CVE-2024-41700: Barix SIP Client Information Disclosure

CVE-2024-41700 Overview

CVE-2024-41700 is an information disclosure vulnerability affecting Barix SIP Client Firmware. The flaw is classified under [CWE-200], Exposure of Sensitive Information to an Unauthorized Actor. Remote attackers can retrieve sensitive data from affected devices without authentication or user interaction. The vulnerability is exploitable over the network and impacts the confidentiality of the affected system.

Critical Impact

Unauthenticated remote attackers can access sensitive information stored on or transmitted by Barix SIP Client devices, potentially exposing configuration data, credentials, or call metadata used in VoIP communications.

Affected Products

• Barix SIP Client Firmware (all versions covered by the advisory)
• Barix VoIP/audio-over-IP devices running the SIP Client Firmware
• Deployments exposing the SIP Client management interface to untrusted networks

Discovery Timeline

• 2024-08-20 - CVE-2024-41700 published to NVD
• 2024-09-03 - Last updated in NVD database

Technical Details for CVE-2024-41700

Vulnerability Analysis

The vulnerability resides in the Barix SIP Client Firmware and falls under the [CWE-200] category. The firmware exposes sensitive information to actors who are not authorized to view it. Because the attack vector is network-based and requires no privileges or user interaction, any attacker with network reachability to a vulnerable device can request and obtain sensitive data.

Barix SIP Client devices typically operate as VoIP endpoints in paging, intercom, and broadcast systems. Information accessible through this flaw may include device configuration, network details, or session-related data used during SIP signaling. Exposure of such data can support follow-on attacks against the device or the broader VoIP infrastructure.

Root Cause

The root cause is improper restriction of access to sensitive resources within the firmware. The device returns information that should be limited to authenticated administrators when queried by an unauthenticated network client. Missing or insufficient authorization checks on the affected interface allow this exposure.

Attack Vector

An attacker sends crafted network requests to the management or service interface of a Barix SIP Client device. The device responds with sensitive information without enforcing authentication. No code execution or user interaction is required, and the attack can be repeated to harvest data over time.

No verified proof-of-concept code is publicly available. See the Israeli Government CVE Advisories for technical details published by the coordinating authority.

Detection Methods for CVE-2024-41700

Indicators of Compromise

• Unexpected HTTP or SIP requests to Barix device management endpoints originating from external or untrusted networks.
• Outbound transfers of configuration files or device state data from Barix endpoints to non-administrative hosts.
• Repeated unauthenticated probes against TCP/UDP ports used by the SIP Client Firmware.

Detection Strategies

• Inspect network traffic for requests to Barix device interfaces that return verbose configuration or diagnostic data without prior authentication.
• Correlate VoIP signaling logs with management-plane access attempts to identify reconnaissance against SIP endpoints.
• Audit device logs for access patterns from IP addresses outside the approved administrative range.

Monitoring Recommendations

• Forward Barix device logs and surrounding network telemetry to a centralized SIEM or data lake for correlation and retention.
• Monitor for anomalous SIP traffic volumes or scanning behavior targeting voice subnets.
• Alert on any access to Barix administrative URIs from outside designated management VLANs.

How to Mitigate CVE-2024-41700

Immediate Actions Required

• Restrict network access to Barix SIP Client devices using firewall rules and dedicated VoIP VLANs that block untrusted sources.
• Inventory all Barix SIP Client deployments and confirm none are reachable from the public internet.
• Review device configurations and rotate any credentials or secrets that may have been exposed.

Patch Information

Refer to the Israeli Government CVE Advisories and Barix vendor channels for firmware updates addressing CVE-2024-41700. Apply the latest firmware release provided by Barix to remediate the information disclosure issue. Validate the firmware version after upgrade and confirm that the affected interface no longer returns sensitive data to unauthenticated requests.

Workarounds

• Place Barix SIP Client devices behind a VPN or jump host so management interfaces are not exposed to general network segments.
• Apply access control lists at the network layer to permit administrative traffic only from trusted management workstations.
• Disable any unused services on the device to reduce the exposed attack surface.

# Example: restrict access to Barix device management interface with iptables
# Allow only the administrative subnet 10.10.50.0/24 to reach the device
iptables -A FORWARD -s 10.10.50.0/24 -d <barix_device_ip> -j ACCEPT
iptables -A FORWARD -d <barix_device_ip> -j DROP