CVE-2024-29784 in Android
Summary
by MITRE • 06/14/2024
In prepare_response of lwis_periodic_io.c, there is a possible out of bounds write due to an integer overflow. 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 • 07/11/2024
The vulnerability identified as CVE-2024-29784 resides within the lwis_periodic_io.c source file, specifically in the prepare_response function where a critical integer overflow condition exists that can result in out-of-bounds write operations. This flaw represents a significant security concern as it enables local privilege escalation without requiring any additional execution privileges or user interaction for exploitation. The integer overflow occurs during the processing of periodic I/O operations, where the system fails to properly validate or constrain integer values before using them as array indices or buffer sizes. This vulnerability falls under the CWE-190 category of Integer Overflow or Wraparound, which is classified as a fundamental weakness in software design that can lead to various security implications including memory corruption and arbitrary code execution. The attack vector is particularly concerning because it operates at the kernel level where privilege escalation can result in complete system compromise, making this a high-severity issue that affects the core I/O subsystem functionality.
The technical implementation of this vulnerability involves the improper handling of integer arithmetic within the prepare_response function where calculations may exceed the maximum representable value for the integer type being used. When integer overflow occurs, the resulting value can wrap around to a small positive number or zero, which when used as an array index or buffer size parameter can cause memory corruption beyond the intended boundaries. This type of flaw typically arises when developers assume that integer operations will not overflow or fail to implement proper bounds checking mechanisms before using calculated values for memory operations. The vulnerability demonstrates a classic example of how insufficient input validation and arithmetic overflow protection can create exploitable conditions that allow attackers to manipulate memory layout and potentially execute malicious code with elevated privileges.
The operational impact of CVE-2024-29784 extends beyond simple privilege escalation as it fundamentally compromises the integrity of the system's I/O processing mechanisms. Local attackers who can trigger the vulnerable code path gain the ability to execute arbitrary code with kernel-level privileges, potentially enabling them to modify system files, install backdoors, or disable security features. This vulnerability affects systems that utilize the lwis periodic I/O framework, which is commonly found in embedded systems, real-time operating environments, and network infrastructure devices where continuous I/O monitoring and response capabilities are essential. The lack of user interaction requirement makes this vulnerability particularly dangerous as it can be exploited automatically without any human intervention, potentially allowing for automated attacks or exploitation in environments where system access is limited. This type of vulnerability aligns with the ATT&CK technique T1068 which involves the exploitation of legitimate credentials and system access to gain elevated privileges, though in this case the privilege escalation occurs through a software flaw rather than credential compromise.
Mitigation strategies for CVE-2024-29784 should focus on implementing proper integer overflow protection mechanisms within the affected source code, including bounds checking before using calculated values as array indices or buffer sizes. Developers should employ defensive programming practices such as using safe integer arithmetic libraries, implementing explicit overflow checks, and utilizing compiler flags that enable stack protection and other security features. The recommended approach involves validating all integer calculations before they are used in memory operations, ensuring that calculated values remain within acceptable ranges, and implementing proper error handling for overflow conditions. Additionally, system administrators should monitor for updates from vendors who maintain the lwis periodic I/O framework and apply patches promptly to address the integer overflow vulnerability. The fix should be implemented through proper code review processes that include security testing and static analysis to prevent similar issues from occurring in other parts of the codebase, aligning with the security development lifecycle practices that emphasize early detection and prevention of such vulnerabilities through comprehensive testing and code quality assurance measures.