SB2023032337 - Secure Boot Bypass in Cisco IOS XE Software for Cisco Catalyst 9300 Series Switches
Published: March 23, 2023
Security Bulletin ID
SB2023032337
Severity
Low
Patch available
YES
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) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2023-20082)
The vulnerability allows a local attacker to execute arbitrary code at boot time and break the chain of trust.
The vulnerability exists due to errors that occur when retrieving the public release key that is used for image signature verification. An attacker with physical access can modify specific variables in the Serial Peripheral Interface (SPI) flash memory and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.