CVE-2007-3177 in Ingate Siparator
Summary
by MITRE
Ingate Firewall and SIParator before 4.5.2 allow remote attackers to bypass SIP authentication via a certain maddr parameter.
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Analysis
by VulDB Data Team • 10/24/2017
The vulnerability identified as CVE-2007-3177 affects Ingate Firewall and SIParator devices running versions prior to 4.5.2, representing a critical security flaw in Session Initiation Protocol authentication mechanisms. This issue stems from improper handling of the maddr parameter within SIP messages, which allows remote attackers to circumvent the authentication process that should normally validate SIP requests. The maddr parameter in SIP protocol specifies the address where a response should be sent, and when improperly validated, it can be manipulated by attackers to bypass authentication checks. This vulnerability specifically targets the SIP authentication framework that protects VoIP communications, potentially allowing unauthorized parties to gain access to voice services and communication infrastructure.
The technical implementation of this flaw involves the device's failure to properly validate the maddr parameter during SIP authentication procedures. When a SIP request is received, the system should verify that the maddr value corresponds to legitimate endpoints and that the requesting entity has proper authorization. However, the vulnerable versions of Ingate Firewall and SIParator fail to perform adequate validation of this parameter, allowing attackers to craft malicious SIP messages with manipulated maddr values that appear legitimate to the authentication system. This represents a classic case of insufficient input validation and authentication bypass, falling under CWE-287 which addresses improper authentication mechanisms. The flaw demonstrates weaknesses in the device's security architecture where network-level authentication controls are bypassed through protocol manipulation rather than direct credential compromise.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it compromises the fundamental security of VoIP communications within affected networks. Attackers exploiting this vulnerability can potentially intercept, modify, or redirect SIP communications, leading to eavesdropping on voice conversations, unauthorized calling privileges, and potential disruption of business communications. The remote nature of the attack means that threat actors can exploit this weakness from outside the network perimeter, making it particularly dangerous for organizations that rely on SIP-based voice services. This vulnerability also aligns with ATT&CK technique T1190 which covers exploitation of remote services, and T1566 which covers credential harvesting through social engineering or exploitation of authentication mechanisms. Organizations may face regulatory compliance issues and potential financial losses due to unauthorized access to their communication infrastructure.
Mitigation strategies for CVE-2007-3177 primarily involve upgrading affected Ingate Firewall and SIParator devices to version 4.5.2 or later, which includes proper validation of the maddr parameter in SIP authentication processes. Network administrators should also implement additional security controls such as SIP authentication enforcement, network segmentation to isolate VoIP traffic, and monitoring of SIP traffic for anomalous maddr parameter usage. The vulnerability highlights the importance of maintaining current firmware versions and implementing robust network security practices. Organizations should also consider deploying intrusion detection systems specifically designed to monitor for SIP protocol anomalies and implementing strong access controls for SIP endpoints. This vulnerability serves as a reminder of the critical importance of validating all input parameters in network protocols and maintaining comprehensive security testing procedures for communication infrastructure components.