CVE-2021-3786 Information disclosure in Notebook and ThinkPad BIOS
An attacker can exploit an SMI callback flaw in Lenovo BIOS to leak sensitive data from SMRAM, requiring firmware updates to mitigate.
- 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-2021-3786?
CVE-2021-3786 is a medium-severity vulnerability in Lenovo Notebook and 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 callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.
Weakness: CWE-20
Which versions are affected by CVE-2021-3786?
It affects 133 products.
Products include Lenovo Ideapad S940-14iwl Firmware, Lenovo Ideapad Yoga S940-14iwl Firmware, Lenovo Thinkpad 10 Firmware, Lenovo Thinkpad 11e 3rd Gen Firmware, Lenovo Thinkpad 11e 4th Gen Firmware, Lenovo Thinkpad 11e Yoga Gen 6 Firmware and 127 more.
How do I fix CVE-2021-3786?
No fix has been published for CVE-2021-3786 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-3786 being exploited?
There is no known exploitation of CVE-2021-3786 in the wild and no public exploit code.
Other vulnerabilities in Lenovo Notebook and ThinkPad BIOS
Sources
Also known as GHSA-mxm2-jrgh-833g.