CVE-2021-25489 is a low-severity vulnerability affecting Samsung's Android devices, specifically within the modem interface driver. The vulnerability arises from a lack of input validation, which, if radio permission is gained, can lead to a format string bug causing a kernel panic.
The vulnerability has a CVSS score of 3.3, indicating a low severity level. However, the potential for a kernel panic poses a significant risk to device availability, which is critical for end-users relying on mobile functionalities.
Given the nature of this vulnerability, it is essential for organizations using affected devices to address this issue promptly. The urgency is underscored by the potential for exploitation, even though no public exploits have been confirmed.
Organizations should prioritize patching immediately to prevent any potential disruptions caused by this kernel panic vulnerability.
Vulnerability Details
The vulnerability is classified as a format string bug, specifically due to improper input validation in the modem interface driver prior to the SMR Oct-2021 Release 1. According to the CVSS metrics, the attack vector is local, requiring low complexity, and operates without user interaction.
The vulnerability affects various Android versions, including versions 8.1, 9.0, 10.0, and 11.0, with specific patches available in subsequent security updates. The issue was disclosed on October 6, 2021, and is associated with CWE-20 (Improper Input Validation) and CWE-134 (Uncontrolled Format String).
Technical Analysis
The root cause of CVE-2021-25489 is the improper validation of input in the modem interface driver, which can be exploited if an attacker gains radio permission. This vulnerability allows attackers to manipulate the input, leading to unexpected behavior in the system, such as a kernel panic.
The attack vector is local, meaning an attacker must have physical access to the device or must be on the same local network. The attack complexity is low, as it does not require advanced skills. Only low privileges are needed to exploit this vulnerability, and no user interaction is necessary.
The impact of this vulnerability is primarily on availability, as it can lead to a kernel panic, rendering the device temporarily non-operational. There are no impacts on confidentiality or integrity as defined in the CVSS metrics.
Risk & Impact Analysis
Risk to organizations includes potential device downtime and disruption of service due to the kernel panic that may occur if the vulnerability is exploited. The availability impact is categorized as low according to CVSS, but the real-world implications can be more severe, especially for organizations relying on mobile devices for critical operations.
Given the vulnerability's presence in multiple Android versions and the low requirements for exploitation, organizations should address this issue as part of their urgent patching cycle. Failure to do so may expose them to unnecessary risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include various releases of Android from 8.1 to 11.0, specifically those released prior to the SMR Oct-2021 Release 1. Devices running these specific versions without the necessary patches are vulnerable to this issue.
Mitigation & Remediation
Organizations should apply the necessary patches provided by Samsung as per the vendor's instructions to mitigate this vulnerability. If updates are unavailable, discontinuing use of affected devices should be considered. Additionally, implementing configuration hardening and network controls may help minimize exposure to potential exploits.
For further information on best practices for security testing, organizations can refer to our guide on penetration testing services.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual modem interactions, unexpected kernel panics, and other behavioral anomalies that may indicate an attack. Implementing network signatures that identify such behaviors can enhance detection capabilities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-25489 lies in the importance of input validation in mobile device security. This vulnerability highlights the critical need for robust validation mechanisms within the modem interface driver and similar components to prevent kernel panics and other disruptions.
This case serves as a reminder for security teams to continuously assess their devices and ensure timely updates are applied. Furthermore, it underscores the importance of establishing a proactive approach to security, particularly in the ever-evolving landscape of mobile technology.
For more insights on securing mobile applications, refer to our resources on mobile app penetration testing and the latest trends in security assessments.
Additionally, understanding the implications of this vulnerability can aid organizations in developing better strategies for vulnerability management programs that address similar risks in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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