CVE-2020-7456 Explained : Impact and Mitigation
Learn about CVE-2020-7456, a critical out-of-bounds read/write vulnerability in FreeBSD that allows attackers with physical USB access to execute malicious code. Find mitigation steps and preventive measures here.
In FreeBSD 12.1-STABLE before r361918, 12.1-RELEASE before p6, 11.4-STABLE before r361919, 11.3-RELEASE before p10, and 11.4-RC2 before p1, an invalid memory location may be used for HID items if the push/pop level is not restored within the processing of that HID item allowing an attacker with physical access to a USB port to be able to use a specially crafted USB device to gain kernel or user-space code execution.
Understanding CVE-2020-7456
This CVE involves an out-of-bounds read/write vulnerability in FreeBSD.
What is CVE-2020-7456?
CVE-2020-7456 is a security vulnerability in FreeBSD that allows an attacker with physical access to a USB port to exploit an invalid memory location, potentially leading to kernel or user-space code execution.
The Impact of CVE-2020-7456
The vulnerability could be exploited by a malicious actor with physical access to a USB port, enabling them to execute arbitrary code on the affected system.
Technical Details of CVE-2020-7456
This section provides more technical insights into the vulnerability.
Vulnerability Description
The issue arises from the improper handling of HID items in FreeBSD, which could result in the misuse of an invalid memory location.
Affected Systems and Versions
- FreeBSD 12.1-RELEASE before p6
- FreeBSD 11.3-RELEASE before p10
- FreeBSD 11.4-RC2 before p1
Exploitation Mechanism
The vulnerability can be exploited by utilizing a specially crafted USB device to manipulate HID items and gain unauthorized code execution.
Mitigation and Prevention
Protecting systems from CVE-2020-7456 requires immediate action and long-term security measures.
Immediate Steps to Take
- Apply the necessary patches provided by FreeBSD to address the vulnerability.
- Monitor USB device connections to prevent unauthorized access.
Long-Term Security Practices
- Implement strict access controls to limit physical access to USB ports.
- Regularly update and patch systems to mitigate potential security risks.
Patching and Updates
Ensure that FreeBSD systems are updated to versions that include the necessary patches to fix the vulnerability.