CVE-2023-30689 in Smart Phone
Summary
by MITRE • 08/10/2023
Out-of-bounds Write in BuildOemEmbmsGetSigStrengthResponse of libsec-ril prior to SMR Aug-2023 Release 1 allows local attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 09/05/2023
The vulnerability identified as CVE-2023-30689 represents a critical out-of-bounds write flaw within the BuildOemEmbmsGetSigStrengthResponse function of the libsec-ril library. This issue affects Android devices prior to the SMR August 2023 security release, creating a significant attack surface for local adversaries who can exploit this weakness to achieve arbitrary code execution. The vulnerability resides in the telecommunications radio interface layer implementation that handles embedded multimedia broadcast multicast service signaling strength responses, making it particularly dangerous in mobile environments where such functionality is essential for network operations.
The technical implementation flaw stems from inadequate bounds checking within the BuildOemEmbmsGetSigStrengthResponse function, which processes signal strength data from multimedia broadcast multicast service implementations. When malformed or excessively large input data is processed by this function, the code fails to validate array boundaries before writing data to memory locations, resulting in a buffer overflow condition. This particular vulnerability falls under the CWE-787 Out-of-bounds Write classification, where an attacker can manipulate memory layout to overwrite adjacent data structures or executable code. The flaw is particularly concerning as it operates within a privileged system library that interfaces directly with radio hardware and network protocols, providing attackers with elevated privileges.
Operationally, this vulnerability enables local attackers to execute arbitrary code with the privileges of the affected system component, potentially compromising the entire device. The exploitation requires local system access, which can be achieved through various attack vectors including malicious applications or compromised device components. Once exploited, the attacker gains the ability to modify system behavior, extract sensitive information, or establish persistent access to the device. The impact extends beyond individual device compromise as this vulnerability affects the underlying radio interface layer, potentially enabling attackers to manipulate network communications, intercept data, or disable security features. According to ATT&CK framework, this vulnerability maps to T1068 Local Privilege Escalation and T1547 Persistence techniques, as it allows for privilege elevation and potential long-term access to compromised systems.
Mitigation strategies for CVE-2023-30689 primarily involve applying the security patches released in the SMR August 2023 update, which includes fixed versions of the libsec-ril library with proper bounds checking mechanisms. Organizations should prioritize immediate deployment of these patches across all affected devices and systems, particularly those handling sensitive communications or operating in high-risk environments. Additionally, implementing runtime monitoring and anomaly detection systems can help identify potential exploitation attempts before they succeed. Device manufacturers should conduct thorough security testing of all telecommunications interface components and establish secure coding practices that emphasize bounds checking and input validation. Network administrators should also consider implementing network segmentation and monitoring to detect unusual signaling patterns that might indicate exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against similar flaws in telecommunication and radio interface implementations.