CVE-2020-27339 Memory corruption in n/a
Attackers can corrupt firmware or OS memory via improper validation in InsydeH2O SMM drivers, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-27339?
CVE-2020-27339 is a medium-severity memory corruption vulnerability in Insyde Insydeh2o, published on 16 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).
Weakness: CWE-20
Which versions are affected by CVE-2020-27339?
It affects 17 products.
Products include Insyde Insydeh2o, Siemens Ruggedcom Apr1808 Firmware, Siemens Simatic Field Pg M5 Firmware, Siemens Simatic Field Pg M6 Firmware, Siemens Simatic Ipc127e Firmware, Siemens Simatic Ipc227g Firmware and 11 more.
How do I fix CVE-2020-27339?
No fix has been published for CVE-2020-27339 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-27339 being exploited?
There is no known exploitation of CVE-2020-27339 in the wild and no public exploit code.
Other vulnerabilities in Insyde Insydeh2o
Sources
Also known as CVE-2021-41610, GHSA-67f6-6h83-3w53.