CVE-2019-5280 in CloudLink Phone 7900
Summary
by MITRE
The SIP TLS module of Huawei CloudLink Phone 7900 with V600R019C10 has a TLS certificate verification vulnerability. Due to insufficient verification of specific parameters of the TLS server certificate, attackers can perform man-in-the-middle attacks, leading to the affected phones registered abnormally, affecting the availability of IP phones.
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Analysis
by VulDB Data Team • 11/25/2023
The vulnerability identified as CVE-2019-5280 resides within the SIP TLS module of Huawei CloudLink Phone 7900 running firmware version V600R019C10. This represents a critical security flaw that undermines the integrity of secure communications established through the Session Initiation Protocol. The affected device operates within enterprise communication environments where voice over IP services rely heavily on proper TLS certificate validation to maintain secure connections between endpoints and servers.
The technical flaw manifests as insufficient verification of specific parameters within the TLS server certificate during the handshake process. This weakness allows attackers to exploit the certificate validation mechanism by presenting forged certificates that pass the device's validation checks. The vulnerability specifically targets the certificate verification logic that should ensure proper authentication of the server identity, but fails to adequately validate crucial certificate attributes such as subject alternative names, certificate authorities, or cryptographic strength indicators. This incomplete validation creates a pathway for malicious actors to intercept and manipulate SIP signaling traffic without detection.
The operational impact of this vulnerability extends beyond simple network disruption to encompass potential complete compromise of the communication infrastructure. When attackers successfully execute man-in-the-middle attacks through this vulnerability, they can manipulate registration processes, intercept voice communications, and potentially gain unauthorized access to the underlying network services. The abnormal registration behavior described in the vulnerability assessment indicates that the device may fail to properly authenticate legitimate servers while accepting malicious certificates, leading to service availability issues that could affect business continuity. This vulnerability directly impacts the availability and integrity of IP phone services, potentially allowing attackers to disrupt critical communication channels within enterprise environments.
Organizations affected by this vulnerability should implement immediate mitigations including firmware updates from Huawei to address the certificate validation weaknesses. Network segmentation and monitoring should be enhanced to detect anomalous registration patterns that may indicate successful exploitation attempts. The vulnerability aligns with CWE-295, which addresses "Improper Certificate Validation," and represents a clear violation of the TLS protocol's fundamental security requirements. From an ATT&CK framework perspective, this vulnerability maps to T1566.001 (Phishing via Service Provider) and T1046 (Network Service Scanning) as attackers may use this weakness to establish persistent access points within the network. Additionally, the vulnerability demonstrates characteristics consistent with T1590.002 (Acquire Infrastructure) and T1071.004 (Application Layer Protocol: DNS) as attackers could potentially leverage the compromised phone to establish command and control communications or exfiltrate data through the affected SIP infrastructure.