Xen 4.4/4.5/4.6/4.7/4.8 Memory access control

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

A vulnerability was found in Xen 4.4/4.5/4.6/4.7/4.8 (Virtualization Software). It has been rated as critical. This issue affects some unknown processing. The manipulation with an unknown input leads to a access control vulnerability (Memory). 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 confidentiality, integrity, and availability. The summary by CVE is:

An issue (known as XSA-212) was discovered in Xen, with fixes available for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix introduced an insufficient check on XENMEM_exchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arrays.

The bug was discovered 04/04/2017. The weakness was disclosed 04/04/2017 by Jann Horn with Google Project Zero (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2017-7228 since 03/22/2017. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 99377 (Citrix XenServer multiple vulnerabilities (CTX222565)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276570 (Fedora Security Update for xen (FEDORA-2017-054729ab08)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41870), Tenable (99377) and SecurityFocus (BID 97375†). The entries VDB-247553, VDB-251712, VDB-252394 and VDB-252395 are pretty similar.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.7
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.2
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Name: Memory
Class: Access control / Memory
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 99377
Nessus Name: Citrix XenServer multiple vulnerabilities (CTX222565)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703847
OpenVAS Name: Debian Security Advisory DSA 3847-1 (xen - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

03/22/2017 🔍
04/04/2017 +13 days 🔍
04/04/2017 +0 days 🔍
04/04/2017 +0 days 🔍
04/04/2017 +0 days 🔍
04/04/2017 +0 days 🔍
04/05/2017 +1 days 🔍
04/14/2017 +9 days 🔍
11/27/2022 +2053 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Jann Horn
Organization: Google Project Zero
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7228 (🔍)
OVAL: 🔍

SecurityFocus: 97375 - Xen 'memory_exchange()' Function Incomplete Fix Privilege Escalation Vulnerability
OSVDB: - CVE-2017-7228 - Xen - Security Bypass Issue
SecurityTracker: 1038223

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 04/04/2017 22:25
Updated: 11/27/2022 07:39
Changes: 04/04/2017 22:25 (75), 08/25/2020 16:41 (11), 11/27/2022 07:39 (4)
Complete: 🔍
Cache ID: 3:AA0:103

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