resource accounting issues in x86 IOREQ server handling

2018-11-2012:00:00

Xen Project

xenbits.xen.org

236

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

0.0004 Low

EPSS

Percentile

12.6%

JSON

ISSUE DESCRIPTION

Allocation of pages used to communicate with external emulators did not follow certain principles that are required for proper life cycle management of guest exposed pages.

IMPACT

A compromised DM stubdomain may cause Xen to crash, resulting in a DoS (Denial of Service) affecting the entire host. Privilege escalation as well as information leaks cannot be ruled out.

VULNERABLE SYSTEMS

Only Xen 4.11 is affected by this vulnerability. Xen 4.10 and older are not affected by this vulnerability.
Only systems running HVM guests with their devicemodels in a stubdomain are considered vulnerable. Note that attackers also need to exploit the devicemodel in order to have access to this vulnerability.
Arm guests cannot leverage this vulnerability.