{"id":228044,"date":"2012-05-02T09:51:18","date_gmt":"2012-05-02T08:51:18","guid":{"rendered":"https:\/\/securite.intrinsec.com:443\/?p=420"},"modified":"2012-05-02T09:51:18","modified_gmt":"2012-05-02T08:51:18","slug":"voip-hopper-alcatel","status":"publish","type":"post","link":"https:\/\/www.intrinsec.com\/en\/voip-hopper-alcatel\/","title":{"rendered":"Hopper &amp; Alcatel VoIP"},"content":{"rendered":"<p>A new version of VoIP Hopper has just been released (<a title=\"VoIP Hopper News\" href=\"http:\/\/voiphopper.sourceforge.net\/\" target=\"_blank\">Version 2.04 published on 26\/04\/2012<\/a>) and notably provides support for Alcatel infrastructures.<\/p>\n<p>As a reminder, VoIP Hopper is an evaluation tool that tests the capabilities of a PC to<br \/>\nIt mimics the behavior of an IP phone on a VoIP infrastructure. In particular, it allows the detection of the VLAN associated with telephone traffic and then the integration into it.<\/p>\n<p>In the case of an Alcatel infrastructure, VLAN assignment can be performed in various ways, including:<\/p>\n<ul>\n<li>The AVA (Automatic VLAN Assignment) protocol, which is a specific Alcatel protocol, uses option 43 of DHCP requests to provide the VLAN to IP phones.<\/li>\n<li>The LLDP (Link Layer Discovery Protocol) protocol which enables the discovery and exchange of network topology information between devices, including VLAN information.<\/li>\n<li>Manually assigning the VLAN on the phone or switch.<\/li>\n<\/ul>\n<p>For each of the three methods identified above, a test mode has been implemented in VoIP Hopper. This implementation was done in collaboration with Jason Ostrom, the creator of VoIP Hopper, whom I thank especially for his help and the time he spent integrating these features into his excellent tool.<\/p>\n<p>Three modes are therefore available in the new version of VoIP Hopper:<\/p>\n<ul>\n<li>The &quot;-t 0&quot; mode will emulate the behavior of an Alcatel IP phone configured to receive its VLAN using AVA and its IP via Alcatel-specific DHCP.<br \/>\nThe following DHCP options are modified in the &quot;DHCP Discovery&quot; and &quot;DHCP Request&quot; queries to be compatible with Alcatel:<br \/>\n\u2013 Option 43 = 03 <strong>2B<\/strong> FF FF FF<br \/>\n\u2013 Option 12: Host Name = ALCATEL-iptouch-AABBCCDDEEFF<br \/>\n\u2013 Option 60: Vendor Class Identifier: \u00abalcatel.noe.0\u00bb<br \/>\n\u2013 Option 61: Client identifier = 01AABBCCDDEEFF<br \/>\nwhere AABBCCDDEEFF is an Alcatel phone MAC address.<\/li>\n<\/ul>\n<p><strong>Note :<\/strong> This mode was created based in particular on the work of <a title=\"Playing With AVA\" href=\"http:\/\/www.cedric-baillet.fr\/spip.php?article6\" target=\"_blank\">C\u00e9dric Baillet<\/a><\/p>\n<ul>\n<li>The &quot;-t 1&quot; mode will emulate or listen (sniff) LLDP requests in order to retrieve the VoIP VLAN and then position itself within it (hop) and perform Alcatel-compatible DHCP requests.<br \/>\nThe modified DHCP options are the same as for the &quot;-t 0&quot; mode, except for option 43, which is equal to 03. <strong>02<\/strong> FF FF FF<\/li>\n<\/ul>\n<div><\/div>\n<ul>\n<li>The &quot;-t 2&quot; mode allows you to manually specify a VLAN in which VoIP Hopper will position itself to perform Alcatel-compatible DHCP requests.<\/li>\n<\/ul>\n<p>Various MAC address-based protections can be in place on the switch:<\/p>\n<ul>\n<li>Limitation to Alcatel MAC addresses (<strong>00:80:9F:<\/strong>XX:XX:XX) of the discovery of the VoIP VLAN by LLDP<\/li>\n<li>Restricting the MAC addresses allowed on the port<\/li>\n<li>\u2026<\/li>\n<\/ul>\n<p>A &quot;-m&quot; option is therefore available for all modes allowing spoofing a<br \/>\nThe Alcatel MAC address was retrieved from the IP phone and these protections were bypassed.<\/p>\n<p>Ultimately, the commands below allow you to adapt to different Alcatel configurations:<\/p>\n<ul>\n<li>voiphopper -i eth0 -t 0<\/li>\n<li>voiphopper -i eth0 -t 0 -m AA:BB:CC:DD:EE:FF<\/li>\n<li>voiphopper -i eth0 -t 1<\/li>\n<li>voiphopper -i eth0 -t 1 -m AA:BB:CC:DD:EE:FF<\/li>\n<li>voiphopper -i eth0 -t 2 -v 800<\/li>\n<li>voiphopper -i eth0 -t 2 -v 800 -m AA:BB:CC:DD:EE:FF<\/li>\n<\/ul>\n<p>Since the Hopper VoIP tool is not limited to Alcatel-Lucent infrastructures, I invite you to take a look at <a title=\"Hopper VoIP Features \" href=\"http:\/\/voiphopper.sourceforge.net\/features.html\" target=\"_blank\">its many other integration capabilities<\/a>.<\/p>\n<p>Good placement! \u2026 whether she owns it or not \ud83d\ude00<\/p>","protected":false},"excerpt":{"rendered":"<p>Une nouvelle version de VoIP Hopper vient de sortir (V2.04 publi\u00e9e le 26\/04\/2012) et apporte [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":446,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,22],"tags":[85,86,87,68,88,89,90,91],"class_list":["post-228044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evaluation-securite","category-veille-securite","tag-alcatel","tag-ava","tag-lldp","tag-outils","tag-pentest","tag-toip","tag-vlan","tag-voip"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>VoIP Hopper &#038; 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