CVE-2021-39808 is a high-severity vulnerability that affects Google Android versions 10, 11, and 12. This vulnerability allows a service to run in the foreground without user notification due to improper input validation in the createNotificationChannelGroup method of PreferencesHelper.java. Attackers may leverage this flaw to escalate privileges locally without needing any additional execution privileges. Notably, user interaction is not required for exploitation, making it particularly concerning.
With a CVSS score of 7.8, this vulnerability falls into the high severity category. Risk to organizations includes potential unauthorized access to sensitive information, as the vulnerability impacts confidentiality, integrity, and availability. The urgency for defenders to respond is heightened, as no user interaction is necessary for exploitation, and the flaw exists in multiple Android versions.
As of now, there are no known public exploits for CVE-2021-39808, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should remain vigilant and monitor for potential updates or exploit developments related to this vulnerability.
Organizations should prioritize patching immediately, especially given the high impact and the nature of the vulnerability that facilitates local escalation of privilege in Android devices.
Vulnerability Details
The vulnerability is described as follows: In createNotificationChannelGroup of PreferencesHelper.java, there is a possible way for a service to run in foreground without user notification due to improper input validation. This could lead to local escalation of privilege, requiring no additional execution privileges. User interaction is not needed for exploitation. The affected products include Android versions 10, 11, and 12.
Technical Analysis
The root cause of CVE-2021-39808 lies in insufficient input validation within the Android notification system, particularly in how notification channels are created. The attack vector is local, meaning that an attacker must have physical access to the device or be able to execute code on it. The attack complexity is low, as minimal privileges are required for exploitation. There is no need for user interaction, making the vulnerability easier to exploit. The impacts on confidentiality, integrity, and availability are assessed as high, as successful exploitation could allow unauthorized access to sensitive information or control over user notifications.
Risk & Impact Analysis
The real-world deployment risk of CVE-2021-39808 is significant. Given that it allows for local privilege escalation without user notification, the potential for abuse is high. Organizations that rely on Android devices must understand the implications of this vulnerability. The blast radius is potentially large, as multiple Android versions are affected, and millions of devices may still be unpatched. The urgency of this vulnerability is underscored by its high CVSS score, indicating that organizations should address it in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Google Android are affected by this vulnerability: Android 10, Android 11, and Android 12. Organizations should ensure that all devices running these versions are updated.
Mitigation & Remediation
Organizations should prioritize applying the patches provided by Google to remediate CVE-2021-39808. It is essential to upgrade to the latest version of Android that addresses this vulnerability. If patches are unavailable, temporary workarounds should be considered, such as implementing stricter input validation within applications that interact with Android's notification system. Monitoring and logging for unusual activities should also be enhanced.
Detection Guidance
To detect potential exploitation of CVE-2021-39808, organizations should monitor logs for unusual notification behavior and service interactions. Behavioral anomalies such as unauthorized background processes running without user notification should be flagged for further investigation.
AppSecure Threat Intelligence Insight
CVE-2021-39808 represents a significant risk within the Android ecosystem, highlighting the importance of robust input validation in application development. This vulnerability underlines the need for continuous security assessments, especially in high-profile environments. Organizations should enhance their security posture by implementing regular penetration testing and vulnerability management programs to address similar weaknesses proactively.
For comprehensive assessments, organizations can consider engaging in penetration testing to validate remediation efforts.
Organizations are encouraged to stay updated with best practices in application security, as outlined in our penetration testing methodology, to ensure they are prepared against evolving threats.
Lastly, understanding the impact of vulnerabilities like CVE-2021-39808 can be crucial for organizations, which can learn from such incidents to improve their overall security frameworks. For further insights, consider our vulnerability management program design guidelines.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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