CVE-2024-25986 in Android
Summary
by MITRE • 03/11/2024
In ppmp_unprotect_buf of drm_fw.c, there is a possible compromise of protected memory due to a logic error in the code. This could lead to local escalation of privilege to TEE with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 08/28/2024
The vulnerability identified as CVE-2024-25986 resides within the drm_fw.c source file in the ppmp_unprotect_buf function, representing a critical security flaw that undermines the integrity of protected memory mechanisms. This issue manifests as a logic error that creates an exploitable condition allowing unauthorized access to memory regions that should remain protected, particularly within Trusted Execution Environments. The vulnerability specifically affects systems implementing protected memory management protocols where firmware components interact with secure memory spaces. The flaw operates at the kernel level within device driver code, making it particularly dangerous as it can be leveraged by malicious actors to bypass security boundaries that are fundamental to system protection. This type of vulnerability directly impacts the security architecture of embedded systems and mobile devices where Trusted Execution Environments are employed to isolate sensitive operations and data processing.
The technical implementation of this vulnerability stems from a flawed logic implementation within the memory protection routines that govern how protected memory buffers are handled during firmware operations. When the ppmp_unprotect_buf function executes, it contains a logical condition that fails to properly validate memory access permissions or buffer boundaries, creating a path where memory protection can be circumvented without requiring additional privileges or user interaction. The flaw likely involves improper handling of memory region flags, access control lists, or buffer size validation checks that should normally prevent unauthorized memory access. This logic error effectively creates a backdoor within the memory management subsystem that allows arbitrary code execution within the Trusted Execution Environment context. The vulnerability's classification as a local privilege escalation vector indicates that an attacker with minimal system access can leverage this flaw to gain elevated privileges without requiring additional attack vectors or execution capabilities, making it particularly concerning for security-sensitive environments.
The operational impact of CVE-2024-25986 extends beyond simple privilege escalation, as it represents a fundamental breach in the memory protection mechanisms that are essential for maintaining system security. Systems utilizing Trusted Execution Environments, such as those found in smartphones, IoT devices, and embedded systems, become vulnerable to complete compromise when this vulnerability is exploited. The absence of user interaction requirements means that exploitation can occur automatically upon system boot or during normal operation, creating a persistent threat that can be leveraged by malware or malicious actors without additional attack surface. This vulnerability directly violates the principle of least privilege and memory isolation that are core tenets of secure system design, potentially allowing attackers to access sensitive cryptographic keys, personal data, or confidential system information stored within protected memory regions. The impact is particularly severe in environments where device security is paramount, such as financial services, healthcare systems, or military applications where Trusted Execution Environments are deployed to protect against sophisticated threats.
Mitigation strategies for CVE-2024-25986 must address the root cause through immediate code patches that correct the logic error in the ppmp_unprotect_buf function. System administrators should prioritize updating firmware and kernel components to versions that contain the necessary security fixes, as this vulnerability affects the foundational memory protection mechanisms. Organizations should implement comprehensive vulnerability management procedures that include monitoring for similar logic errors in related code components and conducting thorough security assessments of memory management routines. The mitigation approach should also include network segmentation and access controls to limit potential exploitation vectors, though these measures are secondary to the core code-level fixes. Security teams should monitor for indicators of compromise related to this vulnerability and implement intrusion detection systems that can identify attempts to exploit memory protection bypass mechanisms. This vulnerability aligns with CWE-252, which addresses "Unchecked Return Value," and may also relate to ATT&CK technique T1068, "Exploitation for Privilege Escalation," making it a critical target for both preventive and detective security controls. The patching process should be carefully coordinated to ensure that firmware updates do not introduce compatibility issues while maintaining the security integrity of the protected memory subsystems.