Linux Foundation Xen up to 4.2.2 EFLAGS Register SYSENTER NT input validation

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.
5.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Foundation Xen and classified as problematic. This vulnerability affects the function SYSENTER of the component EFLAGS Register. This manipulation of the argument NT causes input validation. This vulnerability appears as CVE-2013-1917. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Linux Foundation Xen (Virtualization Software) and classified as problematic. Affected by this vulnerability is the function SYSENTER of the component EFLAGS Register. The manipulation of the argument NT 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. The summary by CVE is:

Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not clear the NT flag when using an IRET after a SYSENTER instruction, which allows PV guest users to cause a denial of service (hypervisor crash) by triggering a #GP fault, which is not properly handled by another IRET instruction.

The weakness was presented 04/18/2013 as not defined mailinglist post (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2013-1917 since 02/19/2013. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 66985 (SuSE 11.2 Security Update : Xen (SAT Patch Number 7798)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 166818 (SUSE Enterprise Linux Security Update for Xen (SUSE-SU-2014:0411-1)).

Applying the patch xsa44 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 X-Force (83646), Tenable (66985), SecurityFocus (BID 59291†), OSVDB (92564†) and Secunia (SA53023†). See VDB-6818 and VDB-8178 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Xen up to 4.2
  • XenServer up to 6.1

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.9

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

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 66985
Nessus Name: SuSE 11.2 Security Update : Xen (SAT Patch Number 7798)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892662
OpenVAS Name: Debian Security Advisory DSA 2662-1 (xen - several vulnerabilities
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: xsa44

Timelineinfo

02/19/2013 🔍
04/18/2013 +58 days 🔍
04/18/2013 +0 days 🔍
04/18/2013 +0 days 🔍
04/18/2013 +0 days 🔍
04/22/2013 +4 days 🔍
04/23/2013 +1 days 🔍
05/13/2013 +20 days 🔍
05/21/2013 +8 days 🔍
06/26/2013 +36 days 🔍
05/10/2021 +2875 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: openwall.com
Status: Not defined

CVE: CVE-2013-1917 (🔍)
GCVE (CVE): GCVE-0-2013-1917
GCVE (VulDB): GCVE-100-8473

OVAL: 🔍

X-Force: 83646
SecurityFocus: 59291 - Xen CVE-2013-1917 Remote Denial of Service Vulnerability
Secunia: 53023 - Xen SYSENTER Handling NT Flag Denial of Service Vulnerability, Not Critical
OSVDB: 92564
SecurityTracker: 1028455
Vulnerability Center: 39670 - Xen 3.1 Through 4.x Running 64-bit Hosts on Intel CPUs Local DoS by Triggering a #GP Fault, Low

See also: 🔍

Entryinfo

Created: 04/23/2013 11:01
Updated: 05/10/2021 08:17
Changes: 04/23/2013 11:01 (82), 04/30/2017 10:41 (4), 05/10/2021 08:17 (3)
Complete: 🔍
Committer: olku
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!