CVE-2016-1797

Apple OS X fontd Sandbox Escape Vulnerability

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Apple Type Services (ATS) in Apple OS X before 10.11.5 allows attackers to bypass intended FontValidator sandbox-policy restrictions and execute arbitrary code in a privileged context via a crafted app.

Apple Type Services (ATS) en Apple OS X en versiones anteriores a 10.11.5 permite a atacantes eludir las restricciones de política de sandbox destinadas a FontValidator y ejecutar código arbitrario en un contexto privilegiado a través de una app manipulada.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple OS X. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the sandbox policy for the fontd process. The issue lies in the failure to properly ensure the FontValidator binary is either excluded from the policy, or is also sandboxed. An attacker can leverage this in conjunction with other vulnerabilities to execute code outside the context of the Safari sandbox.

*Credits: lokihardt

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-01-13 CVE Reserved
2016-05-17 CVE Published
2024-06-19 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control

CAPEC

References (5)

URL	Tag	Source
http://www.securityfocus.com/bid/90696	Vdb Entry
http://www.securitytracker.com/id/1035895	Vdb Entry
http://www.zerodayinitiative.com/advisories/ZDI-16-360	X_refsource_misc

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html	2016-12-01
https://support.apple.com/HT206567	2016-12-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apple Search vendor "Apple"		Mac Os X Search vendor "Apple" for product "Mac Os X"				<= 10.11.4 Search vendor "Apple" for product "Mac Os X" and version " <= 10.11.4"		-		Affected