CVE-2023-40129: Potential Heap Buffer Overflow in build_read_multi_rsp of gatt_sr.cc Leading to Remote Code Execution

In this post, we're going to delve into the details of a newly uncovered vulnerability, registered as CVE-2023-40129. This vulnerability is related to a code component called "build_read_multi_rsp" found in the gatt_sr.cc file. Exploiting this vulnerability could lead to a dangerous heap buffer overflow, allowing an attacker to execute arbitrary code remotely without needing user interaction and additional execution privileges.

Code Snippet

To better understand the issue at hand, below is a snippet of the code in question, specifically from build_read_multi_rsp's implementation in the gatt_sr.cc file:

// gatt_sr.cc

void build_read_multi_rsp(...) {
    ...
    for (...) {
        ...
        if (variable_len) {
          ...
        } else {
          memcpy(p_rsp + offset, p_attr->p_value, length);
          offset += length;
        }
    }
    ...
}

The code's main functionality involves copying data from the p_attr->p_value buffer into the p_rsp buffer. However, there is no sufficient boundary check in place to ensure that the data being copied to p_rsp does not overflow the allocated buffer.

Original References

The vulnerability was identified as a result of thorough analysis by security researchers and has since been reported to the appropriate parties for further investigation and remediation. For further information, you can refer to the following authoritative sources:

- National Vulnerability Database (NVD)
- Common Vulnerabilities and Exposures (CVE)

Exploit Details

As the heap buffer overflow vulnerability lies within the build_read_multi_rsp function, remote attackers can exploit this vulnerability by crafting malicious input data that triggers the buffer overflow when build_read_multi_rsp processes the data.

An example exploit scenario could involve an attacker sending a specially-crafted multi-read request. The request may be designed to cause a buffer overflow upon processing by the build_read_multi_rsp function. As the buffer overflows, the attacker's arbitrary code may be written onto the heap, ultimately leading to remote code execution. Importantly, user interaction is not needed for exploitation.

Impact and Recommendations

The potential exploit of the CVE-2023-40129 vulnerability could have severe consequences for affected systems, as remote code execution often results in compromised system security, unauthorized access, and data theft. To safeguard against such exploits, it is crucial that developers, system administrators, and users take the necessary precautions.

In response to CVE-2023-40129, developers should

1. Implement proper boundary checks within the build_read_multi_rsp function to ensure data integrity and prevent buffer overflows

Monitor network traffic, looking for any suspicious behavior that could indicate an active exploit

3. Protect their devices by implementing strong security measures such as firewalls and anti-malware protection

By taking these steps, everyone involved can help maintain a secure software ecosystem and minimize the risk of CVE-2023-40129 being exploited in the wild.

Timeline

Published on: 10/27/2023 21:15:08 UTC
Last modified on: 10/30/2023 17:14:25 UTC