CVE-2021-30877 : Vulnerability Insights and Analysis
Learn about CVE-2021-30877, an out-of-bounds read vulnerability in macOS that could lead to unexpected application termination or memory disclosure. Find out the impact, affected systems, and mitigation steps.
An out-of-bounds read vulnerability in macOS has been identified and addressed by Apple. This CVE entry provides details about the impact, affected systems, and mitigation steps.
Understanding CVE-2021-30877
CVE-2021-30877 is a security vulnerability in macOS identified by improved bounds checking to address an out-of-bounds read issue. The vulnerability could be exploited through a maliciously crafted AppleScript binary, leading to unexpected application termination or disclosure of process memory.
What is CVE-2021-30877?
CVE-2021-30877 is an out-of-bounds read vulnerability in macOS that allows attackers to exploit a flaw in AppleScript binary processing, potentially leading to application crashes or unauthorized access to sensitive information.
The Impact of CVE-2021-30877
The impact of CVE-2021-30877 includes unexpected application termination and unauthorized disclosure of process memory. Attackers could leverage this vulnerability to disrupt system stability and potentially access sensitive data stored in the affected macOS systems.
Technical Details of CVE-2021-30877
Vulnerability Description
The vulnerability arises from inadequate bounds checking in macOS Monterey 12.0.1, Security Update 2021-007 Catalina, and macOS Big Sur 11.6.1. It enables attackers to trigger an out-of-bounds read by processing a specially crafted AppleScript binary.
Affected Systems and Versions
Affected systems include macOS versions less than 12.0, less than 2021, and less than 11.6. Users running these versions are at risk of exploitation unless the necessary security updates are applied.
Exploitation Mechanism
Exploiting CVE-2021-30877 involves crafting a malicious AppleScript binary to trigger the out-of-bounds read vulnerability. By executing this binary on vulnerable macOS systems, attackers can cause application crashes or access sensitive process memory.
Mitigation and Prevention
Immediate Steps to Take
To mitigate the risks associated with CVE-2021-30877, users should update their macOS systems to the latest versions, including macOS Monterey 12.0.1, Security Update 2021-007 Catalina, and macOS Big Sur 11.6.1. Additionally, exercising caution when executing AppleScript binaries from untrusted sources is advised.
Long-Term Security Practices
In the long term, organizations and individuals should prioritize regular security updates and maintain a proactive approach to system hardening. Implementing stringent access controls and monitoring for unusual system behavior can help prevent potential exploitation of vulnerabilities like CVE-2021-30877.
Patching and Updates
Apple has released patches for CVE-2021-30877 in macOS Monterey 12.0.1, Security Update 2021-007 Catalina, and macOS Big Sur 11.6.1. Users are strongly recommended to apply these updates promptly to safeguard their systems against potential security risks.