CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.4	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in Linux Foundation Xen 4.3. This impacts an unknown function of the component Multiple Hypercall Implementations. Performing a manipulation results in improper authentication. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Foundation Xen 4.3 (Virtualization Software). This affects some unknown processing of the component Multiple Hypercall Implementations. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, and integrity.

The weakness was presented 12/10/2013 by Jan Beulich and Don Slutz as Xen Security Advisory 77 - Disaggregated domain management security status as confirmed mailinglist post (oss-sec). The advisory is shared at seclists.org. The public release was coordinated in cooperation with Linux Foundation. The mailinglist post contains:

However the several affected hypercall implementations were originally written to be used only by the totally-privileged dom0, and have not been reviewed for security when exposed to supposedly-only-semi-privileged disaggregated management domains. But such management domains are (in such a design) to be seen as potentially hostile, e.g. due to privilege escalation following exploitation of a bug in the management domain. As a result, the potential security benefits of toolstack disaggregation are not always fully realised. This constitutes a breach of the enhanced security promises implied by the Xen APIs in Xen in 4.3 and later.

An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

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 OSVDB (100854†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Virtualization Software

Vendor

• Linux Foundation

Name

• Xen

Version

• 4.3

License

• open-source

Website

• Vendor: https://www.linuxfoundation.org/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.4
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

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: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/10/2013 🔍
12/13/2013 +3 days 🔍
05/16/2018 +1615 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: Xen Security Advisory 77 - Disaggregated domain management security status
Researcher: Jan Beulich, Don Slutz
Status: Confirmed
Coordinated: 🔍

GCVE (VulDB): GCVE-100-11493
OSVDB: 100854

Entryinfo

Created: 12/13/2013 10:20
Updated: 05/16/2018 09:08
Changes: 12/13/2013 10:20 (43), 05/16/2018 09:08 (2)
Complete: 🔍
Committer:
Cache ID: 216:FDD:103

Discussion

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