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Debian LTS Advisory ([SECURITY] [DLA 964-1] xen security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
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.
Affected Software
Affected Software
xen on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For Debian 7 'Wheezy', these problems have been fixed in version 4.1.6.lts1-8. We recommend that you upgrade your xen packages.