VDB-120119 · CVE-2018-12891 · XSA-264

Xen 4.6.x/4.7.x/4.8.x/4.9.x/4.10.x PV MMU Preemption resource management

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.
6.3	$0-$5k	0.00

A vulnerability was found in Xen 4.6.x/4.7.x/4.8.x/4.9.x/4.10.x (Virtualization Software) and classified as critical. This issue affects some unknown processing of the component PV MMU Preemption. The manipulation with an unknown input leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability.

The bug was discovered 06/27/2018. The weakness was shared 06/27/2018 by Jan Beulich as XSA-264 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. The identification of this vulnerability is CVE-2018-12891 since 06/26/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 111348 (SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:2059-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176820 (Debian Security Update for xen (DLA 1577-1)).

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 vulnerability database at Tenable (111348). The entries 119508, 120120 and 120147 are related to this item.

Productinfo

Type

Virtualization Software

Name

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 111348
Nessus Name: SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:2059-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

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

06/26/2018 🔍
06/27/2018 +1 days 🔍
06/27/2018 +0 days 🔍
06/27/2018 +0 days 🔍
06/27/2018 +0 days 🔍
06/28/2018 +1 days 🔍
07/01/2018 +3 days 🔍
07/02/2018 +0 days 🔍
07/26/2018 +24 days 🔍
03/29/2023 +1707 days 🔍

Sourcesinfo

Advisory: XSA-264
Researcher: Jan Beulich
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12891 (🔍)
OVAL: 🔍

SecurityTracker: 1041201
SecurityFocus: 104570 - Xen CVE-2018-12891 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 07/01/2018 10:56
Updated: 03/29/2023 14:24
Changes: 07/01/2018 10:56 (80), 02/23/2020 14:21 (5), 03/29/2023 14:24 (4)
Complete: 🔍