CVE-2008-3279 in brltty
Summary
by MITRE
Untrusted search path vulnerability in libbrlttybba.so in brltty 3.7.2 allows local users to gain privileges via a crafted library, related to an incorrect RPATH setting.
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Analysis
by VulDB Data Team • 05/05/2026
The vulnerability identified as CVE-2008-3279 represents a critical untrusted search path issue within the brltty accessibility software suite, specifically affecting version 3.7.2. This flaw resides in the libbrlttybba.so library component and demonstrates a classic privilege escalation vector through improper library loading mechanisms. The vulnerability stems from an incorrect RPATH configuration that allows local attackers to manipulate the library search path and inject malicious code into the privileged execution context. This issue directly impacts the security model of brltty, which serves as a bridge between screen readers and braille displays, making it a critical component in accessibility systems.
The technical exploitation of this vulnerability occurs when a local user crafts a malicious shared library that gets loaded in place of the legitimate one due to the insecure RPATH configuration. The incorrect RPATH setting causes the system to search for libraries in predictable locations where an attacker can place malicious code, bypassing normal security controls. This flaw aligns with CWE-426, which describes untrusted search path vulnerabilities where applications use insecure library loading mechanisms. The vulnerability specifically exploits the dynamic linker's behavior when resolving shared library dependencies, allowing attackers to execute arbitrary code with elevated privileges.
The operational impact of CVE-2008-3279 extends beyond simple privilege escalation to potentially compromise entire accessibility systems that rely on brltty. Since brltty operates with elevated privileges to interact with hardware devices and system resources, successful exploitation could enable attackers to gain full control over accessibility services, potentially affecting users who depend on these systems for daily operations. This vulnerability is particularly concerning in environments where brltty is used in critical infrastructure or government systems where accessibility is mandated. The attack vector requires local access but provides a pathway to privilege escalation that could be leveraged in combination with other vulnerabilities to establish persistent access.
Mitigation strategies for this vulnerability involve immediate patching of brltty to version 4.0 or later, which resolves the RPATH configuration issues. System administrators should also implement proper library path controls and consider using secure library loading mechanisms such as setting LD_PRELOAD to prevent unauthorized library loading. The remediation aligns with ATT&CK technique T1068, which covers privilege escalation through insecure library loading, and addresses the root cause by ensuring proper library resolution paths. Additionally, implementing runtime protections such as address space layout randomization and stack canaries can provide defense-in-depth measures against similar vulnerabilities. Regular security audits of library dependencies and RPATH configurations should be conducted to prevent similar issues in other software components, as this vulnerability demonstrates the critical importance of proper library loading security practices in system-level software.