NDLI: Counteract DNS Attacks on SIP Proxies Using Bloom Filters

Content Provider	IEEE Xplore Digital Library
Author	Ge Zhang Fischer-Hubner, S.
Copyright Year	2013
Description	Author affiliation: Karlstad Univ., Karlstad, Sweden (Ge Zhang; Fischer-Hubner, S.)
Abstract	SIP proxies play an important part in VoIP services. A Denial of Service (DoS) attack on them may cause the failure of the whole network. We investigate such a DoS attack by exploiting DNS queries. A SIP proxy needs to resolve domain names for processing a message. However, a DNS resolution may take a while. To avoid being blocked, a proxy suspends the processing task of the current message during its name resolution, so that it can continue to deal with other messages. Later when the answer is received, the suspended task will be resumed. It is an asynchronous implementation of DNS queries. Unfortunately, this implementation consumes memory storage and also brings troubles like a race condition. An attacker can collect a list of domain names which take seconds to resolve. Then, the attacker sends to a victim SIP proxy messages which contain these domain names. As a result, the victim proxy has to suspend a number of messages in a short while. Our experiments show that a SIP proxy can be easily crashed by such an attack and thus be not available anymore. To solve the problem, we analyzed the reasons that make a DNS query time-consuming, and then proposed a prevention scheme using bloom filters to blacklist suspicious DNS authoritative servers. Results of our experiments show it efficiently mitigates the attack with a reasonable false positive rate.
Starting Page	678
Ending Page	684
File Size	261505
Page Count	7
File Format	PDF
ISBN	9780769550084
DOI	10.1109/ARES.2013.89
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computers Protocols DNS DoS Computer crashes Internet SIP Servers IP networks Computer crime
Content Type	Text
Resource Type	Article

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