Debian Security Advisory DSA 4112-1 (xen - security update)

Published: 2018-02-13 23:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:L/AC:M/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 the stable distribution (stretch), these problems have been fixed in version 4.8.3+comet2+shim4.10.0+comet3-1+deb9u4.1. We recommend that you upgrade your xen Linux Distribution Packages. For the detailed security status of xen please refer to its security tracker page linked in the references.

Summary:
Multiple vulnerabilities have been discovered in the Xen hypervisor: CVE-2017-17563 Jan Beulich discovered that an incorrect reference count overflow check in x86 shadow mode may result in denial of service or privilege escalation. CVE-2017-17564 Jan Beulich discovered that improper x86 shadow mode reference count error handling may result in denial of service or privilege escalation. CVE-2017-17565 Jan Beulich discovered that an incomplete bug check in x86 log-dirty handling may result in denial of service. CVE-2017-17566 Jan Beulich discovered that x86 PV guests may gain access to internally used pages which could result in denial of service or potential privilege escalation. In addition this update ships the Comet shim to address the Meltdown class of vulnerabilities for guests with legacy PV kernels. In addition, the Linux Distribution Package provides the Xen PTI stage 1 mitigation which is built-in and enabled by default on Intel systems, but can be disabled with `xpti=false' on the hypervisor command line (It does not make sense to use both xpti and the Comet shim.) Additional information can also be found in README.pti and README.comet.

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-2017-17563
https://nvd.nist.gov/vuln/detail/CVE-2017-17564
https://nvd.nist.gov/vuln/detail/CVE-2017-17565
https://nvd.nist.gov/vuln/detail/CVE-2017-17566

References:

https://www.debian.org/security/2018/dsa-4112.html
https://security-tracker.debian.org/tracker/xen

Severity
Medium
CVSS Score
6.9
Published
2018-02-13
Modified
2019-03-18
Category
Debian Local Security Checks

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