CVE-2025-2858 in saTECH BCU
Summary
by MITRE • 03/28/2025
Privilege escalation vulnerability in the saTECH BCU firmware version 2.1.3. An attacker with access to the CLI of the device could make use of the nice command to bypass all restrictions and elevate privileges as a superuser.
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Analysis
by VulDB Data Team • 10/16/2025
The saTECH BCU firmware version 2.1.3 contains a critical privilege escalation vulnerability that stems from improper access control mechanisms within the command line interface. This vulnerability allows an authenticated attacker with CLI access to exploit the nice command functionality to bypass existing security restrictions and escalate their privileges to superuser level. The flaw represents a significant weakness in the firmware's privilege management system, where the nice command is not properly restricted or validated, enabling unauthorized privilege elevation through legitimate system utilities.
The technical exploitation of this vulnerability occurs through the manipulation of the nice command which is typically used to adjust process priority in unix-like systems. In the affected firmware version, the implementation fails to properly validate user permissions when executing nice commands, allowing a regular user to escalate their privileges by leveraging the command's ability to modify process scheduling attributes. This creates a direct path to superuser access without proper authentication or authorization checks. The vulnerability aligns with CWE-276, which describes improper privilege management, and demonstrates how insufficient access control validation can lead to unauthorized privilege escalation.
The operational impact of this vulnerability is severe as it provides attackers with complete system control once they gain CLI access to the device. The superuser privileges gained through this escalation can be used to modify system configurations, install malicious software, access sensitive data, and potentially compromise the entire network infrastructure controlled by the affected BCU device. This vulnerability undermines the fundamental security model of the device, as it allows a low-privilege user to bypass all intended access controls and gain administrative capabilities. The threat landscape is particularly concerning given that the attack requires only basic CLI access, which may be obtained through various means including physical access, network infiltration, or credential compromise.
Mitigation strategies should focus on immediate firmware updates to address the privilege escalation flaw in the saTECH BCU firmware version 2.1.3. Organizations should implement strict access controls and limit CLI access to authorized personnel only, while also monitoring for unauthorized access attempts. Network segmentation and additional authentication layers should be deployed to reduce the attack surface. The vulnerability demonstrates the importance of proper input validation and privilege management as outlined in the mitre attack framework, specifically targeting techniques related to privilege escalation and command execution. Regular security assessments and firmware updates are essential to prevent exploitation of similar vulnerabilities in industrial control systems and network infrastructure devices.