Debian DSA-3284-1 : qemu - security update

High Nessus Plugin ID 84167

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities were discovered in qemu, a fast processor emulator.

- CVE-2015-3209 Matt Tait of Google's Project Zero security team discovered a flaw in the way QEMU's AMD PCnet Ethernet emulation handles multi-TMD packets with a length above 4096 bytes. A privileged guest user in a guest with an AMD PCNet ethernet card enabled can potentially use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process.

- CVE-2015-4037 Kurt Seifried of Red Hat Product Security discovered that QEMU's user mode networking stack uses predictable temporary file names when the -smb option is used. An unprivileged user can use this flaw to cause a denial of service.

- CVE-2015-4103 Jan Beulich of SUSE discovered that the QEMU Xen code does not properly restrict write access to the host MSI message data field, allowing a malicious guest to cause a denial of service.

- CVE-2015-4104 Jan Beulich of SUSE discovered that the QEMU Xen code does not properly restrict access to PCI MSI mask bits, allowing a malicious guest to cause a denial of service.

- CVE-2015-4105 Jan Beulich of SUSE reported that the QEMU Xen code enables logging for PCI MSI-X pass-through error messages, allowing a malicious guest to cause a denial of service.

- CVE-2015-4106 Jan Beulich of SUSE discovered that the QEMU Xen code does not properly restrict write access to the PCI config space for certain PCI pass-through devices, allowing a malicious guest to cause a denial of service, obtain sensitive information or potentially execute arbitrary code.

Solution

Upgrade the qemu packages.

For the oldstable distribution (wheezy), these problems have been fixed in version 1.1.2+dfsg-6+deb7u8. Only CVE-2015-3209 and CVE-2015-4037 affect oldstable.

For the stable distribution (jessie), these problems have been fixed in version 1:2.1+dfsg-12+deb8u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=787547

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=788460

https://security-tracker.debian.org/tracker/CVE-2015-3209

https://security-tracker.debian.org/tracker/CVE-2015-4037

https://security-tracker.debian.org/tracker/CVE-2015-4103

https://security-tracker.debian.org/tracker/CVE-2015-4104

https://security-tracker.debian.org/tracker/CVE-2015-4105

https://security-tracker.debian.org/tracker/CVE-2015-4106

https://security-tracker.debian.org/tracker/CVE-2015-3209

https://security-tracker.debian.org/tracker/CVE-2015-4037

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

https://packages.debian.org/source/jessie/qemu

https://www.debian.org/security/2015/dsa-3284

Plugin Details

Severity: High

ID: 84167

File Name: debian_DSA-3284.nasl

Version: 2.5

Type: local

Agent: unix

Published: 2015/06/15

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:qemu, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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: 2015/06/13

Reference Information

CVE: CVE-2015-3209, CVE-2015-4037, CVE-2015-4103, CVE-2015-4104, CVE-2015-4105, CVE-2015-4106

BID: 74809, 74947, 74948, 74949, 74950, 75123

DSA: 3284