CVE-2022-35897: insyde kernel Out-of-bounds Write

Vulnerability summary

CVE-2022-35897 is a medium (CVSS 6.8) Out-of-bounds Write vulnerability in insyde kernel. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.6% of scored vulnerabilities.

Timeline

1. 21-11-2022
   PublishedVulnerability first disclosed.
2. 30-04-2025
   Last modifiedVulnerability information updated.

Description

An stack buffer overflow vulnerability leads to arbitrary code execution issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. If the attacker modifies specific UEFI variables, it can cause a stack overflow, leading to arbitrary code execution. The specific variables are normally locked (read-only) at the OS level and therefore an attack would require direct SPI modification. If an attacker can change the values of at least two variables out of three (SecureBootEnforce, SecureBoot, RestoreBootSettings), it is possible to execute arbitrary code.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.