Xen Hypervisor XENMEM_exchange Memory Disclosure (XSA-212)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Xen hypervisor installation is missing a security update.

Description :

According to its self-reported version number, the Xen hypervisor
installed on the remote host is affected by an out-of-array memory
access error in the memory_exchange() function in file common/memory.c
due to improper checking of XENMEM_exchange input. An attacker on a
64-bit PV guest VM who has administrative privileges can exploit this
issue to access arbitrary system memory locations, which can then be
potentially used for further compromising the host.

Note that Nessus has checked the changeset versions based on the
xen.git change log. Nessus did not check guest hardware configurations
or if patches were applied manually to the source code before a
recompile and reinstall.

See also :

https://xenbits.xen.org/xsa/advisory-212.html
https://xenbits.xen.org/gitweb/?p=xen.git;a=summary

Solution :

Apply the appropriate patch according to the vendor advisory.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.0
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 99399 ()

Bugtraq ID: 97375

CVE ID: CVE-2017-7228

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