Linux Foundation Xen up to 4.4.1 on x86 REP MOVS Acceleration Support code

CVSS Meta Temp Score
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3.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Foundation Xen up to 4.4.1 on x86. It has been classified as problematic. This impacts an unknown function of the component REP MOVS Acceleration Support. The manipulation leads to denial of service. This vulnerability is uniquely identified as CVE-2014-8867. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Linux Foundation Xen up to 4.4.1 on x86 (Virtualization Software) and classified as problematic. This issue affects an unknown code block of the component REP MOVS Acceleration Support. The manipulation with an unknown input leads to a code vulnerability. Using CWE to declare the problem leads to CWE-17. Impacted is availability.

The weakness was disclosed 11/27/2014 by Jan Beulich with SuSE as XSA-112 as confirmed advisory (Website). The advisory is shared at xenbits.xen.org. The public release has been coordinated in cooperation with Linux Foundation. The identification of this vulnerability is CVE-2014-8867 since 11/14/2014. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

Acceleration support for the "REP MOVS" instruction, when the first iteration accesses memory mapped I/O emulated internally in the hypervisor, incorrectly assumes that the whole range accessed is handled by the same hypervisor sub-component.

The vulnerability scanner Nessus provides a plugin with the ID 82621 (CentOS 5 : kernel (CESA-2015:0783)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370031 (Citrix XenServer Security Update (CTX200288)).

Applying the patch xsa112.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 (99019), Tenable (82621), SecurityFocus (BID 71331†), Secunia (SA59949†) and SecurityTracker (ID 1031274†). The entries VDB-12078, VDB-68222 and VDB-68296 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

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: Code
CWE: CWE-17
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: 82621
Nessus Name: CentOS 5 : kernel (CESA-2015:0783)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80056
OpenVAS Name: Oracle Linux Local Check: ELSA-2015-0783
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: xsa112.patch

Timelineinfo

11/14/2014 🔍
11/27/2014 +13 days 🔍
11/27/2014 +0 days 🔍
11/27/2014 +0 days 🔍
11/28/2014 +1 days 🔍
11/28/2014 +0 days 🔍
12/01/2014 +3 days 🔍
12/01/2014 +0 days 🔍
04/08/2015 +128 days 🔍
08/12/2015 +126 days 🔍
11/02/2015 +82 days 🔍
02/27/2022 +2309 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-112
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-8867 (🔍)
GCVE (CVE): GCVE-0-2014-8867
GCVE (VulDB): GCVE-100-68297

OVAL: 🔍

X-Force: 99019 - Xen REP MOVS denial of service, Low Risk
SecurityFocus: 71331 - Xen CVE-2014-8867 Denial of Service Vulnerability
Secunia: 59949 - Xen "REP MOVS" Instruction Acceleration Denial of Service Vulnerability, Not Critical
SecurityTracker: 1031274
Vulnerability Center: 54086 - Xen 3.2.x through 4.4.x Remote DoS Related to \, Medium

See also: 🔍

Entryinfo

Created: 12/01/2014 09:08
Updated: 02/27/2022 10:34
Changes: 12/01/2014 09:08 (81), 06/26/2018 08:46 (14), 02/27/2022 10:34 (3)
Complete: 🔍
Cache ID: 216:6ED:103

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