XenSource Xen 4.5.x/4.6.x/4.7.x SMAP Safety Check input validation

CVSS Meta Temp Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in XenSource Xen 4.5.x/4.6.x/4.7.x. This vulnerability affects unknown code of the component SMAP Safety Check. Such manipulation leads to input validation. This vulnerability is listed as CVE-2016-6259. The attack must be carried out locally. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in XenSource Xen 4.5.x/4.6.x/4.7.x (Virtualization Software). It has been rated as problematic. Affected by this issue is an unknown code block of the component SMAP Safety Check. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability.

The weakness was presented 07/26/2016 by Andrew Cooper with Citrix as XSA-183 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability is handled as CVE-2016-6259 since 07/20/2016. The exploitation is known to be easy. The attack needs to be approached locally. The requirement for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The advisory points out:

Supervisor Mode Access Prevention is a hardware feature designed to make an Operating System more robust, by raising a pagefault rather than accidentally following a pointer into userspace. However, legitimate accesses into userspace require whitelisting, and the exception delivery mechanism for 32bit PV guests wasn't whitelisted.

The vulnerability scanner Nessus provides a plugin with the ID 92675 (FreeBSD : xen-kernel -- x86: Missing SMAP whitelisting in 32-bit exception / event delivery (04cf89e3-5854-11e6-b334-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169239 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2016:2473-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (92675), SecurityFocus (BID 92130†) and SecurityTracker (ID 1036447†). See VDB-90367, VDB-91386, VDB-93998 and VDB-93999 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Not Affected

  • XenSource Xen up to 4.4

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.2
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.2
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92675
Nessus Name: FreeBSD : xen-kernel -- x86: Missing SMAP whitelisting in 32-bit exception / event delivery (04cf89e3-5854-11e6-b334-002590263bf5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 60632
OpenVAS Name: Fedora Update for xen FEDORA-2016-0049aa6e5d
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

07/20/2016 🔍
07/26/2016 +6 days 🔍
07/26/2016 +0 days 🔍
07/26/2016 +0 days 🔍
07/26/2016 +0 days 🔍
07/27/2016 +1 days 🔍
08/02/2016 +6 days 🔍
08/02/2016 +0 days 🔍
09/09/2022 +2229 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-183
Researcher: Andrew Cooper
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-6259 (🔍)
GCVE (CVE): GCVE-0-2016-6259
GCVE (VulDB): GCVE-100-90368
SecurityFocus: 92130 - Xen CVE-2016-6259 Denial of Service Vulnerability
SecurityTracker: 1036447

See also: 🔍

Entryinfo

Created: 07/27/2016 13:22
Updated: 09/09/2022 14:36
Changes: 07/27/2016 13:22 (58), 03/11/2019 20:33 (19), 09/09/2022 14:32 (3), 09/09/2022 14:36 (10)
Complete: 🔍
Cache ID: 216::103

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