hakin9 - 2005 - 5 by hakin9 team
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Whatever the truth, security problems should always be carefully considered before migrating to a new technology. As this article has shown, numerous attack vectors have been known for years – most are just slightly modified attacks on the IP protocol. Successful attacks against SIP/RTP are typically possible in LAN structures with unencrypted communications, for example by sniffing RTP streams. This attack is absolutely no different to sniffing data communications in TCP/IP. Most of the other attacks can only be successful if the SIP proxy or the UAC (User Agent Client) don't process the call ID correctly or if the attacker sniffs out the call ID.
The second one was used by the master to control the botnet through Irssi, a text IRC client. In order to make reverse engineering difficult, Agobot implements routines defending against the use of debuggers such as SoftICE or OllyDbg, and against the use of virtual machines such as VMware and Virtual PC. It was therefore necessary to hack the source code in order to bypass VMware protection, before the bot could be installed on our sample virtual systems. Figure 6. Master request response from the first bot Configuration The first step was to configure the bot with the use of its simple graphical interface (see Figure 3).
If the application is executed on a server, with mission-critical processes running alongside, the scenario is completely unacceptable. Also, a malicious programmer could potentially overwrite memory segments containing data belonging to vital (for instance security-related) processes, such as system processes or even the virtual machine itself. This would allow the intruder to substitute the Security Manager or ClassLoader, thus leading to a critical system threat. Security Manager as allowing full system access (see Inset Security Manager).