CVE-2021-1789 is a high-severity type confusion vulnerability affecting multiple Apple products including macOS, iOS, and Safari. This vulnerability allows processing of maliciously crafted web content, which may lead to arbitrary code execution. The CVSS score for this vulnerability is 8.8, indicating a significant risk to organizations that utilize these systems. The exploitation status is currently classified as known exploitation, making immediate action imperative.
Organizations should prioritize patching immediately to mitigate the associated risks. The vulnerability has been addressed in various updates including macOS Big Sur 11.2 and iOS 14.4. Failure to apply these updates could leave systems open to exploitation, potentially resulting in unauthorized access and data breaches.
The urgency for defenders is underscored by the vulnerability's inclusion in the Known Exploited Vulnerabilities (KEV) catalog as of May 4, 2022. The threat landscape around this vulnerability highlights the importance of maintaining updated systems and security practices to defend against potential exploitation.
It is crucial for organizations to implement robust security measures and remain vigilant to prevent exploitation of this vulnerability and similar threats.
Vulnerability Details
The CVE-2021-1789 vulnerability is characterized as a type confusion issue that was addressed with improved state handling. The affected products include macOS, iOS, tvOS, watchOS, and Safari, among others. The official description specifies that the issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4, and iPadOS 14.4, as well as Safari 14.0.3.
The CVSS 3.1 score is 8.8, indicating a high severity level. This score reflects the risk associated with the vulnerability, particularly due to its ability to impact confidentiality, integrity, and availability. The attack vector is network-based, with low complexity and no required privileges for an attacker, making it particularly dangerous.
The vulnerability is classified under CWE-843, indicating an access control issue. This classification highlights the potential for unauthorized access and manipulation of system resources by malicious actors.
Technical Analysis
The root cause of CVE-2021-1789 is a type confusion error that occurs when the state handling of objects is not properly managed. This leads to situations where an application can be misled about the type of an object, allowing it to incorrectly process data. The attack vector is network-based, meaning that an attacker can exploit this vulnerability remotely by sending specially crafted web content to the target.
Given that the attack complexity is low, an attacker can execute the exploit without extensive preparation. While no privileges are required for exploitation, user interaction is necessary, meaning that a user must engage with the malicious content for the attack to succeed.
The impacts of this vulnerability are significant: it can lead to high confidentiality, integrity, and availability impacts. Successful exploitation may allow an attacker to execute arbitrary code, potentially leading to further system compromise.
Risk & Impact Analysis
The real-world deployment risk of CVE-2021-1789 is substantial due to its ability to be exploited through network vectors. Organizations utilizing affected Apple products face a significant blast radius, as the vulnerability affects multiple operating systems and devices. This interconnectedness increases the potential for widespread exploitation if patches are not applied promptly.
The urgency for organizations to address this vulnerability is high, given its CVSS score of 8.8 and its classification in the KEV catalog. The ease of exploitation combined with the potential impact necessitates immediate action to implement the necessary patches and updates.
Organizations should consider this vulnerability a critical priority in their patch management processes to mitigate risks effectively.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions of Apple's operating systems and products include:
• macOS Big Sur 11.2 • Security Update 2021-001 for Catalina • Security Update 2021-001 for Mojave • iOS 14.4 • iPadOS 14.4 • tvOS 14.4 • watchOS 7.3 • Safari 14.0.3
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the available updates for their respective Apple products. Specific actions include upgrading to macOS Big Sur 11.2, iOS 14.4, and ensuring that Safari is updated to version 14.0.3.
Organizations may also consider implementing additional security measures such as restricting access to untrusted web content and monitoring for abnormal application behavior. For more comprehensive security assessments, organizations can utilize penetration testing to identify and address similar vulnerabilities.
Detection Guidance
Detection of exploitation attempts may involve monitoring for unusual network traffic patterns, particularly from untrusted sources. Additionally, organizations should analyze application logs for signs of unauthorized access or anomalies related to the execution of web content.
AppSecure Threat Intelligence Insight
CVE-2021-1789 represents a significant risk for organizations relying on Apple products. Given its inclusion in the KEV catalog and the potential for wide-ranging impacts, organizations must prioritize remediation efforts. The vulnerability underscores the need for comprehensive security practices, including regular updates, monitoring, and vulnerability assessments.
To enhance security posture, organizations should adopt a proactive approach towards vulnerabilities by conducting regular security assessments. For more information on security best practices, organizations may refer to the following resources on penetration testing methodology and vulnerability management program design to fortify defenses against emerging threats.
Additionally, organizations should stay informed about the evolving threat landscape and adjust their security strategies accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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