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4.0	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Linux Foundation Xen and classified as critical. Affected is an unknown function of the component Guest Hypercall Privilege Check. This manipulation causes access control. The identification of this vulnerability is CVE-2013-4554. Furthermore, there is an exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Linux Foundation Xen (Virtualization Software). It has been declared as critical. Affected by this vulnerability is an unknown part of the component Guest Hypercall Privilege Check. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

Xen 3.0.3 through 4.1.x (possibly 4.1.6.1), 4.2.x (possibly 4.2.3), and 4.3.x (possibly 4.3.1) does not properly prevent access to hypercalls, which allows local guest users to gain privileges via a crafted application running in ring 1 or 2.

The weakness was shared 11/26/2013 by Jan Beulich with SuSE as Xen Security Advisory 76 - Hypercalls exposed to privilege rings 1 and 2 of HVM guests as confirmed mailinglist post (oss-sec). The advisory is shared at seclists.org. The vendor cooperated in the coordination of the public release. This vulnerability is known as CVE-2013-4554 since 06/12/2013. An attack has to be approached locally. A single authentication is necessary for exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

After immediately, there has been an exploit disclosed. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 72986 (CentOS 5 : kernel (CESA-2014:0285)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370041 (Citrix XenServer Security Update (CTX140038)).

Applying the patch Xen Security Advisory 76 - Hypercalls exposed to privilege rings 1 and 2 of HVM guests is able to eliminate this problem. The bugfix is ready for download at seclists.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (89314), Tenable (72986), SecurityFocus (BID 63931†), OSVDB (100386†) and Vulnerability Center (SBV-42567†). The entry VDB-11071 is related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Virtualization Software

Vendor

• Linux Foundation

Name

• Xen

Version

• 3.0.3
• 3.0.4
• 3.1.3
• 3.1.4
• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.3.0
• 3.3.1
• 3.3.2
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6.1
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.3.0
• 4.3.1

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: 4.0

VulDB Base Score: 4.4
VulDB Temp Score: 4.0
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: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 72986
Nessus Name: CentOS 5 : kernel (CESA-2014:0285)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881900
OpenVAS Name: CentOS Update for kernel CESA-2014:0285 centos5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Exploit Delay Time: 🔍

Patch: Xen Security Advisory 76 - Hypercalls exposed to privilege rings 1 and 2 of HVM guests

Timelineinfo

06/12/2013 🔍
11/26/2013 +167 days 🔍
11/26/2013 +0 days 🔍
11/26/2013 +0 days 🔍
11/26/2013 +0 days 🔍
11/26/2013 +0 days 🔍
12/02/2013 +6 days 🔍
12/15/2013 +13 days 🔍
12/24/2013 +9 days 🔍
03/14/2014 +80 days 🔍
06/26/2018 +1565 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: Xen Security Advisory 76 - Hypercalls exposed to privilege rings 1 and 2 of HVM guests
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2013-4554 (🔍)
GCVE (CVE): GCVE-0-2013-4554
GCVE (VulDB): GCVE-100-11329

OVAL: 🔍

X-Force: 89314
SecurityFocus: 63931 - Xen 'hvm_do_hypercall()' Function Local Privilege Escalation Vulnerability
OSVDB: 100386
Vulnerability Center: 42567 - Xen 3.0.3 Through 4.3.1 Remote Privilege Escalation Vulnerability due to a Flaw in the hvm_do_hypercall() Function, Medium

See also: 🔍

Entryinfo

Created: 12/02/2013 08:58
Updated: 06/26/2018 08:40
Changes: 12/02/2013 08:58 (84), 06/26/2018 08:40 (3)
Complete: 🔍
Committer:
Cache ID: 216:C67:103

Discussion

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