CVE-2020-9901 Explained : Impact and Mitigation
Learn about CVE-2020-9901, a symlink path validation vulnerability in Apple's iOS, macOS, and tvOS. Find out how to mitigate the risk and prevent privilege escalation.
An issue existed within the path validation logic for symlinks. This issue was addressed with improved path sanitization. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8. A local attacker may be able to elevate their privileges.
Understanding CVE-2020-9901
This CVE relates to a vulnerability in the path validation logic for symlinks in Apple's operating systems.
What is CVE-2020-9901?
CVE-2020-9901 is a security vulnerability that allows a local attacker to potentially elevate their privileges by exploiting a flaw in symlink path validation.
The Impact of CVE-2020-9901
The vulnerability could be exploited by a local attacker to escalate their privileges on affected systems, posing a risk to the security and integrity of the devices.
Technical Details of CVE-2020-9901
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The issue stemmed from inadequate path validation for symlinks, which was mitigated by enhancing path sanitization procedures.
Affected Systems and Versions
The following Apple products and versions are impacted:
- iOS: Versions earlier than 13.6 and iPadOS 13.6
- macOS: Versions prior to macOS Catalina 10.15.6
- tvOS: Versions before tvOS 13.4.8
Exploitation Mechanism
The vulnerability could be exploited locally by manipulating symlinks to gain elevated privileges on the affected systems.
Mitigation and Prevention
To address and prevent the exploitation of CVE-2020-9901, consider the following steps:
Immediate Steps to Take
- Update affected devices to the patched versions: iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8
- Monitor system logs for any suspicious symlink activities
Long-Term Security Practices
- Implement the principle of least privilege to restrict user permissions
- Regularly audit and review symlink configurations and permissions
Patching and Updates
- Apply security updates and patches promptly to ensure the latest protections against vulnerabilities