CVE-2025-6732 in HiPER 840G
Summary
by MITRE • 06/27/2025
A vulnerability was found in UTT HiPER 840G up to 3.1.1-190328. It has been classified as critical. This affects the function strcpy of the file /goform/setSysAdm of the component API. The manipulation of the argument passwd1 leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 06/30/2025
The vulnerability identified as CVE-2025-6732 represents a critical buffer overflow flaw in UTT HiPER 840G firmware versions up to 3.1.1-190328. This issue resides within the application programming interface component of the device, specifically in the /goform/setSysAdm file where the strcpy function is improperly utilized. The flaw occurs when processing the passwd1 argument, creating a scenario where malicious input can exceed the allocated buffer space and overwrite adjacent memory regions. The vulnerability's classification as critical stems from its remote exploitability and the fact that public exploitation methods have been disclosed, making it immediately actionable by threat actors without requiring specialized knowledge or tools.
The technical implementation of this vulnerability follows the classic buffer overflow pattern where the strcpy function lacks proper bounds checking mechanisms. When an attacker sends a specially crafted request containing an excessively long password string to the API endpoint, the function copies data beyond the intended buffer boundaries, potentially overwriting stack canaries, return addresses, or other critical program memory segments. This type of flaw directly maps to CWE-121, which describes the condition where a program writes data to a buffer that is insufficiently sized to contain the data being written. The attack vector is particularly concerning as it operates over network protocols without requiring authentication, making it accessible to any remote attacker who can reach the device's API interface.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as buffer overflows of this nature typically enable more sophisticated exploitation techniques including arbitrary code execution and privilege escalation. Attackers could potentially leverage this vulnerability to gain unauthorized administrative access to the device, allowing them to modify system configurations, extract sensitive data, or establish persistent backdoors. The fact that the vendor failed to respond to early disclosure attempts creates a particularly dangerous scenario where the device remains vulnerable for an extended period without official patches or mitigation guidance. This delay in vendor response aligns with ATT&CK technique T1210, which involves exploitation of remote services to gain access to systems, and T1068, which describes the exploitation of vulnerabilities in software to gain elevated privileges.
Organizations should immediately implement network segmentation to isolate affected devices from critical network segments and restrict access to the API endpoints through firewalls and access control lists. The most effective immediate mitigation involves disabling the vulnerable API functionality or implementing input validation measures that prevent overly long password strings from being processed. Long-term solutions require firmware updates from the vendor, though the lack of response suggests organizations may need to consider alternative device replacement strategies or third-party security patches. The vulnerability also highlights the importance of proper input validation practices in embedded systems development, where functions like strcpy should be replaced with safer alternatives such as strlcpy or memcpy with appropriate bounds checking to prevent similar issues in future implementations.