XenSource Xen 4.4.x/4.5.x/4.6.x/4.7.x on x86 sh_ctxt memory corruption

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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in XenSource Xen 4.4.x/4.5.x/4.6.x/4.7.x on x86. Affected by this vulnerability is the function sh_ctxt. Such manipulation leads to memory corruption. This vulnerability is listed as CVE-2016-7094. The attack must be carried out locally. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in XenSource Xen 4.4.x/4.5.x/4.6.x/4.7.x on x86 (Virtualization Software). Affected by this issue is the function sh_ctxt. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. CVE summarizes:

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update.

The weakness was presented 09/08/2016 by Andrew Cooper (Shadow) with Citrix as XSA-187 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability is handled as CVE-2016-7094 since 08/25/2016. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 93413 (Debian DLA-614-1 : xen 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 and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276119 (Fedora Security Update for xen (FEDORA-2016-1d8429b89f)).

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 Tenable (93413), SecurityFocus (BID 92864†) and SecurityTracker (ID 1036753†). See VDB-91386, VDB-91387 and VDB-91389 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.1
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.1
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 93413
Nessus Name: Debian DLA-614-1 : xen security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 900325
OpenVAS Name: Fedora Update for xen FEDORA-2016-7d2c67d1f5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

08/25/2016 🔍
09/08/2016 +14 days 🔍
09/08/2016 +0 days 🔍
09/08/2016 +0 days 🔍
09/09/2016 +1 days 🔍
09/09/2016 +0 days 🔍
09/12/2016 +3 days 🔍
09/21/2016 +9 days 🔍
04/12/2019 +933 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-187
Researcher: Andrew Cooper (Shadow)
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-7094 (🔍)
GCVE (CVE): GCVE-0-2016-7094
GCVE (VulDB): GCVE-100-91388

OVAL: 🔍

SecurityFocus: 92864 - Xen CVE-2016-7094 Local Denial of Service Vulnerability
SecurityTracker: 1036753

See also: 🔍

Entryinfo

Created: 09/09/2016 10:39
Updated: 04/12/2019 10:33
Changes: 09/09/2016 10:39 (75), 04/12/2019 10:33 (13)
Complete: 🔍
Cache ID: 216:B78:103

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