Headline
New UEFI Firmware Vulnerabilities Impact Several Lenovo Notebook Models
Consumer electronics maker Lenovo on Tuesday rolled out fixes to contain three security flaws in its UEFI firmware affecting over 70 product models. “The vulnerabilities can be exploited to achieve arbitrary code execution in the early phases of the platform boot, possibly allowing the attackers to hijack the OS execution flow and disable some important security features,” Slovak cybersecurity
Consumer electronics maker Lenovo on Tuesday rolled out fixes to contain three security flaws in its UEFI firmware affecting over 70 product models.
“The vulnerabilities can be exploited to achieve arbitrary code execution in the early phases of the platform boot, possibly allowing the attackers to hijack the OS execution flow and disable some important security features,” Slovak cybersecurity firm ESET said in a series of tweets.
Tracked as CVE-2022-1890, CVE-2022-1891, and CVE-2022-1892, all three bugs relate to buffer overflow vulnerabilities that have been described by Lenovo as leading to privilege escalation on affected systems. Martin Smolár from ESET has been credited with reporting the flaws.
The bugs stem from an insufficient validation of an NVRAM variable called “DataSize” in three different drivers ReadyBootDxe, SystemLoadDefaultDxe, and SystemBootManagerDxe, leading to a buffer overflow that could be weaponized to achieve code execution.
This is the second time Lenovo has moved to address UEFI security vulnerabilities since the start of the year. In April, the company resolved three flaws (CVE-2021-3970, CVE-2021-3971, and CVE-2021-3972) — also discovered by Smolár — that could have been abused to deploy and execute firmware implants.
Users of impacted devices are highly recommended to update their firmware to the latest version to mitigate potential threats.
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A buffer overflow in the ReadyBootDxe driver in some Lenovo Notebook products may allow an attacker with local privileges to execute arbitrary code.
PC maker Lenovo has addressed yet another set of three shortcomings in the Unified Extensible Firmware Interface (UEFI) firmware affecting several Yoga, IdeaPad, and ThinkBook devices. "The vulnerabilities allow disabling UEFI Secure Boot or restoring factory default Secure Boot databases (incl. dbx): all simply from an OS," Slovak cybersecurity firm ESET explained in a series of tweets. UEFI