Executive Summary

Summary
Title xen security update
Informations
Name DSA-3729 First vendor Publication 2016-12-07
Vendor Debian Last vendor Modification 2016-12-07
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:

CVE-2016-7777 (XSA-190)

Jan Beulich from SUSE discovered that Xen does not properly honor CR0.TS and CR0.EM for x86 HVM guests, potentially allowing guest users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

CVE-2016-9379, CVE-2016-9380 (XSA-198)

Daniel Richman and Gabor Szarka of the Cambridge University Student-Run Computing Facility discovered that pygrub, the boot loader emulator, fails to quote (or sanity check) its results when reporting them to its caller. A malicious guest administrator can take advantage of this flaw to cause an information leak or denial of service.

CVE-2016-9382 (XSA-192)

Jan Beulich of SUSE discovered that Xen does not properly handle x86 task switches to VM86 mode. A unprivileged guest process can take advantage of this flaw to crash the guest or, escalate its privileges to that of the guest operating system.

CVE-2016-9383 (XSA-195)

George Dunlap of Citrix discovered that the Xen x86 64-bit bit test instruction emulation is broken. A malicious guest can take advantage of this flaw to modify arbitrary memory, allowing for arbitrary code execution, denial of service (host crash), or information leaks.

CVE-2016-9385 (XSA-193)

Andrew Cooper of Citrix discovered that Xen's x86 segment base write emulation lacks canonical address checks. A malicious guest administrator can take advantage of this flaw to crash the host, leading to a denial of service.

CVE-2016-9386 (XSA-191)

Andrew Cooper of Citrix discovered that x86 null segments are not always treated as unusable. An unprivileged guest user program may be able to elevate its privilege to that of the guest operating system.

For the stable distribution (jessie), these problems have been fixed in version 4.4.1-9+deb8u8.

We recommend that you upgrade your xen packages.

Original Source

Url : http://www.debian.org/security/2016/dsa-3729

CWE : Common Weakness Enumeration

% Id Name
57 % CWE-20 Improper Input Validation
29 % CWE-264 Permissions, Privileges, and Access Controls
14 % CWE-362 Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 4
Application 17
Os 121

Nessus® Vulnerability Scanner

Date Description
2017-10-13 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2017-0153.nasl - Type : ACT_GATHER_INFO
2017-01-03 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2017-5.nasl - Type : ACT_GATHER_INFO
2017-01-03 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2017-4.nasl - Type : ACT_GATHER_INFO
2017-01-03 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201612-56.nasl - Type : ACT_GATHER_INFO
2016-12-27 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3273-1.nasl - Type : ACT_GATHER_INFO
2016-12-20 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3174-1.nasl - Type : ACT_GATHER_INFO
2016-12-20 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3174-1.nasl - Type : ACT_GATHER_INFO
2016-12-16 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2016-1477.nasl - Type : ACT_GATHER_INFO
2016-12-14 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3156-1.nasl - Type : ACT_GATHER_INFO
2016-12-13 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3083-1.nasl - Type : ACT_GATHER_INFO
2016-12-12 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3067-1.nasl - Type : ACT_GATHER_INFO
2016-12-08 Name : The remote Xen hypervisor installation is missing a security update.
File : xen_server_XSA-198.nasl - Type : ACT_GATHER_INFO
2016-12-08 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-3044-1.nasl - Type : ACT_GATHER_INFO
2016-12-08 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-3729.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_53dbd096ba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_59f79c99ba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_56f0f11eba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_523bb0b7ba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_50ac2e96ba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_4d7cf654ba4d11e6ae1b002590263bf5.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote Fedora host is missing a security update.
File : fedora_2016-999e1a6927.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote Fedora host is missing a security update.
File : fedora_2016-95c104a4c6.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote Fedora host is missing a security update.
File : fedora_2016-68b71978a1.nasl - Type : ACT_GATHER_INFO
2016-12-05 Name : The remote host is affected by multiple vulnerabilities.
File : citrix_xenserver_CTX218775.nasl - Type : ACT_GATHER_INFO
2016-11-25 Name : The remote Debian host is missing a security update.
File : debian_DLA-720.nasl - Type : ACT_GATHER_INFO
2016-11-23 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2016-0166.nasl - Type : ACT_GATHER_INFO
2016-11-23 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2016-0165.nasl - Type : ACT_GATHER_INFO
2016-11-23 Name : The remote OracleVM host is missing one or more security updates.
File : oraclevm_OVMSA-2016-0164.nasl - Type : ACT_GATHER_INFO
2016-11-15 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201611-09.nasl - Type : ACT_GATHER_INFO
2016-11-15 Name : The remote Fedora host is missing a security update.
File : fedora_2016-81e5a36d8c.nasl - Type : ACT_GATHER_INFO
2016-11-04 Name : The remote Debian host is missing a security update.
File : debian_DLA-699.nasl - Type : ACT_GATHER_INFO
2016-10-20 Name : The remote Xen hypervisor installation is missing a security update.
File : xen_server_XSA-190.nasl - Type : ACT_GATHER_INFO
2016-10-14 Name : The remote Fedora host is missing a security update.
File : fedora_2016-4c407cd849.nasl - Type : ACT_GATHER_INFO
2016-10-14 Name : The remote Fedora host is missing a security update.
File : fedora_2016-689f240960.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
2
Date Informations
2017-01-26 12:07:48
  • Multiple Updates
2016-12-09 13:25:25
  • Multiple Updates
2016-12-08 00:23:07
  • First insertion