CVE-2021-25420 in Galaxy Watch PlugIn
Summary
by MITRE • 06/11/2021
Improper log management vulnerability in Galaxy Watch PlugIn prior to version 2.2.05.21033151 allows attacker with log permissions to leak Wi-Fi password connected to the user smartphone within log.
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Analysis
by VulDB Data Team • 06/14/2021
The vulnerability identified as CVE-2021-25420 represents a critical improper log management flaw affecting Samsung Galaxy Watch PlugIn software versions prior to 2.2.05.21033151. This security weakness stems from inadequate handling of sensitive information within application logs, creating an exploitable condition that could lead to credential exposure. The vulnerability specifically targets the synchronization and logging mechanisms between the Galaxy Watch device and the user's smartphone, where Wi-Fi network credentials are inadvertently captured and stored in log files accessible to unauthorized parties.
The technical implementation of this flaw involves the application's failure to properly sanitize or redact sensitive authentication data during the logging process. When the Galaxy Watch PlugIn operates in its default configuration, it maintains detailed logs that capture various system interactions including network connectivity events. These logs contain unencrypted Wi-Fi password information that is logged as part of the device pairing and connection process. The vulnerability manifests when an attacker with legitimate log access permissions can retrieve these log files and extract the plaintext Wi-Fi credentials, bypassing normal authentication mechanisms that would typically protect such sensitive information.
From an operational perspective, this vulnerability creates significant risk for end users who may unknowingly expose their network credentials to potential attackers. The attack vector requires minimal privileges since the attacker only needs log file access permissions rather than elevated system privileges or network access. This makes the vulnerability particularly dangerous in environments where log files might be accessible through legitimate administrative channels or where default configurations leave log files with overly permissive access controls. The exposure of Wi-Fi passwords through this mechanism can lead to unauthorized network access, lateral movement within corporate networks, and potential data breaches that could affect multiple connected devices and systems.
The security implications of CVE-2021-25420 align with CWE-200, which addresses the improper handling of sensitive information, and specifically relates to CWE-532, which covers the insertion of sensitive information into log files. The vulnerability also maps to ATT&CK technique T1070.004, which involves the indicator removal from tools, as the compromised logs could be used to establish persistent access and potentially hide other malicious activities. Organizations should implement immediate mitigation strategies including updating to the patched version 2.2.05.21033151, implementing strict log access controls, and conducting comprehensive log review processes to identify and remove any previously compromised sensitive information. Additionally, security teams should establish monitoring protocols to detect unauthorized access to log files and implement proper log sanitization procedures to prevent similar vulnerabilities from occurring in other applications.