Xen up to 4.9.x Grant Mapping access control

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Xen up to 4.9.x and classified as critical. The impacted element is an unknown function of the component Grant Mapping. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2017-14319. The attack is restricted to local execution. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Xen up to 4.9.x (Virtualization Software). It has been declared as critical. This vulnerability affects an unknown code of the component Grant 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:

A grant unmapping issue was discovered in Xen through 4.9.x. When removing or replacing a grant mapping, the x86 PV specific path needs to make sure page table entries remain in sync with other accounting done. Although the identity of the page frame was validated correctly, neither the presence of the mapping nor page writability were taken into account.

The bug was discovered 09/12/2017. The weakness was disclosed 09/12/2017 by Andrew Cooper with Citrix as XSA-234 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2017-14319 since 09/12/2017. 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 103381 (Citrix XenServer Multiple Vulnerabilities (CTX227185)), 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 170341 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2017:2420-1)).

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 (103381) and SecurityFocus (BID 100819†). The entries VDB-106429, VDB-106430 and VDB-106431 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.6

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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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: 103381
Nessus Name: Citrix XenServer Multiple Vulnerabilities (CTX227185)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for xen FEDORA-2017-e399a9008c
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

09/12/2017 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/13/2017 +1 days 🔍
09/14/2017 +1 days 🔍
09/21/2017 +7 days 🔍
01/11/2021 +1208 days 🔍

Sourcesinfo

Advisory: XSA-234
Researcher: Andrew Cooper
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-14319 (🔍)
GCVE (CVE): GCVE-0-2017-14319
GCVE (VulDB): GCVE-100-106432

OVAL: 🔍

SecurityFocus: 100819 - Xen 'mm.c' Remote Privilege Escalation Vulnerability
SecurityTracker: 1039351

See also: 🔍

Entryinfo

Created: 09/13/2017 10:55
Updated: 01/11/2021 16:57
Changes: 09/13/2017 10:55 (69), 11/15/2019 09:03 (13), 01/11/2021 16:57 (2)
Complete: 🔍
Cache ID: 216::103

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