On Thu, 19 Sep 2002 16:32:43 -0400, you wrote: >1. Access to the Cisco 7960 IP phone: > > A Cisco model 7960 IP phone running a SIP-compatible image has a > password that can be set by the IP phone administrator. The default > password is "cisco" if the password has not been set to some other > value. Cisco strongly recommends setting the password to something > other than the default. There have been discussion going on (and off) about the danger of default passwords. How long does it take before so-called secure aware companies become really aware of security issues? > The key sequence of "**#" is not intended as a password. It is > clearly and publicly documented in many places within Cisco's > product literature. The key sequence is solely intended to protect > against casual or accidental changes to the phone's configuration. Then just don't accept is as a password. It's that simple, isn't it? >2. Abuse of the TFTP service: > > Although the author is correct that various attacks against the TFTP > service can be mounted, there are several measures that can be > employed by the IP phone administrator and the organization to > mitigate the risk. > > If the network is firewalled properly so that the different network > segments are compartmentalized as the Cisco SAFE white papers > recommend, then the TFTP server will only respond to legitimate > requests. The TFTP server does not need to reside on the same > network segment as the IP phone. If RFC 1918 addressing is employed > for the IP phones and proper ingress/egress filtering is in place as > recommended, then any such attack is highly unlikely to succeed from > outside the enterprise VoIP network, even with the use of UDP. > Access to the physical networks from within the enterprise may make > it easier to succeed with the attack, but if the VLANs are properly > protected and MAC addresses monitored per the SAFE documents -- for > example, by using arpwatch or arpsnmp -- then an attack may be > detected by the IP phone administrators. Not in all situations the IP phones are within one network. Sometimes the phones are used by home workers. And not all ADSL- and cable-companies allow IPsec over their network. At least not when you have a consumer version of the connection. If you want IPsec you have to buy the expensive business version for all the home workers.
This archive was generated by hypermail 2b30 : Fri Sep 20 2002 - 11:59:56 PDT