CVE-2020-15577 in Samsung
Summary
by MITRE
An issue was discovered on Samsung mobile devices with P(9.0) and Q(10.0) software. Cameralyzer allows attackers to write files to the SD card. The Samsung ID is SVE-2020-16830 (July 2020).
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Analysis
by VulDB Data Team • 10/29/2020
The vulnerability identified as CVE-2020-15577 represents a critical security flaw in Samsung mobile devices running Android Pie (9.0) and Q (10.0) operating systems. This issue specifically affects the Cameralyzer component which is part of Samsung's proprietary camera application framework. The vulnerability stems from inadequate permission controls and file system access restrictions within the camera subsystem, allowing malicious actors to exploit write access to external storage media. The Samsung internal tracking identifier SVE-2020-16830 was assigned to this vulnerability in July 2020, indicating the company's recognition of the severity and the timeline of the security assessment.
The technical implementation of this vulnerability resides in the improper handling of file system permissions within the camera application's file writing mechanisms. Attackers can leverage this flaw to bypass normal security restrictions that typically prevent applications from writing arbitrary files to external storage locations. This occurs through manipulation of the camera application's internal processes that handle media file storage and processing. The vulnerability essentially allows unauthorized file creation and modification operations on the SD card, which represents a significant breach of the device's security model and file system isolation principles. The flaw operates at the application level and does not require root privileges or elevated system access to exploit, making it particularly dangerous for end users.
The operational impact of this vulnerability extends beyond simple unauthorized file creation. It creates potential attack vectors for malicious actors to establish persistence mechanisms on affected devices, deliver malware payloads, or manipulate existing files on the SD card. The ability to write files to external storage opens possibilities for credential theft, data exfiltration, or the installation of malicious applications that can leverage the compromised storage space. From an attacker's perspective, this vulnerability aligns with techniques described in the attack pattern taxonomy, particularly those involving privilege escalation and persistence mechanisms. The vulnerability could enable adversaries to create backdoors or modify system files that are stored on the SD card, potentially affecting device functionality and user privacy. This represents a direct violation of the principle of least privilege and undermines the security boundaries that separate different application processes and user data.
Mitigation strategies for this vulnerability should focus on immediate software updates provided by Samsung through their security patches and Android security bulletins. Users should ensure their devices receive the latest security updates and firmware releases that address this specific flaw. System administrators and security professionals should implement monitoring of SD card access patterns and file creation activities on affected devices. The vulnerability demonstrates the importance of proper input validation and access control implementation, aligning with CWE categories related to improper privilege management and insufficient access control. Organizations should consider implementing additional security controls such as mobile device management solutions that can enforce secure configuration policies and monitor for anomalous file system activities. Network-level monitoring should also be enhanced to detect potential exfiltration attempts or command and control communications that might result from exploitation of this vulnerability.