Linux Foundation Xen up to 4.4.0 Page Transition HVMOP_set_mem_type access control

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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Foundation Xen up to 4.4.0. It has been classified as problematic. The affected element is the function HVMOP_set_mem_type of the component Page Transition Handler. The manipulation leads to access control. This vulnerability is documented as CVE-2014-3124. There is not any exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Foundation Xen up to 4.4.0 (Virtualization Software). This issue affects the function HVMOP_set_mem_type of the component Page Transition Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is availability. The summary by CVE is:

The HVMOP_set_mem_type control in Xen 4.1 through 4.4.x allows local guest HVM administrators to cause a denial of service (hypervisor crash) or possibly execute arbitrary code by leveraging a separate qemu-dm vulnerability to trigger invalid page table translations for unspecified memory page types.

The weakness was released 04/29/2014 by Jan Beulich with SuSE as XSA-92 as confirmed advisory (Website). It is possible to read the advisory at xenbits.xenproject.org. The identification of this vulnerability is CVE-2014-3124 since 04/29/2014. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The following code is the reason for this vulnerability: 

if ( p2m_is_grant(t) )
The advisory points out:
The implementation in Xen of the HVMOP_set_mem_type HVM control operations attempts to exclude transitioning a page from an inappropriate memory type. However, only an inadequate subset of memory types is excluded.

The vulnerability scanner Nessus provides a plugin with the ID 73955 (Fedora 19 : xen-4.2.4-4.fc19 (2014-5941)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 123186 (Fedora Security Update for xen (FEDORA-2015-0331)).

Applying the patch xsa92.patch/xsa92-4.1.patch/xsa92-4.2.patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xenproject.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if ( !p2m_is_ram(t) &&
   (!p2m_is_hole(t) || a.hvmmem_type != HVMMEM_mmio_dm) )

The vulnerability is also documented in the databases at X-Force (92946), Tenable (73955), SecurityFocus (BID 67113†) and Vulnerability Center (SBV-44409†). Entries connected to this vulnerability are available at VDB-12695, VDB-13087, VDB-13429 and VDB-13468. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.4

VulDB Base Score: 6.2
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 73955
Nessus Name: Fedora 19 : xen-4.2.4-4.fc19 (2014-5941)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 867777
OpenVAS Name: Fedora Update for xen FEDORA-2014-5941
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Patch: xsa92.patch/xsa92-4.1.patch/xsa92-4.2.patch

Timelineinfo

04/29/2014 🔍
04/29/2014 +0 days 🔍
04/29/2014 +0 days 🔍
04/29/2014 +0 days 🔍
04/29/2014 +0 days 🔍
05/07/2014 +8 days 🔍
05/07/2014 +0 days 🔍
05/08/2014 +1 days 🔍
05/12/2014 +4 days 🔍
06/19/2021 +2595 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-92
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-3124 (🔍)
GCVE (CVE): GCVE-0-2014-3124
GCVE (VulDB): GCVE-100-13151

OVAL: 🔍

X-Force: 92946 - Xen HVMOP_set_mem_type denial of service, Medium Risk
SecurityFocus: 67113 - Xen 'HVMOP_set_mem_type' Operation Remote Denial of Service Vulnerability
SecurityTracker: 1030160
Vulnerability Center: 44409 - Xen 4.1 Through 4.4 Remote DoS and Host Privilege Vulnerability due to a Flaw in the HVMOP_set_mem_type Control, Medium

See also: 🔍

Entryinfo

Created: 05/07/2014 10:05
Updated: 06/19/2021 10:29
Changes: 05/07/2014 10:05 (81), 06/26/2018 08:41 (10), 06/19/2021 10:29 (2)
Complete: 🔍
Cache ID: 216:A6E:103

Be aware that VulDB is the high quality source for vulnerability data.

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