CVE-2018-4435

Apple macOS shm Uninitialized Data Information Disclosure Vulnerability

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A logic issue was addressed with improved restrictions. This issue affected versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, watchOS 5.1.2.

Se abordó un problema de lógica con restricciones mejoradas. Este problema afectaba a iOS en versiones anteriores a la 12.1.1; macOS Mojave en versiones anteriores a la 10.14.2; tvOS en versiones anteriores a la 12.1.1 y watchOS en versiones anteriores a la 5.1.2.

This vulnerability allows local attackers to disclose sensitive information on vulnerable installations of Apple macOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of the shared memory module (shm). The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges in the context of the kernel.

macOS Mojave 10.14.2, Security Update 2018-003 High Sierra, Security Update 2018-006 Sierra are now available and addresses denial of service vulnerabilities.

*Credits: Juwei Lin(@panicaII) and Junzhi Lu of TrendMicro Mobile Security Team

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-01-02 CVE Reserved
2018-12-06 CVE Published
2018-12-11 First Exploit
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC
https://packetstorm.news/files/id/150729	2018-12-11
https://www.exploit-db.com/exploits/45960	2018-12-11

URL	Date	SRC

URL	Date	SRC
https://support.apple.com/kb/HT209340	2019-04-05
https://support.apple.com/kb/HT209341	2019-04-05
https://support.apple.com/kb/HT209342	2019-04-05
https://support.apple.com/kb/HT209343	2019-04-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apple Search vendor "Apple"		Iphone Os Search vendor "Apple" for product "Iphone Os"				< 12.1.1 Search vendor "Apple" for product "Iphone Os" and version " < 12.1.1"		-		Affected
Apple Search vendor "Apple"		Mac Os X Search vendor "Apple" for product "Mac Os X"				< 10.14.2 Search vendor "Apple" for product "Mac Os X" and version " < 10.14.2"		-		Affected
Apple Search vendor "Apple"		Tvos Search vendor "Apple" for product "Tvos"				< 12.1.1 Search vendor "Apple" for product "Tvos" and version " < 12.1.1"		-		Affected
Apple Search vendor "Apple"		Watchos Search vendor "Apple" for product "Watchos"				< 5.1.2 Search vendor "Apple" for product "Watchos" and version " < 5.1.2"		-		Affected