CVE-2004-0834 in Linux
Summary
by MITRE
Format string vulnerability in Speedtouch USB driver before 1.3.1 allows local users to execute arbitrary code via (1) modem_run, (2) pppoa2, or (3) pppoa3.
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Analysis
by VulDB Data Team • 06/02/2019
The vulnerability identified as CVE-2004-0834 represents a critical format string flaw within the Speedtouch USB driver software, specifically affecting versions prior to 1.3.1. This type of vulnerability falls under the category of CWE-134, which describes format string vulnerabilities where attacker-controlled data is used as a format string parameter to functions such as printf, sprintf, or fprintf without proper validation. The affected driver components include modem_run, pppoa2, and pppoa3 functions, all of which are part of the network connectivity stack for USB broadband devices manufactured by Speedtouch.
The technical exploitation of this vulnerability occurs when local users can manipulate input data that gets processed through these specific driver functions. When the driver processes user-supplied data through format string functions without proper sanitization, it allows attackers to inject format specifiers that can lead to memory corruption, information disclosure, or arbitrary code execution. The attack vector is particularly concerning because it requires only local user privileges, meaning any user with access to the system can potentially exploit this vulnerability. The flaw manifests in the way these specific functions handle user input, creating opportunities for attackers to overwrite memory locations, redirect program execution flow, or extract sensitive information from the system's memory.
From an operational perspective, this vulnerability poses significant risks to systems running affected Speedtouch USB drivers, particularly in enterprise environments where multiple users may have local access to devices. The impact extends beyond simple privilege escalation as the arbitrary code execution capability allows attackers to gain full control over the affected system. The vulnerability affects the core functionality of USB broadband connectivity, making it particularly dangerous for systems that rely heavily on such connectivity for operations. Organizations using these drivers in critical infrastructure or network access points face heightened risk of unauthorized access and potential system compromise.
Security mitigations for this vulnerability primarily focus on immediate remediation through driver updates to version 1.3.1 or later, which contain proper input validation and format string handling. System administrators should implement comprehensive patch management processes to ensure all affected devices receive the necessary updates promptly. Additional protective measures include restricting local user privileges where possible, implementing network segmentation to limit potential attack surfaces, and monitoring for suspicious activities that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation in device drivers and aligns with ATT&CK technique T1068, which covers local privilege escalation through exploitation of software vulnerabilities. Organizations should also consider implementing runtime application protection measures and regular security assessments of device drivers to identify similar vulnerabilities before they can be exploited by malicious actors.