CVE-2015-8229 in eSpace U2980 Unified Gateway
Summary
by MITRE
Huawei eSpace U2980 unified gateway with software before V100R001C10 and U2990 with software before V200R001C10 allow remote authenticated users to cause a denial of service via crafted signaling packets from a registered device.
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Analysis
by VulDB Data Team • 04/18/2018
The Huawei eSpace U2980 unified gateway and U2990 communication systems contain a critical vulnerability that enables remote authenticated attackers to trigger denial of service conditions through carefully crafted signaling packets. This vulnerability affects specific software versions where the systems fail to properly validate incoming signaling traffic from registered devices, creating a pathway for malicious actors to disrupt normal operational functions. The flaw exists within the protocol handling mechanisms that process communication signaling messages, specifically when these systems receive malformed or unexpected packet structures from authenticated endpoints that have established legitimate connections to the network infrastructure.
The technical implementation of this vulnerability stems from insufficient input validation and error handling within the signaling processing modules of these unified communication devices. When registered devices transmit specially crafted signaling packets, the systems lack proper sanitization routines that would normally detect and reject malformed data structures. This weakness allows attackers to exploit the absence of robust packet validation checks, enabling them to send packets that cause the gateway to crash or become unresponsive. The vulnerability operates at the application layer of the network stack, targeting the signaling protocol implementations that manage voice and data communications within the unified gateway infrastructure. According to CWE classification, this represents a weakness in input validation and error handling that falls under CWE-20, which encompasses improper input validation issues that can lead to various security consequences including denial of service conditions.
The operational impact of this vulnerability extends beyond simple service disruption as it can severely compromise the reliability of enterprise communication systems that depend on these unified gateways. Organizations utilizing affected Huawei equipment may experience complete communication outages, including voice calls, video conferencing, and data transmission services that rely on the affected devices. The remote nature of the attack means that threat actors can exploit this vulnerability from external network locations without requiring physical access to the premises, making it particularly dangerous for enterprise environments. The authentication requirement for exploitation adds a layer of complexity as attackers must first establish legitimate credentials to access the system, though this does not prevent the subsequent denial of service attack. From an attacker tactics perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the service stoppage category, where adversaries target system availability through various methods including protocol manipulation and resource exhaustion attacks.
Organizations should implement immediate mitigations including firmware updates to the latest available versions that address the input validation weaknesses in the signaling processing modules. The affected software versions V100R001C10 for U2980 and V200R001C10 for U2990 represent the baseline for vulnerability remediation, with patching operations requiring careful planning to avoid operational disruption. Network segmentation strategies should be implemented to limit the scope of potential exploitation, particularly by isolating the affected gateways from critical network segments where possible. Monitoring solutions should be enhanced to detect unusual signaling packet patterns that may indicate exploitation attempts, with intrusion detection systems configured to alert on malformed signaling traffic. Additionally, organizations should conduct comprehensive vulnerability assessments to identify any other network devices that may be running the same vulnerable software versions, as the attack surface extends beyond the immediate affected systems. Regular security audits and network traffic analysis should become standard practice to identify potential exploitation patterns before they can cause significant operational impact. The vulnerability demonstrates the importance of maintaining current firmware versions and implementing robust network security practices to protect against protocol-level attacks that can compromise system availability and business continuity operations.