XenSource Xen 3.4/4.0/4.1/4.2 PCI MSI Mask Bit access control

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

Summaryinfo

A vulnerability marked as problematic has been reported in XenSource Xen 3.4/4.0/4.1/4.2. Affected by this issue is some unknown functionality of the component PCI MSI Mask Bit Handler. Performing a manipulation results in access control. This vulnerability is identified as CVE-2015-4104. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as problematic has been found in XenSource Xen 3.4/4.0/4.1/4.2 (Virtualization Software). This affects an unknown code of the component PCI MSI Mask Bit Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on availability. The summary by CVE is:

Xen 3.3.x through 4.5.x does not properly restrict access to PCI MSI mask bits, which allows local x86 HVM guest users to cause a denial of service (unexpected interrupt and host crash) via unspecified vectors.

The weakness was released 06/02/2015 by Jan Beulich with SuSE as XSA-129 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2015-4104 since 05/27/2015. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 84167 (Debian DSA-3284-1 : qemu - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370035 (Citrix XenServer Security Update (CTX201145)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (103544), Tenable (84167), SecurityFocus (BID 74950†), SecurityTracker (ID 1032464†) and Vulnerability Center (SBV-50373†). Entries connected to this vulnerability are available at VDB-74497, VDB-75680, VDB-75682 and VDB-75683. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 84167
Nessus Name: Debian DSA-3284-1 : qemu - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703284
OpenVAS Name: Debian Security Advisory DSA 3284-1 (qemu - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

05/27/2015 🔍
06/02/2015 +6 days 🔍
06/02/2015 +0 days 🔍
06/02/2015 +0 days 🔍
06/03/2015 +1 days 🔍
06/03/2015 +0 days 🔍
06/03/2015 +0 days 🔍
06/03/2015 +0 days 🔍
06/04/2015 +1 days 🔍
05/20/2022 +2541 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-129
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-4104 (🔍)
GCVE (CVE): GCVE-0-2015-4104
GCVE (VulDB): GCVE-100-75681

OVAL: 🔍

X-Force: 103544 - Xen PCI MSI mask bits denial of service
SecurityFocus: 74950 - Xen CVE-2015-4104 Local Denial of Service Vulnerability
SecurityTracker: 1032464 - Xen PCI MSI Mask Bits Access Control Flaw Lets Local Guest Users Deny Service on the Host System
Vulnerability Center: 50373 - Xen 3.3.x through 4.5.x Local DoS Related to PCI MSI Mask Bits, Low

See also: 🔍

Entryinfo

Created: 06/03/2015 11:02
Updated: 05/20/2022 01:39
Changes: 06/03/2015 11:02 (78), 06/29/2017 18:14 (6), 05/20/2022 01:39 (3)
Complete: 🔍
Cache ID: 216:B1E:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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