Xen up to 4.11.x ARM Grant Table v2 BUG Hypercall resource consumption

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.
5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Xen up to 4.11.x and classified as problematic. The affected element is the function BUG of the component ARM Grant Table v2 Handler. Such manipulation as part of Hypercall leads to resource consumption. This vulnerability is listed as CVE-2018-15469. The attack must be carried out locally. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Xen up to 4.11.x (Virtualization Software) and classified as problematic. Affected by this issue is the function BUG of the component ARM Grant Table v2 Handler. The manipulation as part of a Hypercall leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

An issue was discovered in Xen through 4.11.x. ARM never properly implemented grant table v2, either in the hypervisor or in Linux. Unfortunately, an ARM guest can still request v2 grant tables; they will simply not be properly set up, resulting in subsequent grant-related hypercalls hitting BUG() checks. An unprivileged guest can cause a BUG() check in the hypervisor, resulting in a denial-of-service (crash).

The bug was discovered 08/14/2018. The weakness was presented 08/17/2018 by Jann Horn with Google Project Zero (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability is handled as CVE-2018-15469 since 08/17/2018. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 112156 (Xen Project ARM Grant Table v2 DoS (XSA-268)), 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 171690 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2018:3490-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (112156) and SecurityFocus (BID 103174†). See VDB-113918, VDB-117441, VDB-117508 and VDB-122910 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
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: 112156
Nessus Name: Xen Project ARM Grant Table v2 DoS (XSA-268)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/27/2018 🔍
08/14/2018 +168 days 🔍
08/14/2018 +0 days 🔍
08/17/2018 +2 days 🔍
08/17/2018 +0 days 🔍
08/17/2018 +0 days 🔍
08/18/2018 +1 days 🔍
08/28/2018 +10 days 🔍
05/02/2023 +1708 days 🔍

Sourcesinfo

Advisory: DLA 1577-1
Researcher: Jann Horn
Organization: Google Project Zero
Status: Confirmed

CVE: CVE-2018-15469 (🔍)
GCVE (CVE): GCVE-0-2018-15469
GCVE (VulDB): GCVE-100-123008
SecurityFocus: 103174 - Xen 'xen/common/memory.c' Denial of Service vulnerability

See also: 🔍

Entryinfo

Created: 08/18/2018 10:55
Updated: 05/02/2023 13:51
Changes: 08/18/2018 10:55 (72), 03/16/2020 15:05 (7), 05/02/2023 13:51 (4)
Complete: 🔍
Cache ID: 216:1E1:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Are you interested in using VulDB?

Download the whitepaper to learn more about our service!