Debian DLA-842-1 : qemu-kvm security update

High Nessus Plugin ID 97439

Synopsis

The remote Debian host is missing a security update.

Description

Several vulnerabilities were discovered in qemu-kvm, a full virtualization solution for Linux hosts on x86 hardware with x86 guests.

CVE-2017-2615

The Cirrus CLGD 54xx VGA Emulator in qemu-kvm 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 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-kvm process on the host.

CVE-2017-2620

The Cirrus CLGD 54xx VGA Emulator in qemu-kvm is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data in cirrus_bitblt_cputovideo.

A privileged user inside 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-kvm process on the host.

CVE-2017-5898

The CCID Card device emulator support is vulnerable to an integer overflow flaw. It could occur while passing message via command/responses packets to and from the host.

A privileged user inside guest could use this flaw to crash the qemu-kvm process on the host resulting in a DoS.

This issue does not affect the qemu-kvm binaries in Debian but we apply the patch to the sources to stay in sync with the qemu package.

CVE-2017-5973

The USB xHCI controller emulator support in qemu-kvm is vulnerable to an infinite loop issue. It could occur while processing control transfer descriptors' sequence in xhci_kick_epctx.

A privileged user inside guest could use this flaw to crash the qemu-kvm process resulting in a DoS.

This update also updates the fix CVE-2016-9921 since it was too strict and broke certain guests.

For Debian 7 'Wheezy', these problems have been fixed in version 1.1.2+dfsg-6+deb7u20.

We recommend that you upgrade your qemu-kvm packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected kvm, qemu-kvm, and qemu-kvm-dbg packages.

See Also

https://lists.debian.org/debian-lts-announce/2017/02/msg00033.html

https://packages.debian.org/source/wheezy/qemu-kvm

Plugin Details

Severity: High

ID: 97439

File Name: debian_DLA-842.nasl

Version: 3.11

Type: local

Agent: unix

Published: 2017/03/01

Updated: 2018/09/07

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 9

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 9.9

Temporal Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:kvm, p-cpe:/a:debian:debian_linux:qemu-kvm, p-cpe:/a:debian:debian_linux:qemu-kvm-dbg, cpe:/o:debian:debian_linux:7.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/02/28

Reference Information

CVE: CVE-2017-2615, CVE-2017-2620, CVE-2017-5898, CVE-2017-5973

IAVB: 2017-B-0024