XenSource Xen 4.2/4.3/4.4/4.5 GNTTABOP_swap_grant_ref null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
2.9$0-$5k0.00

A vulnerability classified as problematic was found in XenSource Xen 4.2/4.3/4.4/4.5 (Virtualization Software). Affected by this vulnerability is the function GNTTABOP_swap_grant_ref. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability.

The weakness was presented 06/11/2015 by Jan Beulich with SuSE as XSA-134 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. This vulnerability is known as CVE-2015-4163 since 06/02/2015. An attack has to be approached locally. The successful exploitation needs a single authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 84169 (Debian DSA-3286-1 : xen - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370035 (Citrix XenServer Security Update (CTX201145)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xen.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (103787) and Tenable (84169). See 74497, 75680, 75681 and 75682 for similar entries.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 2.9

VulDB Base Score: 3.3
VulDB Temp Score: 2.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 84169
Nessus Name: Debian DSA-3286-1 : xen - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703286
OpenVAS Name: Debian Security Advisory DSA 3286-1 (xen - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: xenbits.xen.org

Timelineinfo

06/02/2015 🔍
06/11/2015 +9 days 🔍
06/11/2015 +0 days 🔍
06/11/2015 +0 days 🔍
06/12/2015 +1 days 🔍
06/12/2015 +0 days 🔍
06/15/2015 +3 days 🔍
06/15/2015 +0 days 🔍
06/15/2015 +0 days 🔍
06/16/2015 +1 days 🔍
05/21/2022 +2530 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-134
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-4163 (🔍)
OVAL: 🔍

X-Force: 103787 - Xen GNTTABOP_swap_grant_ref denial of service
SecurityTracker: 1032568
Vulnerability Center: 50587 - Xen 4.2 through 4.5 Local DoS via a Hypercall without a GNTTABOP_setup_table or GNTTABOP_set_version, Medium
SecurityFocus: 75141 - Xen CVE-2015-4163 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/12/2015 10:50
Updated: 05/21/2022 01:16
Changes: 06/12/2015 10:50 (76), 06/26/2018 08:46 (10), 05/21/2022 01:16 (3)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!