CVE-2021-25490 : What You Need to Know

A keyblob downgrade attack in keymaster prior to SMR Oct-2021 Release 1 allows an attacker to trigger IV reuse vulnerability with a privileged process.

Understanding CVE-2021-25490

This CVE affects Samsung Mobile Devices and has a CVSS base score of 6 with a medium severity rating.

What is CVE-2021-25490?

The vulnerability involves a keyblob downgrade attack in keymaster, enabling an attacker to exploit IV reuse vulnerability with a privileged process.

The Impact of CVE-2021-25490

The vulnerability has a high impact on confidentiality and integrity, requiring high privileges to exploit. It poses a risk of unauthorized access to sensitive information.

Technical Details of CVE-2021-25490

The following technical details outline the vulnerability.

Vulnerability Description

A keyblob downgrade attack in keymaster before SMR Oct-2021 Release 1 permits an attacker to trigger an IV reuse vulnerability using a privileged process.

Affected Systems and Versions

Samsung Mobile Devices with versions P(9.0), Q(10.0), R(11.0) are affected prior to SMR Oct-2021 Release 1.

Exploitation Mechanism

The attack complexity is rated as high with a local attack vector, requiring no user interaction.

Mitigation and Prevention

To safeguard against CVE-2021-25490, consider the following mitigation strategies.

Immediate Steps to Take

Ensure the affected Samsung Mobile Devices are updated to SMR Oct-2021 Release 1 or later to patch the vulnerability.

Long-Term Security Practices

Implement proper authentication mechanisms to prevent keyblob downgrade attacks and IV reuse vulnerabilities.

Patching and Updates

Regularly check for security updates from Samsung Mobile and promptly apply them to protect against known vulnerabilities.