Xen up to 4.9.x on x86 Grant Reference Mapping access control

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Xen 4.5.x/4.6.x/4.7.x/4.8.x/4.9.x on x86. This affects an unknown function of the component Grant Reference Mapping. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2017-12137. The attack requires local access. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Xen 4.5.x/4.6.x/4.7.x/4.8.x/4.9.x on x86 (Virtualization Software). It has been declared as critical. This vulnerability affects an unknown part of the component Grant Reference Mapping. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

arch/x86/mm.c in Xen allows local PV guest OS users to gain host OS privileges via vectors related to map_grant_ref.

The bug was discovered 08/15/2017. The weakness was presented 08/15/2017 by Andrew Cooper with Citrix as XSA-227 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2017-12137 since 08/01/2017. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 102526 (Citrix XenServer Multiple Vulnerabilities (CTX225941)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 390007 (Oracle VM Server for x86 Security Update for xen (OVMSA-2017-0142)).

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 (102526), SecurityFocus (BID 100342†) and SecurityTracker (ID 1039174†). See VDB-101094, VDB-105309, VDB-105389 and VDB-105391 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
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: 102526
Nessus Name: Citrix XenServer Multiple Vulnerabilities (CTX225941)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53376
OpenVAS Name: Debian Security Advisory DSA 3969-1 (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: 🔍

Timelineinfo

08/01/2017 🔍
08/15/2017 +14 days 🔍
08/15/2017 +0 days 🔍
08/15/2017 +0 days 🔍
08/15/2017 +0 days 🔍
08/16/2017 +1 days 🔍
08/16/2017 +0 days 🔍
08/16/2017 +0 days 🔍
08/24/2017 +8 days 🔍
11/07/2019 +805 days 🔍

Sourcesinfo

Advisory: XSA-227
Researcher: Andrew Cooper
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12137 (🔍)
GCVE (CVE): GCVE-0-2017-12137
GCVE (VulDB): GCVE-100-105388

OVAL: 🔍

SecurityFocus: 100342 - Xen CVE-2017-12137 Privilege Escalation Vulnerability
SecurityTracker: 1039174

See also: 🔍

Entryinfo

Created: 08/16/2017 22:13
Updated: 11/07/2019 15:38
Changes: 08/16/2017 22:13 (81), 11/07/2019 15:38 (6)
Complete: 🔍
Cache ID: 216::103

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