SB2022081738 - Security Boot bypass in Linux kernel
Published: August 17, 2022
Security Bulletin ID
SB2022081738
Severity
Low
Patch available
NO
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Security features bypass (CVE-ID: CVE-2022-21505)
The vulnerability allows an attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect implementation of the IMA lockdown feature. If IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine with Secure Boot. An attacker with physical access to device can bypass Secure Boot mechanism.
Remediation
Cybersecurity Help is not aware of any official remediation provided by the vendor.