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CVE-2015-2756

Status Candidate

Overview

QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.

Related Files

Ubuntu Security Notice USN-2608-1
Posted May 13, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2608-1 - Jason Geffner discovered that QEMU incorrectly handled the virtual floppy driver. This issue is known as VENOM. A malicious guest could use this issue to cause a denial of service, or possibly execute arbitrary code on the host as the user running the QEMU process. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. Daniel P. Berrange discovered that QEMU incorrectly handled VNC websockets. A remote attacker could use this issue to cause QEMU to consume memory, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 14.10 and Ubuntu 15.04. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2015-1779, CVE-2015-2756, CVE-2015-3456
SHA-256 | 8016922249d1200857b855be754556a4986b2239c15572207796d8c4f2e6d88f
Debian Security Advisory 3259-1
Posted May 13, 2015
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3259-1 - Several vulnerabilities were discovered in the qemu virtualisation solution.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2014-9718, CVE-2015-1779, CVE-2015-2756, CVE-2015-3456
SHA-256 | 0023f319a16ece6a882500e80e69ae44288802e335ef47565d8d36f8fc537ea8
Gentoo Linux Security Advisory 201504-04
Posted Apr 13, 2015
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201504-4 - Multiple vulnerabilities have been found in Xen, the worst of which can allow remote attackers to cause a Denial of Service condition. Versions less than 4.4.2-r1 are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2013-2212, CVE-2013-3495, CVE-2014-3967, CVE-2014-3968, CVE-2014-5146, CVE-2014-5149, CVE-2014-8594, CVE-2014-8595, CVE-2014-8866, CVE-2014-8867, CVE-2014-9030, CVE-2014-9065, CVE-2014-9066, CVE-2015-0361, CVE-2015-2044, CVE-2015-2045, CVE-2015-2152, CVE-2015-2751, CVE-2015-2752, CVE-2015-2756
SHA-256 | 2502e45c47e6b01b6b3a981d284f6ec59e302110b8448a83b082f2cce67992e2
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