| Description: | Summary:
The remote host is missing an update for the Debian 'xen' package(s) announced via the DSA-3286-1 advisory.
Vulnerability Insight:
Multiple security issues have been found in the Xen virtualisation solution:
CVE-2015-3209
Matt Tait 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-2015-4103
Jan Beulich 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 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 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 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.
CVE-2015-4163
Jan Beulich discovered that a missing version check in the GNTTABOP_swap_grant_ref hypercall handler may result in denial of service. This only applies to Debian stable/jessie.
CVE-2015-4164
Andrew Cooper discovered a vulnerability in the iret hypercall handler, which may result in denial of service.
For the oldstable distribution (wheezy), these problems have been fixed in version 4.1.4-3+deb7u8.
For the stable distribution (jessie), these problems have been fixed in version 4.4.1-9+deb8u1. CVE-2015-3209, CVE-2015-4103, CVE-2015-4104, CVE-2015-4105 and CVE-2015-4106 don't affect the Xen package in stable jessie, it uses the standard qemu package and has already been fixed in DSA-3284-1.
For the unstable distribution (sid), these problems will be fixed soon.
We recommend that you upgrade your xen packages.
Affected Software/OS:
'xen' package(s) on Debian 7, Debian 8.
Solution:
Please install the updated package(s).
CVSS Score:
7.8
CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C
|
