CVE-2021-39698 is a high-severity vulnerability identified within the Android kernel. This vulnerability allows for possible memory corruption due to a use after free condition in the function aio_poll_complete_work of aio.c. The implications of this vulnerability are significant, as it enables local escalation of privilege without requiring any additional execution privileges. Moreover, exploitation of this vulnerability does not necessitate user interaction, which raises the urgency for organizations to respond.
The CVSS score for this vulnerability is 7.8, categorizing it as high severity. This score reflects the potential impact of exploitation, including high confidentiality, integrity, and availability impact. Given the potential for privilege escalation, organizations utilizing affected versions of the Android kernel should take immediate action to mitigate risks.
Organizations should prioritize patching immediately. The Android team has acknowledged this vulnerability, and remediation measures have been provided through vendor advisories. By not addressing this vulnerability swiftly, organizations risk exposing critical systems to exploitation.
The vulnerability was first published on March 16, 2022, and has been modified since its initial disclosure. Continuous monitoring of advisories and timely patching practices are essential to maintaining a secure environment.
Vulnerability Details
The vulnerability is classified as a use after free issue, which is a common type of memory corruption flaw. The official description states: 'In aio_poll_complete_work of aio.c, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.' This succinctly captures the risk posed by CVE-2021-39698.
The CVSS score of 7.8 indicates a high severity level, with the following breakdown: Attack Vector (Local), Attack Complexity (Low), Privileges Required (Low), and User Interaction (None). The impacts on confidentiality, integrity, and availability are all rated as high, underscoring the critical nature of this vulnerability.
The affected product is the Android kernel, with the vulnerability identified under Android ID A-185125206. The CWE classification for this vulnerability is CWE-416, which pertains to use after free issues.
Technical Analysis
The root cause of this vulnerability stems from improper memory management within the Android kernel. Specifically, the aio_poll_complete_work function does not adequately handle the deallocation of memory, leading to a scenario where freed memory is still accessed. This can result in unpredictable behavior, including privilege escalation.
The attack vector for this vulnerability is local, meaning that an attacker must have local access to the device to exploit it. The complexity of the attack is classified as low, and the privileges required to exploit the vulnerability are also low. No user interaction is needed, allowing an attacker to execute the exploit without any additional steps.
The impacts of the vulnerability are severe, with high potential consequences for confidentiality, integrity, and availability. Organizations must be aware that successful exploitation could lead to unauthorized access and control over affected systems.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access and control over sensitive systems. Given that exploitation does not require user interaction, the risk profile is elevated, as it could be executed by an attacker with local access without needing any additional privileges. The blast radius could extend beyond individual devices, potentially impacting entire networks if exploited.
Organizations should assess the urgency based on the high CVSS score of 7.8 and the potential for exploitation. It is crucial to implement patches as soon as they are available to mitigate the associated risks. The lack of a known exploit does not diminish the urgency of addressing this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected configurations include all Android versions prior to the vendor patch. Specifically, any instance of the Android kernel that is vulnerable to this issue should be patched immediately. Organizations should verify their versions against the known vulnerable configurations.
Mitigation & Remediation
Organizations should ensure that they are applying the necessary patches to mitigate the risks associated with CVE-2021-39698. The recommended action is to update to the latest version of the Android kernel provided by Google. For those unable to apply the patch immediately, implementing configuration hardening practices may provide some level of risk mitigation.
In addition, organizations should consider implementing network controls and monitoring to detect any potential exploitation attempts. Regularly reviewing security practices and ensuring that all systems are up to date will greatly reduce the risk associated with this vulnerability. For further guidance, organizations may refer to the penetration testing services offered.
Detection Guidance
To detect potential exploitation of CVE-2021-39698, organizations should monitor logs for unusual behavior or anomalies related to memory access. Behavioral changes in applications running on the Android kernel should also be closely observed, as they may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2021-39698 highlights the importance of robust memory management within operating systems. As attackers continue to evolve their techniques, vulnerabilities like these can serve as entry points into more complex attacks. Security teams must prioritize vulnerability management and ensure that remediation processes are effective.
Organizations should also consider the implications of local privilege escalation vulnerabilities, as they can often lead to larger security breaches. By leveraging vulnerability management programs, organizations can better prepare for and respond to such vulnerabilities.
Staying informed about emerging threats and vulnerabilities is crucial. Engaging in proactive security practices, including regular audits and assessments, can help mitigate risks associated with vulnerabilities like CVE-2021-39698. Additionally, understanding the landscape of exploitation can inform security strategies to better protect systems and data.
For a deeper dive into security practices, organizations may explore resources related to penetration testing methodology and how to implement them effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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