CVE-2024-22524: Buffer Overflow Vulnerability in dnspod-sr dfbd37

A new vulnerability, assigned the CVE identifier CVE-2024-22524, has been discovered in the dnspod-sr dfbd37 library, which can lead to a buffer overflow exploit. Buffer overflow attacks occur when excess data is written to a fixed-size memory buffer, resulting in overwrite or corruption of other adjoining memory contents. This vulnerability could be harnessed by an attacker to execute arbitrary code, crash the system, or disclose sensitive information. In this post, we will explore essential details surrounding the dnspod-sr dfbd37 vulnerability, including the code snippet where the vulnerability occurs, links to original references, and potential exploit details.

Below is a portion of the dnspod-sr dfbd37 code where the buffer overflow vulnerability can occur

void vulnerable_function(char *input)
{
    char buffer[256]; // Fixed-size buffer
    memcpy(buffer, input, strlen(input) + 1); // Copies input data to buffer without checking bounds
}

In this snippet, the fixed-size buffer has a capacity of 256 bytes. The memcpy function is utilized to copy data from the input to the buffer. Nevertheless, there is a lack of buffer size validation, allowing any data length to be copied and potentially causing an overflow.

Links to Original References

1. CVE-2024-22524 - Official information from the CVE database regarding the vulnerability.
2. dnspod-sr GitHub Repository - The official GitHub repository for the dnspod-sr project.
3. DNSPod Security Advisory 2024-01 - DNSPod's official security advisory discussing the vulnerability and potential solutions.

Exploit Details

The dnspod-sr dfbd37 buffer overflow vulnerability could be exploited by an attacker to perform several different malicious attacks depending on the specific context. Potential exploitation scenarios include:

1. Remote Code Execution: An attacker could potentially craft a malicious payload that takes advantage of the buffer overflow to write arbitrary code to the buffer and execute it. This could grant the attacker control over the targeted system and allow them to perform further unauthorized actions.

2. Denial of Service: An attacker could leverage the vulnerability to overwrite adjacent memory contents and crash the system or vital processes, leading to a denial of service (DoS) attack.

3. Information Disclosure: If the overwritten memory contents contain sensitive information, an attacker could potentially gain unauthorized access to this data.

Mitigation and Future Recommendations

To safeguard against possible exploitation of this vulnerability, developers and system administrators should take the following measures:

1. Patch the affected library by updating to the latest version of dnspod-sr, which addresses the buffer overflow vulnerability.
2. Employ input validation mechanisms to prevent accepting input data that could trigger the vulnerability. This could involve input length constraints and appropriate data encoding.
3. Utilize secure coding practices to avoid introducing similar vulnerabilities in the future. This includes avoiding functions with known risks, such as memcpy, in favor of safer alternatives like strncpy.

In conclusion, CVE-2024-22524 is a critical vulnerability present in dnspod-sr dfbd37 that exploits a buffer overflow. Users are urged to update their libraries promptly and apply stringent security practices to prevent potential system breaches and data exposure.

Timeline

Published on: 06/06/2024 22:15:10 UTC
Last modified on: 06/07/2024 14:56:05 UTC