Xen up to 4.7.x HYP access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Xen up to 4.7.x and classified as problematic. This vulnerability affects unknown code of the component HYP Handler. The manipulation leads to access control. This vulnerability is documented as CVE-2016-9818. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Xen up to 4.7.x (Virtualization Software) and classified as critical. This issue affects an unknown part of the component HYP Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is availability. The summary by CVE is:

Xen through 4.7.x allows local ARM guest OS users to cause a denial of service (host crash) via vectors involving an asynchronous abort while at HYP.

The bug was discovered 11/29/2016. The weakness was released 02/27/2017 by ARM engineering personnel. (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-9818 since 12/04/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/28/2017). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 90 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 900039 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276348 (Fedora Security Update for xen (FEDORA-2016-1b868c23a9)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (900039) and SecurityFocus (BID 94581†). Entries connected to this vulnerability are available at VDB-94675, VDB-94726, VDB-94727 and VDB-94728. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
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: 900039
Nessus File: 🔍

OpenVAS ID: 865785
OpenVAS Name: Fedora Update for xen FEDORA-2016-1b868c23a9
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/29/2016 🔍
11/29/2016 +0 days 🔍
12/04/2016 +5 days 🔍
02/27/2017 +85 days 🔍
02/27/2017 +0 days 🔍
02/28/2017 +1 days 🔍
02/28/2017 +0 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: ARM engineering personnel.
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9818 (🔍)
GCVE (CVE): GCVE-0-2016-9818
GCVE (VulDB): GCVE-100-97331
SecurityFocus: 94581 - Xen XSA-201 Denial of Service Vulnerability
OSVDB: - CVE-2016-9818 - Xen - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 02/28/2017 10:29
Changes: 02/28/2017 10:29 (73)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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