By Angelos D. Keromytis
Voice over IP (VoIP) and web Multimedia Subsystem applied sciences (IMS) are swiftly being followed via shoppers, organisations, governments and militaries. those applied sciences supply better flexibility and extra gains than conventional telephony (PSTN) infrastructures, in addition to the opportunity of lower price via apparatus consolidation and, for the shopper industry, new company types. notwithstanding, VoIP platforms additionally symbolize a better complexity by way of structure, protocols and implementation, with a corresponding raise within the strength for misuse.
In this e-book, the authors study the present situation on VoIP defense via a survey of 221 known/disclosed defense vulnerabilities in bug-tracking databases. We supplement this with a entire survey of the cutting-edge in VoIP defense learn that covers 245 papers. Juxtaposing our findings, we determine present parts of probability and deficiencies in examine concentration. This publication may still function a place to begin for figuring out the threats and dangers in a quickly evolving set of applied sciences which are seeing expanding deployment and use. an extra target is to achieve a greater figuring out of the safety panorama with admire to VoIP towards directing destiny study during this and different comparable rising applied sciences.
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Extra resources for Voice over IP Security: A Comprehensive Survey of Vulnerabilities and Academic Research (SpringerBriefs in Computer Science)
For example, improper handling of registration requests may allow attackers to receive messages intended for other users (CVE-2007-6095) (2,C1 , I2 ). Other such examples include failure to authenticate server certificates in wireless environments, enabling man-in-the-middle and eavesdropping attacks (CVE-2008-1114) (2,C1 , I2 ). Predictability and lack of proper use (or sources) of randomness is another vulnerability seen in VoIP products. For example, predictable values in SIP header messages (CVE-2002-1935) allows malicious users to avoid registering but continue using the service (4, I1 , I2 ).
The first uses reputation, with users indicating how much “trust” they have in the persons in their contact lists. These lists (and the trust values) are posted in a directory, where others can access them upon receiving a call from a previously unknown (to them) entity. This scheme requires that every user’s contact information be published, and that attackers cannot mask or change their identities. The second scheme is built around the notion of “payment at risk”, wherein a caller may be required to deposit a small amount to a SIP server prior to placing a call, depending on the callee’s or the SIP proxy’s policy.
They develop a signaling protocol for P2P SIP that uses two different Kademlia-based overlay networks for storing information and forwarding traffic, respectively. Their scheme requires a centralized authentication server, which provides verifiable identities at the application/SIP layer. They consider attacks against their scheme, shared with more general anonymity systems (such as Tor). They use analytical models to estimate communication reliability, cryptographic overhead, and end-to-end signaling latency.