Xamarin.iOS 6.2.1/6.3 Build 863 on MacOS access control

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Xamarin.iOS 6.2.1/6.3 Build 863 on MacOS. It has been classified as critical. Affected is an unknown function. This manipulation causes access control. This vulnerability appears as CVE-2017-8665. The attack requires local access. In addition, an exploit is available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Xamarin.iOS 6.2.1/6.3 Build 863 on MacOS and classified as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Xamarin.iOS update component on systems running macOS allows an attacker to run arbitrary code as root, aka "Xamarin.iOS Elevation Of Privilege Vulnerability."

The bug was discovered 08/14/2017. The weakness was presented 08/14/2017 by Yorick Koster as KB4037359 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. This vulnerability is known as CVE-2017-8665 since 05/03/2017. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

An elevation of privilege vulnerability exists when the Xamarin.iOS update component improperly handles directories and binaries. An attacker who successfully exploited this vulnerability could run arbitrary code as root. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Only systems running macOS are affected by this vulnerability.

A public exploit has been developed by Securify and been published immediately after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

Applying the patch KB4037359 is able to eliminate this problem. The bugfix is ready for download at catalog.update.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (42454) and SecurityFocus (BID 100308†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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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: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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OpenVAS ID: 800224
OpenVAS Name: Xamarin Studio Privilege Escalation Vulnerability - Mac OS X
OpenVAS File: 🔍
OpenVAS Family: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: KB4037359

Timelineinfo

05/03/2017 🔍
08/14/2017 +103 days 🔍
08/14/2017 +0 days 🔍
08/14/2017 +0 days 🔍
08/14/2017 +0 days 🔍
08/14/2017 +0 days 🔍
08/14/2017 +0 days 🔍
08/15/2017 +1 days 🔍
08/16/2017 +1 days 🔍
01/23/2025 +2717 days 🔍

Sourcesinfo

Advisory: KB4037359
Researcher: Yorick Koster
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8665 (🔍)
GCVE (CVE): GCVE-0-2017-8665
GCVE (VulDB): GCVE-100-105313
SecurityFocus: 100308 - Microsoft Xamarin Studio CVE-2017-8665 Local Privilege Escalation Vulnerability

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

Entryinfo

Created: 08/16/2017 03:49
Updated: 01/23/2025 11:55
Changes: 08/16/2017 03:49 (70), 11/09/2019 11:43 (11), 01/23/2025 11:55 (16)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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