CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
7.0 | $5k-$25k | 0.00 |
A vulnerability, which was classified as critical, was found in Xen up to 4.7.x (Virtualization Software). This affects an unknown functionality of the component EL2 Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on 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 EL2.
The bug was discovered 11/29/2016. The weakness was shared 02/27/2017 by ARM engineering personnel. (oss-sec). The advisory is shared at openwall.com. This vulnerability is uniquely identified as CVE-2016-9816 since 12/04/2016. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/28/2017). MITRE ATT&CK project uses the attack technique T1068 for this issue.
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 vulnerability database at Tenable (900039). The entries 94675, 94726, 94727 and 94728 are related to this item.
Product
Type
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 7.0VulDB 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: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
---|---|---|---|---|---|
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Access controlCWE: CWE-284 / CWE-266
ATT&CK: T1068
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
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 Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔍
Timeline
11/29/2016 🔍11/29/2016 🔍
12/04/2016 🔍
02/27/2017 🔍
02/27/2017 🔍
02/28/2017 🔍
02/28/2017 🔍
Sources
Advisory: openwall.comResearcher: ARM engineering personnel.
Status: Not defined
Confirmation: 🔍
CVE: CVE-2016-9816 (🔍)
SecurityFocus: 94581 - Xen XSA-201 Denial of Service Vulnerability
OSVDB: - CVE-2016-9816 - Xen - Denial of Service Issue
See also: 🔍
Entry
Created: 02/28/2017 10:28Changes: 02/28/2017 10:28 (73)
Complete: 🔍
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