CVE-2021-41837 Memory corruption in n/a
An untrusted pointer dereference in InsydeH2O BIOS allows attackers to corrupt SMRAM and escalate privileges to System Management Mode.
- 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-2021-41837?
CVE-2021-41837 is a high-severity memory corruption vulnerability in Insyde Insydeh2o, published on 3 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.
Weakness: CWE-119
Which versions are affected by CVE-2021-41837?
It affects 15 products.
Products include Insyde Insydeh2o, Siemens Simatic Field Pg M5 Firmware, Siemens Simatic Field Pg M6 Firmware, Siemens Simatic Ipc127e Firmware, Siemens Simatic Ipc227g Firmware, Siemens Simatic Ipc277g Firmware and 9 more.
How do I fix CVE-2021-41837?
No fix has been published for CVE-2021-41837 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-2021-41837 being exploited?
There is no known exploitation of CVE-2021-41837 in the wild and no public exploit code.
Other vulnerabilities in Insyde Insydeh2o
Sources
Also known as GHSA-grj6-95wm-6gmg.