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Debian Security Advisory DSA-3969-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
September 12, 2017 https://www.debian.org/security/faq
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Package : xen
CVE ID : CVE-2017-10912 CVE-2017-10913 CVE-2017-10914
CVE-2017-10915 CVE-2017-10916 CVE-2017-10917
CVE-2017-10918 CVE-2017-10919 CVE-2017-10920
CVE-2017-10921 CVE-2017-10922 CVE-2017-12135
CVE-2017-12136 CVE-2017-12137 CVE-2017-12855

Multiple vulnerabilities have been discovered in the Xen hypervisor:

CVE-2017-10912

Jann Horn discovered that incorrectly handling of page transfers might
result in privilege escalation.

CVE-2017-10913 / CVE-2017-10914

Jann Horn discovered that race conditions in grant handling might
result in information leaks or privilege escalation.

CVE-2017-10915

Andrew Cooper discovered that incorrect reference counting with
shadow paging might result in privilege escalation.

CVE-2017-10916

Andrew Cooper discovered an information leak in the handling
of the the Memory Protection Extensions (MPX) and Protection
Key (PKU) CPU features. This only affects Debian stretch.

CVE-2017-10917

Ankur Arora discovered a NULL pointer dereference in event
polling, resulting in denial of service.

CVE-2017-10918

Julien Grall discovered that incorrect error handling in
physical-to-machine memory mappings may result in privilege
escalation, denial of service or an information leak.

CVE-2017-10919

Julien Grall discovered that that incorrect handling of
virtual interrupt injection on ARM systems may result in
denial of service.

CVE-2017-10920 / CVE-2017-10921 / CVE-2017-10922

Jan Beulich discovered multiple places where reference
counting on grant table operations was incorrect, resulting
in potential privilege escalation

CVE-2017-12135

Jan Beulich found multiple problems in the handling of
transitive grants which could result in denial of service
and potentially privilege escalation.

CVE-2017-12136

Ian Jackson discovered that race conditions in the allocator
for grant mappings may result in denial of service or privilege
escalation. This only affects Debian stretch.

CVE-2017-12137

Andrew Cooper discovered that incorrect validation of
grants may result in privilege escalation.

CVE-2017-12855

Jan Beulich discovered that incorrect grant status handling, thus
incorrectly informing the guest that the grant is no longer in use.

XSA-235 (no CVE yet)

Wei Liu discovered that incorrect locking of add-to-physmap
operations on ARM may result in denial of service.

For the oldstable distribution (jessie), these problems have been fixed
in version 4.4.1-9+deb8u10.

For the stable distribution (stretch), these problems have been fixed in
version 4.8.1-1+deb9u3.

We recommend that you upgrade your xen packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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