CVE-2025-25504 in WebFWC
Summary
by MITRE • 05/05/2025
An issue in the /usr/local/bin/jncs.sh script of Gefen WebFWC (In AV over IP products) v1.85h, v1.86v, and v1.70 allows attackers with network access to connect to the device over TCP port 4444 without authentication and execute arbitrary commands with root privileges.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability identified as CVE-2025-25504 represents a critical authentication bypass flaw within the Gefen WebFWC security appliance family, specifically affecting versions 1.85h, 1.86v, and 1.70 of the In AV over IP products. This vulnerability resides in the /usr/local/bin/jncs.sh script which serves as a network control interface for the device, exposing a significant security weakness that allows unauthenticated remote attackers to establish connections on TCP port 4444 and execute arbitrary commands with root privileges. The flaw fundamentally undermines the device's security architecture by providing direct access to the underlying operating system without proper authentication mechanisms.
The technical implementation of this vulnerability stems from improper access control measures within the jncs.sh script, which fails to validate user credentials before granting access to privileged command execution capabilities. When an attacker connects to TCP port 4444, the script does not enforce authentication checks, enabling immediate execution of system commands with the highest possible privileges. This represents a direct violation of the principle of least privilege and demonstrates a critical failure in the device's security model. The vulnerability aligns with CWE-284, which addresses improper access control issues, and specifically manifests as an authentication bypass vulnerability that allows privilege escalation from unauthenticated access to root-level system control.
The operational impact of this vulnerability is severe and far-reaching, as it provides attackers with complete system compromise capabilities. Once exploited, the attacker gains root access to the device, enabling them to modify system configurations, install malicious software, exfiltrate sensitive data, or use the compromised device as a pivot point for further attacks within the network. The vulnerability affects network infrastructure devices that are typically considered security-critical components, making this a particularly dangerous flaw in environments where these devices are deployed. The exposure through TCP port 4444 also means that the vulnerability is easily discoverable by network scanning tools, increasing the likelihood of exploitation.
Mitigation strategies for this vulnerability should prioritize immediate network segmentation and access control measures to prevent unauthorized access to TCP port 4444. Organizations should implement firewall rules to block external access to this port and restrict internal access to only authorized personnel. The most effective long-term solution involves applying vendor-provided patches or firmware updates that address the authentication bypass flaw in the jncs.sh script. Security teams should also conduct comprehensive network monitoring to detect any suspicious connections to port 4444 and implement intrusion detection systems to alert on potential exploitation attempts. Additionally, this vulnerability demonstrates the importance of regular security assessments and vulnerability management programs, as outlined in the NIST Cybersecurity Framework, to identify and remediate similar authentication bypass issues in network infrastructure devices. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the execution of malicious code with elevated privileges, making it a critical concern for organizations implementing cybersecurity defenses.