By Iosif I. Androulidakis
This booklet starts with an advent to PBXs (Private department Exchanges) and the scene, facts and concerned actors. It discusses confidentiality, integrity and availability threats in PBXs. the writer examines the threats and the technical historical past in addition to defense and forensics related to PBXs. the aim of this publication is to elevate consumer wisdom with regard to safeguard and privateness threats found in PBXs, aiding either clients and directors defend their platforms. the recent variation incorporates a significant replace and extension to the VoIP sections as well as updates to forensics.
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Extra info for VoIP and PBX Security and Forensics: A Practical Approach
Sample text
At the same time, protocol responses to carefully crafted messages can reveal information about the system or its users to an attacker. VoIP is implemented on top of IP infrastructure, including protocols and services such as DHCP, DNS, RADIUS, TFTP, BOOTP, NAT, STUN, NTP, SNMP, HTTP, TLS/SSL, Routing protocols, and others. Securing the VoIP overall means the administrator has to always keep secure all these supporting protocols. Failing to do so can critically affect VoIP. As an example, lack of proper authentication by the registrar or proxy, or by the SNMP server can lead to traffic interception and user impersonation.
23 Menu driven PBX programming Getting access, a malicious hacker could launch all the attacks described previously against confidentiality, integrity, and availability. At this point we must note that most systems have a comprehensive on-line help. So, even if the intruder is not perfectly familiar with the system he can be assisted. ” at the management prompt. A long list (truncated in Fig. 24) is returned with all the commands. 9 Low Level Tools 43 Fig. 9 Low Level Tools Besides the everyday tools that administrators use, an array of low level, powerful commands, and tools are available, sometimes non-documented and restricted for highly experienced personnel.
Another effective denial of service technique can target the software and hardware protection of PBXs. Modern PBXs employ protection against unauthorized copying and black market selling utilizing some form of hardware key, usually with a field programmable gate array (FPGA) integrated circuit. The FPGA holds a specific hash that is coupled to the hardware present in the PBX. If somebody tampers with this protection mechanism, the PBX will enter a limited functionality mode and eventually will shut down, protecting the vendor’s profits and the PBX from illegal interventions and black market operations.
