CVE-2023-32434 - Integer Overflow Vulnerability Allows Arbitrary Code Execution with Kernel Privileges

A severe security vulnerability, tracked as CVE-2023-32434, has recently been discovered and addressed in various Apple operating systems. The flaw is an integer overflow vulnerability that can be exploited by an attacker to execute arbitrary code with kernel privileges. Apple has released security patches to resolve this issue in watchOS 9.5.2, macOS Big Sur 11.7.8, iOS 15.7.7 and iPadOS 15.7.7, macOS Monterey 12.6.7, watchOS 8.8.1, iOS 16.5.1 and iPadOS 16.5.1, macOS Ventura 13.4.1. It is worth noting that Apple acknowledges that this vulnerability has been actively exploited against iOS versions before iOS 15.7.

Code Snippet

The following code snippet demonstrates a simple example of how the integer overflow vulnerability could be exploited in an application:

#include <stdio.h>
#include <stdint.h>

int main()
{
    uint32_t a = xFFFFFFFF;
    uint32_t b = 2;

    printf("Before overflow: %u\n", a);
    a += b;
    printf("After overflow: %u\n", a);

    // ... exploit logic ...

    return ;
}

Exploit Details

The CVE-2023-32434 vulnerability occurs when an integer value surpasses its maximum limit and consequently results in an overflow. Consequently, this condition can lead to unexpected behavior and potentially enable an attacker to execute arbitrary code with elevated privileges, such as kernel-level access.

To exploit this vulnerability, an attacker would typically create a malicious application or manipulate an existing app into triggering the integer overflow condition. Once the integer overflow occurs, the attacker could then execute arbitrary code with critical system-level privileges.

Links to Original References

For more information on the CVE-2023-32434 vulnerability, including affected systems and recommended actions, refer to the official Apple Security Advisory:

- Apple Security Advisory

Additionally, consider the following external resources for a better understanding of integer overflow vulnerabilities:

- Understanding Integer Overflow in C/C++
- OWASP Top Ten Project - Integer Overflow

Conclusion

In conclusion, the CVE-2023-32434 vulnerability is a critical security issue that affects various Apple operating systems. Exploitation of this flaw enables attackers to execute arbitrary code with kernel privileges. Therefore, it is crucial for users to update their devices to the latest versions of watchOS, macOS, iOS, and iPadOS to safeguard against these attacks. Furthermore, developers should double-check their code for possible integer overflows and ensure proper input validation in their applications.

Timeline

Published on: 06/23/2023 18:15:13 UTC
Last modified on: 10/25/2023 23:15:16 UTC