CVE-2018-9441 in Android
Summary
by MITRE • 12/03/2024
In sdp_copy_raw_data of sdp_discovery.cc, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is needed for exploitation.
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Analysis
by VulDB Data Team • 12/19/2024
The vulnerability identified as CVE-2018-9441 resides within the Bluetooth SDP (Service Discovery Protocol) implementation in the Chromium browser engine, specifically in the sdp_discovery.cc file. This flaw represents a classic out-of-bounds read condition that occurs during the processing of raw SDP data structures. The issue manifests when the sdp_copy_raw_data function performs an incorrect bounds check, allowing maliciously crafted SDP packets to trigger memory access violations that could expose sensitive information from the application's memory space.
The technical implementation of this vulnerability stems from improper validation of data length parameters within the SDP packet parsing routine. When the system processes Service Discovery Protocol data, it attempts to copy raw data elements from incoming packets into internal buffers without adequate verification of the source data's actual boundaries. This incorrect bounds checking allows attackers to craft specially formatted SDP records that cause the copy operation to read beyond the allocated buffer boundaries, potentially accessing adjacent memory regions containing confidential data such as stack contents, heap metadata, or other sensitive application information.
The operational impact of CVE-2018-9441 is significant despite requiring user interaction for exploitation, as it enables local information disclosure attacks that could reveal sensitive data to unauthorized parties. Attackers must first convince a user to interact with a malicious Bluetooth device or network service that sends crafted SDP packets, but once triggered, the vulnerability can expose memory contents that might include session tokens, cryptographic keys, or other confidential information. This type of vulnerability falls under CWE-129 Input Validation and the ATT&CK technique T1059 Command and Scripting Interpreter, as it represents a memory corruption vulnerability that could potentially be leveraged for more sophisticated attacks. The vulnerability's classification as a local information disclosure means that successful exploitation could compromise the confidentiality of data stored in the application's memory, potentially leading to further privilege escalation or data theft.
The exploitation of this vulnerability requires user interaction through Bluetooth device pairing or service discovery processes, making it less immediately dangerous than fully autonomous exploits but still concerning for environments where Bluetooth connectivity is prevalent. The attack vector typically involves an adversary establishing a malicious Bluetooth service that responds to SDP queries with crafted data structures designed to trigger the out-of-bounds read condition. Mitigation strategies should focus on implementing proper bounds checking mechanisms, input validation for all SDP data elements, and ensuring that the application properly handles malformed Bluetooth service discovery responses. Additionally, system administrators should consider disabling unnecessary Bluetooth functionality when not required, and users should be cautious about connecting to unknown Bluetooth devices or services. The vulnerability highlights the importance of robust memory safety practices in network protocol implementations and demonstrates how seemingly minor validation errors can lead to significant information disclosure risks.