Detections
Analytics
Citrix XenServer Multiple Vulnerabilities (CTX216071)
medium Nessus Plugin ID 93608
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Synopsis
The remote host is affected by multiple vulnerabilities.Description
The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities :- A flaw exists due to improper handling of pagetable walks that contain recursive L3 pagetable entries. An attacker on the guest can exploit this to gain elevated privileges. (CVE-2016-7092)
- A flaw exists due to improper handling of instruction pointer truncation when emulating HVM instructions. An attacker on the guest can exploit this to gain elevated privileges. (CVE-2016-7093)
- An overflow condition exists in the x86 HVM guests due to improper handling of writing to pagetables, specifically when the guest is running shadow paging using a subset of the x86 emulator. An attacker on the guest can exploit this to cause a denial of service condition on the host. (CVE-2016-7094)
- A use-after-free error exists when calling the EVTCHNOP_init_control operation with a bad guest frame number. An attacker on the guest can exploit this, by freeing a control structure without also clearing the corresponding pointer, to crash the host or potentially gain elevated privileges. (CVE-2016-7154)
Solution
Apply the appropriate hotfix according to the vendor advisory.See Also
Plugin Details
Severity: Medium
ID: 93608
File Name: citrix_xenserver_CTX216071.nasl
Version: 1.12
Type: local
Family: Misc.
Published: 9/20/2016
Updated: 11/14/2019
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.5
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2016-7154
CVSS v3
Risk Factor: Medium
Base Score: 6.7
Temporal Score: 5.8
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:citrix:xenserver
Required KB Items: Host/XenServer/version, Host/local_checks_enabled
Exploit Ease: No known exploits are available
Patch Publication Date: 9/8/2016
Vulnerability Publication Date: 9/8/2016
Reference Information
CVE: CVE-2016-7092, CVE-2016-7093, CVE-2016-7094, CVE-2016-7154