CVE-2022-1892 in Notebook
Summary
by MITRE • 01/26/2023
A buffer overflow in the SystemBootManagerDxe driver in some Lenovo Notebook products may allow an attacker with local privileges to execute arbitrary code.
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Analysis
by VulDB Data Team • 02/23/2023
The vulnerability identified as CVE-2022-1892 represents a critical buffer overflow flaw within the SystemBootManagerDxe driver component of certain Lenovo notebook systems. This driver operates within the UEFI firmware environment, specifically handling boot management functions during system initialization. The flaw manifests when the driver processes untrusted input without proper bounds checking, creating an opportunity for memory corruption that can be exploited by malicious actors with local access privileges.
The technical implementation of this vulnerability stems from inadequate input validation within the SystemBootManagerDxe driver which fails to properly sanitize user-supplied data during boot process operations. When the driver receives malformed input through boot configuration parameters or firmware update mechanisms, it attempts to copy this data into fixed-size memory buffers without sufficient boundary checks. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially corrupting critical system structures or injecting malicious code that executes with elevated privileges during the boot sequence.
From an operational perspective, this vulnerability presents a significant risk to Lenovo notebook users as it requires only local access privileges to exploit, making it particularly dangerous in environments where physical access or administrative credentials might be compromised. The attack vector typically involves an attacker with local user access who can manipulate boot parameters or firmware update processes to trigger the buffer overflow condition. Once successfully exploited, the vulnerability could enable arbitrary code execution with system-level privileges, potentially allowing attackers to bypass security controls, install persistent backdoors, or modify critical system components during the boot process.
The impact of this vulnerability extends beyond simple code execution as it affects the fundamental boot integrity of affected Lenovo systems. Since the flaw exists within the UEFI driver layer, successful exploitation could compromise the entire boot process, potentially allowing attackers to establish persistent footholds that survive system reboots and traditional security measures. This makes the vulnerability particularly concerning for enterprise environments where notebook security is paramount and where attackers might leverage this weakness to establish long-term access to sensitive corporate systems.
Organizations should implement immediate mitigations including applying available firmware updates from Lenovo, which typically contain patches addressing the specific buffer overflow conditions in the affected driver. Security teams should also consider implementing runtime monitoring solutions that can detect anomalous boot process behaviors or unauthorized firmware modifications. The vulnerability aligns with CWE-121 which describes stack-based buffer overflow conditions, and represents a potential pathway for ATT&CK technique T1068 which involves exploiting local privileges to gain elevated access. Additionally, organizations should review their firmware update policies and ensure that UEFI firmware components receive regular security updates to address similar vulnerabilities that may exist in other system components.