Source: cna@vuldb.com
A flaw has been found in UTT 进取 512W 1.7.7-171114. This affects the function strcpy of the file /goform/formFtpServerDirConfig. Executing manipulation of the argument filename can lead to buffer overflow. The attack can be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Critical vulnerability discovered in UTT 进取 512W routers allows for remote code execution due to a buffer overflow in the strcpy function. Attackers can exploit this flaw by sending a crafted request to the vulnerable /goform/formFtpServerDirConfig endpoint, potentially leading to complete system compromise and data exfiltration. The vendor has not responded, leaving affected devices exposed to attack.
Step 1: Target Identification: The attacker identifies a vulnerable UTT 进取 512W router running version 1.7.7-171114 accessible over the network.
Step 2: Request Crafting: The attacker crafts a malicious HTTP POST request to the /goform/formFtpServerDirConfig endpoint. This request includes a filename parameter with a string exceeding the allocated buffer size.
Step 3: Payload Delivery: The crafted filename string, containing the overflow payload, is sent to the router.
Step 4: Buffer Overflow Trigger: The router's web server receives the request and calls the vulnerable strcpy function to copy the oversized filename into the buffer.
Step 5: Memory Corruption: The strcpy function overflows the buffer, overwriting adjacent memory regions, potentially including the return address or other critical data structures.
Step 6: Code Execution (Exploit Dependent): Depending on the payload, the attacker may achieve arbitrary code execution. This could involve redirecting the program's control flow to execute malicious code injected into the overflowed buffer or leveraging other memory corruption techniques. The exploit could lead to a reverse shell, data exfiltration, or complete system compromise.
The vulnerability stems from a buffer overflow in the strcpy function within the /goform/formFtpServerDirConfig file of UTT 进取 512W routers. The strcpy function is used to copy the contents of the filename argument, supplied via a remote HTTP request, into a fixed-size buffer without proper bounds checking. By providing a filename argument that exceeds the buffer's capacity, an attacker can overwrite adjacent memory regions, including potentially the return address, allowing for the execution of arbitrary code. The lack of input validation and the use of strcpy instead of a safer alternative like strncpy are the root causes of this vulnerability.
Due to the public availability of the exploit and the lack of vendor response, this vulnerability is likely to be exploited by various threat actors, including opportunistic attackers and potentially more sophisticated groups. There is no information to suggest specific APTs or malware families are currently targeting this vulnerability, but this is subject to change. CISA KEV status: Unknown
Network Intrusion Detection Systems (NIDS) can be configured to detect malicious HTTP POST requests to /goform/formFtpServerDirConfig with excessively long filename parameters.
Web Application Firewalls (WAFs) can be deployed to filter and block malicious requests based on signature-based or behavior-based analysis.
Analyze web server logs for suspicious activity, such as unusually large HTTP POST requests or repeated attempts to access the vulnerable endpoint.
Monitor network traffic for unusual outbound connections from the router, which could indicate a successful compromise.
Examine router file system for suspicious files or modifications.
Implement input validation on the filename parameter to limit its length and prevent buffer overflows. This can be done by using strncpy or other safer string handling functions.
Apply the latest firmware updates from the vendor if available. (However, given the vendor's lack of response, this is unlikely).
If no vendor patch is available, consider replacing the affected router with a more secure alternative.
Restrict access to the router's web interface to only trusted networks or hosts.
Implement a robust intrusion detection and prevention system (IDPS) to monitor network traffic for malicious activity.
Regularly audit the router's configuration and security settings.