CVE-2018-9478 in Android
Summary
by MITRE • 11/20/2024
In process_service_attr_req and process_service_search_attr_req of sdp_server.cc, there is an out of bounds write due to a missing bounds check. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/19/2024
The vulnerability identified as CVE-2018-9478 represents a critical out-of-bounds write flaw within the Bluetooth Service Discovery Protocol (SDP) server implementation in certain software stacks. This issue manifests in two primary functions: process_service_attr_req and process_service_search_attr_req located within the sdp_server.cc source file. The flaw stems from the absence of proper bounds checking mechanisms when processing incoming SDP requests, creating a scenario where maliciously crafted packets can trigger memory corruption. The vulnerability resides in the core protocol handling logic that manages service attribute and search attribute requests, which are fundamental components of Bluetooth device discovery and service enumeration processes.
The technical nature of this vulnerability places it under CWE-129, which specifically addresses insufficient bounds checking, and more broadly aligns with CWE-787, representing out-of-bounds write conditions. From an operational perspective, this vulnerability enables remote code execution without requiring any user interaction or additional privileges, making it particularly dangerous for networked environments where Bluetooth services are exposed. The absence of user interaction requirements means that attackers can exploit this flaw through automated scanning and exploitation tools, significantly expanding the attack surface. The vulnerability affects systems where the SDP server component is active and accessible, typically including mobile devices, servers, and IoT devices that support Bluetooth connectivity and service discovery mechanisms.
The operational impact of CVE-2018-9478 extends beyond simple memory corruption, as the out-of-bounds write can potentially overwrite critical memory regions including function pointers, return addresses, or other control structures within the application's memory space. This memory corruption can lead to arbitrary code execution, allowing attackers to gain full control over the affected system. The vulnerability is particularly concerning in environments where Bluetooth services are exposed to untrusted networks or where automatic service discovery is enabled, as these scenarios provide natural attack vectors. The flaw affects the SDP server's handling of service attribute requests, which are commonly used during device pairing and service enumeration processes, making exploitation likely in various legitimate Bluetooth communication scenarios.
Security professionals should consider this vulnerability in relation to the ATT&CK framework, specifically under the T1059 technique for command and control through remote code execution, and potentially T1068 for local privilege escalation if the vulnerable system has elevated privileges. Mitigation strategies should focus on implementing proper bounds checking mechanisms within the SDP server implementation, applying security patches from software vendors, and considering network segmentation to limit exposure of Bluetooth services to untrusted networks. Additionally, monitoring for unusual SDP request patterns and implementing intrusion detection systems that can identify malformed SDP packets may help detect exploitation attempts. The vulnerability underscores the importance of secure coding practices and comprehensive input validation in protocol implementations, particularly those handling network-received data that may not be properly sanitized before processing.