Source: cna@vuldb.com
A vulnerability was detected in UTT 进取 512W 1.7.7-171114. Affected by this issue is the function strcpy of the file /goform/formFtpServerShareDirSelcet. Performing manipulation of the argument oldfilename results in buffer overflow. The attack can be initiated remotely. The exploit is now public 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 1.7.7-171114 allows for remote code execution due to a buffer overflow in the strcpy function. This vulnerability is easily exploitable and poses a significant risk of complete system compromise, as the vendor has not responded to the disclosure.
Step 1: Payload Delivery: The attacker crafts a malicious HTTP request to the vulnerable device, targeting the /goform/formFtpServerShareDirSelcet endpoint.
Step 2: Malicious Input: The attacker includes a specially crafted oldfilename argument in the HTTP request. This argument contains a string that is longer than the buffer allocated for it.
Step 3: strcpy Execution: The vulnerable strcpy function attempts to copy the attacker-controlled oldfilename into the buffer.
Step 4: Buffer Overflow: Due to the lack of bounds checking, strcpy writes past the end of the allocated buffer, overwriting adjacent memory regions.
Step 5: Code Execution: By carefully crafting the oldfilename payload, the attacker can overwrite critical program data, such as function pointers or return addresses, redirecting program execution to attacker-controlled code (e.g., a shellcode payload) or achieving a denial-of-service.
The vulnerability lies within the /goform/formFtpServerShareDirSelcet file, specifically in the use of the strcpy function. The function is used to copy the contents of the oldfilename argument without any bounds checking. This lack of validation allows an attacker to provide an oldfilename argument that exceeds the allocated buffer size, leading to a buffer overflow. This overwrite can overwrite adjacent memory, including critical program data or control flow structures, enabling the attacker to execute arbitrary code. The root cause is a classic buffer overflow due to the unsafe use of strcpy and the absence of input validation on the oldfilename parameter. This allows for arbitrary code execution.
While no specific APTs are directly linked, the ease of exploitation and public availability of the exploit make this a target for a wide range of attackers, including script kiddies and financially motivated actors. The lack of vendor response suggests a high likelihood of this vulnerability remaining unpatched for a significant period. This vulnerability is likely to be quickly incorporated into existing botnets and exploit kits. CISA KEV status: Likely to be added soon.
Network traffic analysis: Look for unusually long strings in HTTP POST requests to /goform/formFtpServerShareDirSelcet.
IDS/IPS signatures: Implement signatures to detect malicious payloads targeting the strcpy vulnerability.
Log analysis: Examine web server logs for suspicious activity, such as unusually large POST requests or unexpected errors related to the vulnerable endpoint.
File integrity monitoring: Monitor the /goform/formFtpServerShareDirSelcet file for unauthorized modifications.
Honeypots: Deploy honeypots to attract and analyze exploit attempts.
Implement input validation: Ensure that the oldfilename argument is validated to prevent buffer overflows. Limit the length of the input string to the size of the destination buffer minus one (for the null terminator).
Replace strcpy: Replace the vulnerable strcpy function with a safer alternative, such as strncpy, which allows for specifying a maximum number of characters to copy.
Apply vendor patches: If a patch is released, apply it immediately. However, given the vendor's lack of response, this is unlikely.
Network segmentation: Isolate the vulnerable device from critical network segments to limit the impact of a successful exploit.
Web Application Firewall (WAF): Deploy a WAF to filter malicious requests targeting the vulnerable endpoint.
Regular security audits: Conduct regular security audits and penetration testing to identify and address vulnerabilities.