Xen up to 4.5.x on Linux input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Xen up to 4.5.x on Linux. The affected element is an unknown function. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2016-3961. The attack is restricted to local execution. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Xen up to 4.5.x on Linux (Virtualization Software) and classified as problematic. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest users to cause a denial of service (guest OS crash) by attempting to access a hugetlbfs mapped area.

The weakness was disclosed 04/15/2016 by Vitaly Kuznetsov with Red Hat (Website). The advisory is available at securitytracker.com. This vulnerability was named CVE-2016-3961 since 04/05/2016. The exploitation appears to be easy. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 90952 (Fedora 22 : kernel-4.4.8-200.fc22 (2016-373c063e79)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196506 (Ubuntu Security Notification for Linux-raspi2 Vulnerabilities (USN-3007-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (90952), SecurityFocus (BID 86068†) and Vulnerability Center (SBV-58218†). The entries VDB-87605 and VDB-91461 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 90952
Nessus Name: Fedora 22 : kernel-4.4.8-200.fc22 (2016-373c063e79)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-703
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Timelineinfo

04/05/2016 🔍
04/14/2016 +9 days 🔍
04/14/2016 +0 days 🔍
04/15/2016 +0 days 🔍
04/15/2016 +0 days 🔍
04/15/2016 +0 days 🔍
04/17/2016 +2 days 🔍
05/06/2016 +19 days 🔍
05/09/2016 +3 days 🔍
07/25/2022 +2268 days 🔍

Sourcesinfo

Advisory: FEDORA-2016-373c063e79⛔
Researcher: Vitaly Kuznetsov
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-3961 (🔍)
GCVE (CVE): GCVE-0-2016-3961
GCVE (VulDB): GCVE-100-82462

OVAL: 🔍

SecurityFocus: 86068 - Xen CVE-2016-3961 Denial of Service Vulnerability
SecurityTracker: 1035569
Vulnerability Center: 58218 - Xen 3.* on Linux Local DoS Vulnerability - CVE-2016-3961, Low

See also: 🔍

Entryinfo

Created: 04/17/2016 19:12
Updated: 07/25/2022 07:44
Changes: 04/17/2016 19:12 (70), 02/04/2019 16:33 (17), 07/25/2022 07:38 (5), 07/25/2022 07:44 (1)
Complete: 🔍
Cache ID: 216:101:103

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