Debian LTS Advisory ([SECURITY] [DLA 964-1] xen security update)

Published: 2018-01-28 23:00:00
CVE Author: NIST National Vulnerability Database (NVD)

CVSS Base Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

Affected Versions:
xen on Debian Linux

Recommendations:
For Debian 7 'Wheezy', these problems have been fixed in version 4.1.6.lts1-8. We recommend that you upgrade your xen Linux Distribution Packages.

Summary:
Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-9932 (XSA-200) CMPXCHG8B emulation allows local HVM guest OS users to obtain sensitive information from host stack memory. CVE-2017-7995 Description Xen checks access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads. CVE-2017-8903 (XSA-213) Xen mishandles page tables after an IRET hypercall which can lead to arbitrary code execution on the host OS. The vulnerability is only exposed to 64-bit PV guests. CVE-2017-8904 (XSA-214) Xen mishandles the 'contains segment descriptors' property during GNTTABOP_transfer. This might allow PV guest OS users to execute arbitrary code on the host OS. CVE-2017-8905 (XSA-215) Xen mishandles a failsafe callback which might allow PV guest OS users to execute arbitrary code on the host OS.

Detection Method:
This check tests the installed software version using the apt Linux Distribution Package manager.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2016-9932
https://nvd.nist.gov/vuln/detail/CVE-2017-7995
https://nvd.nist.gov/vuln/detail/CVE-2017-8903
https://nvd.nist.gov/vuln/detail/CVE-2017-8904
https://nvd.nist.gov/vuln/detail/CVE-2017-8905

References:

https://lists.debian.org/debian-lts-announce/2017/06/msg00000.html

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Severity
High
CVSS Score
7.2

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