Linux Foundation Xen 4.4.0/4.4.1 Initialization evtchn_fifo_set_pending resource management

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3.5$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Foundation Xen 4.4.0/4.4.1. This vulnerability affects the function evtchn_fifo_set_pending of the component Initialization Handler. This manipulation causes resource management. This vulnerability is tracked as CVE-2014-6268. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability has been found in Linux Foundation Xen 4.4.0/4.4.1 (Virtualization Software) and classified as problematic. Affected by this vulnerability is the function evtchn_fifo_set_pending of the component Initialization Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

The evtchn_fifo_set_pending function in Xen 4.4.x allows local guest users to cause a denial of service (host crash) via vectors involving an uninitialized FIFO-based event channel control block when (1) binding or (2) moving an event to a different VCPU.

The weakness was disclosed 09/09/2014 by Vitaly Kuznetsov with Red Hat as XSA-107 as confirmed advisory (Website). The advisory is shared at xenbits.xen.org. The public release has been coordinated in cooperation with Linux Foundation. The advisory contains:

This bug was publicly reported on xen-devel, before it was appreciated that there was a security problem.
This vulnerability is known as CVE-2014-6268 since 09/09/2014. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The advisory points out:
When using the FIFO-based event channels, there are no checks for the existence of a control block when binding an event or moving it to a different VCPU. This is because events may be bound when the ABI is in 2-level mode (e.g., by the toolstack before the domain is started).

The vulnerability scanner Nessus provides a plugin with the ID 77789 (Fedora 21 : xen-4.4.1-2.fc21 (2014-10531)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks.

Applying the patch xsa107-4.4.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 databases at X-Force (95837), Tenable (77789), SecurityFocus (BID 69685†), SecurityTracker (ID 1030829†) and Vulnerability Center (SBV-47176†). Additional details are provided at seclists.org. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.5

VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 77789
Nessus Name: Fedora 21 : xen-4.4.1-2.fc21 (2014-10531)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: xsa107-4.4.patch

Timelineinfo

09/09/2014 🔍
09/09/2014 +0 days 🔍
09/09/2014 +0 days 🔍
09/09/2014 +0 days 🔍
09/09/2014 +0 days 🔍
09/10/2014 +1 days 🔍
09/10/2014 +0 days 🔍
09/23/2014 +13 days 🔍
11/19/2014 +57 days 🔍
01/12/2015 +54 days 🔍
02/15/2022 +2591 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-107
Researcher: Vitaly Kuznetsov
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-6268 (🔍)
GCVE (CVE): GCVE-0-2014-6268
GCVE (VulDB): GCVE-100-67477
X-Force: 95837 - Xen evtchn_fifo_set_pending() denial of service, Low Risk
SecurityFocus: 69685 - Xen 'evtchn_fifo_set_pending()' Local Denial of Service Vulnerability
SecurityTracker: 1030829 - Xen Initialization Flaw in evtchn_fifo_set_pending() Lets Local Guest Systems Crash the Host System
Vulnerability Center: 47176 - Xen Local DoS due to Failure to Check for Control Block, Medium

Misc.: 🔍

Entryinfo

Created: 09/10/2014 10:59
Updated: 02/15/2022 13:27
Changes: 09/10/2014 10:59 (85), 06/12/2017 08:32 (2), 02/15/2022 13:27 (3)
Complete: 🔍
Cache ID: 216:32C:103

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