// For flags

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

1
*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.

XNU POSIX has an issue where shared memory mapping have an incorrect maximum protection.

*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
  • 2024-03-27 EPSS Updated
  • 2024-08-05 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-20: Improper Input Validation
CAPEC
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