| Description: | Summary:
The remote host is missing an update for the Debian 'xen' package(s) announced via the DLA-571-1 advisory.
Vulnerability Insight:
Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:
CVE-2014-3672 (XSA-180) Andrew Sorensen discovered that a HVM domain can exhaust the hosts disk space by filling up the log file.
CVE-2016-3158 / CVE-2016-3159 (XSA-172) Jan Beulich from SUSE discovered that Xen does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors. A malicious domain can take advantage of this flaw to obtain address space usage and timing information, about another domain, at a fairly low rate.
CVE-2016-3710 (XSA-179) Wei Xiao and Qinghao Tang of 360.cn Inc discovered an out-of-bounds read and write flaw in the QEMU VGA module. A privileged guest user could use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process.
CVE-2016-3712 (XSA-179) Zuozhi Fzz of Alibaba Inc discovered potential integer overflow or out-of-bounds read access issues in the QEMU VGA module. A privileged guest user could use this flaw to mount a denial of service (QEMU process crash).
CVE-2016-3960 (XSA-173) Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360 discovered an integer overflow in the x86 shadow pagetable code. A HVM guest using shadow pagetables can cause the host to crash. A PV guest using shadow pagetables (i.e. being migrated) with PV superpages enabled (which is not the default) can crash the host, or corrupt hypervisor memory, potentially leading to privilege escalation.
CVE-2016-4480 (XSA-176) Jan Beulich discovered that incorrect page table handling could result in privilege escalation inside a Xen guest instance.
CVE-2016-6258 (XSA-182) Jeremie Boutoille discovered that incorrect pagetable handling in PV instances could result in guest to host privilege escalation.
Additionally this Xen Security Advisory without a CVE was fixed: XSA-166 Konrad Rzeszutek Wilk and Jan Beulich discovered that ioreq handling is possibly susceptible to a multiple read issue.
For Debian 7 Wheezy, these problems have been fixed in version 4.1.6.lts1-1.
We recommend that you upgrade your xen packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]
Affected Software/OS:
'xen' package(s) on Debian 7.
Solution:
Please install the updated package(s).
CVSS Score:
7.2
CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
|
