CVE-2021-3843 Code injection in ThinkPad BIOS
Local attackers with elevated privileges can execute arbitrary code via a vulnerability in the ThinkPad BIOS SMI function.
- 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-2021-3843?
CVE-2021-3843 is a medium-severity code injection vulnerability in Lenovo ThinkPad BIOS, published on 12 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.
Weakness: CWE-20
Which versions are affected by CVE-2021-3843?
It affects 29 products.
Products include Lenovo Thinkpad 11e 3rd Gen Firmware, Lenovo Thinkpad 11e 4th Gen Celeron Firmware, Lenovo Thinkpad 11e 4th Gen I3 Firmware, Lenovo Thinkpad 11e 4th Gen I5 Firmware, Lenovo Thinkpad 11e 4th Gen I7 Firmware, Lenovo Thinkpad 11e 5th Gen Firmware and 23 more.
How do I fix CVE-2021-3843?
No fix has been published for CVE-2021-3843 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-3843 being exploited?
There is no known exploitation of CVE-2021-3843 in the wild and no public exploit code.
Other vulnerabilities in Lenovo ThinkPad BIOS
Sources
Also known as GHSA-jv7h-3pw9-7qjw.