CVE-2024-25985 in Android
Summary
by MITRE • 03/11/2024
In bigo_unlocked_ioctl of bigo.c, there is a possible UAF due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 08/26/2024
The vulnerability identified as CVE-2024-25985 resides within the bigo_unlocked_ioctl function of the bigo.c kernel driver, representing a critical security flaw that could enable local privilege escalation without requiring any additional execution privileges or user interaction. This issue manifests as a potential use-after-free condition that arises from the absence of proper bounds checking mechanisms within the driver's ioctl implementation. The vulnerability is particularly concerning because it operates at the kernel level where malicious actors can exploit it to gain elevated privileges and potentially compromise the entire system. The lack of user interaction requirements makes this flaw especially dangerous as it can be exploited automatically without any human intervention, effectively turning a kernel-level vulnerability into an automated attack vector.
The technical implementation of this vulnerability stems from the missing bounds check in the bigo_unlocked_ioctl function, which processes ioctl commands sent to the bigo device driver. When the driver receives certain ioctl commands, it fails to validate the size or range of input parameters before proceeding with memory operations. This absence of input validation creates a scenario where an attacker can manipulate the ioctl parameters to trigger a use-after-free condition, where freed memory is accessed or reused before proper deallocation occurs. According to CWE classification, this vulnerability maps to CWE-416 Use After Free, which is a well-documented and highly dangerous class of memory safety issues that can lead to arbitrary code execution and privilege escalation. The specific nature of the flaw suggests that the driver's memory management routines do not properly enforce boundaries on user-supplied data, allowing for potential buffer overflows or memory corruption that can be leveraged for privilege escalation.
The operational impact of CVE-2024-25985 extends beyond simple local privilege escalation, as it represents a fundamental breakdown in kernel security mechanisms that could enable attackers to bypass system protections and gain root access. Since the vulnerability does not require user interaction, it can be exploited by any local user or process that has access to the device driver interface, potentially allowing attackers to escalate privileges even in restricted environments. This flaw effectively undermines the kernel's security model and could be particularly devastating in multi-tenant environments or systems where local users might not be trusted. The exploitation of this vulnerability could lead to complete system compromise, data exfiltration, and persistent backdoor establishment, as the attacker would gain unrestricted access to all system resources and capabilities typically restricted to privileged processes. The vulnerability's location within a device driver interface makes it particularly dangerous because drivers operate with elevated privileges and have direct access to hardware and system memory.
Mitigation strategies for CVE-2024-25985 should focus on implementing proper bounds checking and input validation within the bigo_unlocked_ioctl function to prevent the use-after-free condition from occurring. System administrators should ensure that all kernel drivers undergo thorough security reviews and that proper memory management practices are enforced throughout the codebase. The implementation of kernel security features such as stack canaries, address space layout randomization, and kernel address space layout randomization could provide additional protection layers against exploitation attempts. According to ATT&CK framework, this vulnerability would be categorized under T1068, Valid Accounts, and potentially T1543, Create or Modify System Process, as the exploitation could lead to privilege escalation and process manipulation. Organizations should also consider implementing runtime monitoring and intrusion detection systems to identify potential exploitation attempts, while maintaining up-to-date kernel versions and security patches to prevent exploitation of this and similar vulnerabilities. The vulnerability highlights the importance of rigorous code review processes and security testing for kernel-level components, particularly those handling user input through ioctl interfaces, as these represent high-value targets for attackers seeking to establish persistent access to systems.