3.x86_64.rpm |
CentOS | 6 | x86_64 | qemu-kvm-tools | < 0.12.1.2-2.479.el6_7.3 | qemu-kvm-tools-0.12.1.2-2.479.el6_7.3.x86_64.rpm |
CVSS2
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
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
Percentile
92.7%