CVE-2007-6093 in SIParator
Summary
by MITRE
The SRTP implementation in Ingate Firewall before 4.6.0 and SIParator before 4.6.0 allows remote attackers to cause a denial of service (kernel crash) via an RTCP index that is "much more than expected."
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Analysis
by VulDB Data Team • 09/11/2018
The vulnerability identified as CVE-2007-6093 represents a critical denial of service flaw within the Secure Real-time Transport Protocol implementation of Ingate Firewall versions prior to 4.6.0 and SIParator versions prior to 4.6.0. This issue stems from inadequate input validation mechanisms within the RTCP (Real-time Transport Control Protocol) processing component that operates alongside SRTP (Secure Real-time Transport Protocol) for securing multimedia communications. The flaw manifests when the system receives an RTCP packet containing an index value that significantly exceeds anticipated parameters, triggering an unexpected kernel crash that results in complete service disruption.
The technical root cause of this vulnerability lies in the absence of proper bounds checking and validation within the RTCP packet parsing logic. When an attacker crafts a malicious RTCP packet with an inflated index value, the system's kernel fails to properly handle this anomalous input, leading to memory corruption or invalid memory access conditions that ultimately result in kernel panic and system crash. This type of vulnerability aligns with CWE-129, which describes improper validation of input ranges, and represents a classic example of an unchecked buffer access scenario. The vulnerability operates at the kernel level, making it particularly dangerous as it can bring down the entire system rather than just individual services.
From an operational perspective, this vulnerability presents a significant risk to organizations relying on these security appliances for voice and video communication protection. The remote attack vector means that adversaries can exploit this flaw without requiring local access or authentication credentials, making it particularly attractive for attackers seeking to disrupt communication services. The impact extends beyond simple service interruption as a successful exploitation can result in complete system downtime, potentially affecting mission-critical communications infrastructure. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1499, specifically targeting network infrastructure to cause denial of service conditions.
Organizations affected by this vulnerability should immediately implement mitigation strategies including applying the vendor-supplied patches for Ingate Firewall version 4.6.0 and SIParator version 4.6.0, which contain the necessary input validation fixes. Network administrators should also consider implementing additional monitoring and intrusion detection systems to detect anomalous RTCP traffic patterns that may indicate exploitation attempts. The fix typically involves implementing proper input validation routines that check RTCP index values against expected ranges and implementing graceful error handling mechanisms that prevent kernel-level crashes when malformed data is encountered. Additionally, network segmentation and access control measures can help limit the potential impact of such attacks by restricting access to these vulnerable systems.