Security researchers recently identified a vulnerability in D-LINK DI-8003 v16.07.26A1, one of the widely used routers on the market. The vulnerability, which has been assigned the identifier CVE-2024-52755, relates to a buffer overflow that occurs via the host_ip parameter present in the ipsec_road_asp function. This post aims to provide a comprehensive overview of this potentially dangerous vulnerability, detailing the nature and scope of the flaw, suggestions for mitigation, and sharing relevant code snippets and research material.
Vulnerability Details
To understand the potential impact of this vulnerability, it's essential to know what buffer overflow vulnerabilities are. In simple terms, a buffer overflow vulnerability occurs when a process writes data to a buffer, exceeding the buffer's capacity and causing the data to overwrite adjacent memory locations. These vulnerabilities can be exploited by attackers, allowing them to execute arbitrary code or cause a denial of service (DoS) on the affected device.
In the case of CVE-2024-52755, the D-LINK DI-8003 v16.07.26A1 router features a buffer overflow vulnerability within the ipsec_road_asp function. This function is designed to handle certain routing configurations and is called with a host_ip parameter. By supplying an overly long value to this parameter, an attacker may trigger the buffer overflow and remotely execute arbitrary code on the device.
Code Snippet
The following snippet demonstrates the critical part of the code that leads to the buffer overflow vulnerability:
int ipsec_road_asp(char *host_ip)
{
char buf[256];
...
strcpy(buf, host_ip);
...
}
As seen in the code snippet above, the strcpy function copies the host_ip parameter directly into the buf buffer without first checking the length of host_ip. Since the buf buffer's size is only 256 bytes, providing a host_ip value exceeding this length will cause a buffer overflow.
Exploit Details
The exploit involves an attacker sending a maliciously crafted HTTP request to the target device, containing an overly long host_ip parameter:
POST /goform/ipsec_road HTTP/1.1
Host: target_device_ip
Content-Type: application/x-www-form-urlencoded
Content-Length: ...
host_ip=AAAAAAAA...[more than 256 characters]...AAAAA&other_parameters...
By sending such an HTTP request, the attacker can manipulate the vulnerable ipsec_road_asp function to execute arbitrary code with the router's administrative privileges.
Original References
1. CVE-2024-52755 - NVD Details
2. Vulnerability Report on D-Link DI-8003 v16.07.26A1
Mitigation and Fixes
As of writing this post, D-Link has not released a firmware update addressing CVE-2024-52755. It's strongly recommended to monitor the D-Link Support page for any updates or patches. In the meantime, the following steps can be taken to minimize the risk of exploitation:
Conclusion
In conclusion, CVE-2024-52755 is a critical buffer overflow vulnerability that can potentially allow attackers to take control over affected D-LINK DI-8003 v16.07.26A1 routers. By understanding the vulnerability and its potential impacts, individuals and organizations can take necessary steps to protect their networks and devices. Until a firmware update is available, it's crucial to follow the suggested mitigation steps to minimize risks associated with this vulnerability.
Timeline
Published on: 11/21/2024 09:46:33 UTC
Last modified on: 11/22/2024 17:15:09 UTC