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Red Hat: Important KVM DoS Vulnerability Alert - RHSA-2017:0454-01

red hat
Calendar Grey March 7, 2017
Scroller Redhat
The Linux kernel in Fedora has been patched with a critical security update that resolves several weaknesses.
An update for kvm is now available for Red Hat Enterprise Linux 5

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Note: The procedure in the Solution section must be performed before this update will take effect.

Summary

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.
Security Fix(es):
* Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator support is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data via bitblt copy in backward mode. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS or potentially execute arbitrary code on the host with privileges of QEMU process on the host. (CVE-2017-2615)
* Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. The issue could occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged user inside guest could use this flaw to crash the QEMU process OR potentially execute arbitrary code on host with privileges of the QEMU process. (CVE-2017-2620)
Red Hat would like to thank Wjjzhang (Tencent.com Inc.) and Li Qiang (360.cn Inc.) for reporting CVE-2017-2615.

Topics%20covered

Topics Covered

security advisory security update arbitrary code execution important doS red hat enterprise linux kvm

References

https://access.redhat.com/security/cve/CVE-2017-2615 https://access.redhat.com/security/cve/CVE-2017-2620 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Desktop Multi OS (v. 5 client):
Source: kvm-83-277.el5_11.src.rpm
x86_64: kmod-kvm-83-277.el5_11.x86_64.rpm kmod-kvm-debug-83-277.el5_11.x86_64.rpm kvm-83-277.el5_11.x86_64.rpm kvm-debuginfo-83-277.el5_11.x86_64.rpm kvm-qemu-img-83-277.el5_11.x86_64.rpm kvm-tools-83-277.el5_11.x86_64.rpm
Red Hat Enterprise Linux Virtualization (v. 5 server):
Source: kvm-83-277.el5_11.src.rpm
x86_64: kmod-kvm-83-277.el5_11.x86_64.rpm kmod-kvm-debug-83-277.el5_11.x86_64.rpm kvm-83-277.el5_11.x86_64.rpm kvm-debuginfo-83-277.el5_11.x86_64.rpm kvm-qemu-img-83-277.el5_11.x86_64.rpm kvm-tools-83-277.el5_11.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2017:0454-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0454.html
Issue date: 2017-03-07

Topic

An update for kvm is now available for Red Hat Enterprise Linux 5.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update arbitrary code execution important doS red hat enterprise linux kvm

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop Multi OS (v. 5 client) - x86_64

Red Hat Enterprise Linux Virtualization (v. 5 server) - x86_64

Bugs Fixed

1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode

1420484 - CVE-2017-2620 Qemu: display: cirrus: potential arbitrary code execution via cirrus_bitblt_cputovideo

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