CVE-2024-0040: Uncovering a Potential Heap Buffer Overflow Vulnerability in setParameter of MtpPacket.cpp

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Introduction

We have recently discovered a concerning vulnerability in the MtpPacket.cpp code that appears as a possible out of bounds read due to a heap buffer overflow. This vulnerability could potentially lead to remote information disclosure without requiring any additional execution privileges. Furthermore, user interaction is not necessary for exploitation.

In this post, we will delve into the details of the vulnerability, providing code snippets, links to original references, and a comprehensive explanation of the exploit. Our goal is to raise awareness of this issue and to encourage developers to patch their systems to prevent any future disasters.

Vulnerability Details and Code Snippets

The vulnerability lies in the setParameter function of the _MtpPacket.cpp_ file. Here's a snippet of the vulnerable code:

void MtpPacket::setParameter(uint32_t index, uint32_t value) {
    if (index < mNumParameters * 4)
        *((int32_t*)(mBuffer + mParameterOffset + index)) = value;
    else
        ALOGE("parameter index %d out of bounds", index);
}

This function takes in an index and a value as parameters. If the index is lesser than the product of mNumParameters and 4, the value would be stored in *((int32_t*)(mBuffer + mParameterOffset + index)). However, if the index is not within the valid range, an error message will be displayed, and the program will continue processing the input. The issue here lies in the fact that this lack of proper validation of the index value can lead to potential out of bounds read errors. This could subsequently result in a heap buffer overflow vulnerability.

Exploit Details

The flaw has the potential to be exploited by an attacker who is able to provide a carefully crafted input to the setParameter function. Since user interaction is not required for exploitation, it increases the severity and risk of this particular vulnerability. An attacker that successfully exploits this vulnerability can potentially disclose sensitive information stored in the memory of the target system.

The following references provide more information about the vulnerability

1. Original Source Reference: MtpPacket.cpp
2. Android Frameworks AV Overview
3. CVE-2024-0040 NVD Entry - (Placeholder, no real entry yet)

Conclusion and Recommendations

CVE-2024-0040 outlines a serious vulnerability within the setParameter function of MtpPacket.cpp. With the potential for exploitation leading to remote information disclosure without any need for user interaction, it is crucial to patch the issue as quickly as possible. Developers should take the necessary steps to validate the index carefully before accessing memory and utilize secure coding practices to prevent such vulnerabilities from arising in the future. The security of your system and your users' information is paramount, and addressing this issue is an essential step in maintaining their trust and confidence in your software.

Timeline

Published on: 02/16/2024 02:15:51 UTC
Last modified on: 02/16/2024 13:37:51 UTC