Xen Hypervisor I/O Intercept Code Hypervisor Stack Guest-to-Host Information Disclosure (XSA-239)
high Nessus Plugin ID 103974
Language:
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 unspecified flaw in the hvmemul_do_io() function in arch/x86/hvm/emulate.c that is triggered as an internal structure may contain data from an uninitialized hypervisor stack slot. This may allow an attacker on the guest to gain access to potentially sensitive information from 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.
Solution
Apply the appropriate patch according to the vendor advisory.See Also
Plugin Details
Severity: High
ID: 103974
File Name: xen_server_XSA-239.nasl
Version: 1.7
Type: local
Family: Misc.
Published: 10/19/2017
Updated: 6/3/2021
Configuration: Enable paranoid mode
Risk Information
VPR
Risk Factor: High
Score: 7.3
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Temporal Vector: E:POC/RL:OF/RC:C
CVSS Score Source: CVE-2017-15595
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.9
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:xen:xen
Required KB Items: installed_sw/Xen Hypervisor, Settings/ParanoidReport
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/12/2017
Vulnerability Publication Date: 10/12/2017
Reference Information
CVE: CVE-2017-15588, CVE-2017-15589, CVE-2017-15590, CVE-2017-15591, CVE-2017-15592, CVE-2017-15593, CVE-2017-15594, CVE-2017-15595, CVE-2017-15596
IAVB: 2017-B-0142-S