The Asterisk PBX is susceptible to a remote denial of service vulnerability via a specially crafted INVITE message. Affected versions include 1.2.14, 1.2.15, 1.2.16, 1.4.1, and possibly earlier versions.
dcea662ad08cea899e48c0048baa82b147423db4985672cd1bb981e6a9194636This is a multi-part message in MIME format.
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MADYNES Security Advisory
<http://madynes.loria.fr/> http://madynes.loria.fr
Title: Asterisk SIP INVITE remote DOS
Release Date:
08/03/2007
Severity:
High - Denial of Service
Advisory ID:KIPH1
Software:
Asterisk
<http://www.asterisk.org/> http://www.asterisk.org/
AsteriskR is a complete IP PBX in software. It runs on a wide variety of
operating systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun
Solaris and provides all of the features you would expect from a PBX
including many advanced features that are often associated with high end
(and high cost) proprietary PBXs. AsteriskR supports Voice over IP in many
protocols, and can interoperate with almost all standards-based telephony
equipment using relatively inexpensive hardware.
Affected Versions:
Asterisk 1.2.14, 1.2.15, 1.2.16
Asterisk 1.4.1
probably previous versions also
Unaffected Versions: Trunk version to date (13/03/2007)
Vulnerability Synopsis: After sending a crafted INVITE message the software
finish abruptly its execution with a Segmentation Fault provoking a Denial
of Service (DoS) in all the services provided by the entity.
Impact: A remote individual can remotely crash and perform a Denial of
Service(DoS) attack in all the services provided by the software by sending
one crafted SIP INVITE message. This is conceptually similar to the "ping of
death".
Resolution: The problem has been fixed in Asterisk versions 1.4.2 and
1.2.17, which is released today 19/03/2007
Vulnerability Description: After sending a crafted message the software
crash abruptly. The message in this case is an anonymous INVITE where the
SDP contains 2 connection headers. The first one must be valid and the
second not where the IP address should be invalid. The callee needs not to
be a valid user or dialplan. In case where asterisk is set to disallow
anonymous call, a valid user and password should be known, and while
responding the corresponding INVITE challenge the information should be
crafted as above. After this crafted SIP INVITE message, the affected
software crash immediately.
Proof of Concept Code: available
Credits:
Humberto J. Abdelnur (Ph.D Student)
Radu State (Ph.D)
Olivier Festor (Ph.D)
This vulnerability was identified by the Madynes research team at
INRIA
Lorraine, using the Madynes VoIP fuzzer.
<http://madynes.loria.fr/> http://madynes.loria.fr/
Disclosure Distribution:
The advisory will be posted on the following websites:
1) Asterisk's website
2) <http://madynes.loria.fr/> http://madynes.loria.fr website
The advisory will be posted to the following mailing lists:
1) full-disclosure@lists.grok.org.uk
2) voipsec@vopisa.org
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<body lang=3DFR link=3Dblue vlink=3Dpurple>
<div class=3DSection1>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>MADYNES Security
Advisory <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier New"'><a
href=3D"http://madynes.loria.fr/"><span =
lang=3DEN-US>http://madynes.loria.fr</span></a></span></font><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'>Title: =
Asterisk
SIP INVITE remote DOS <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Release Date:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> =
08/03/2007<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Severity: <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> High -
Denial of Service<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Advisory ID:KIPH1<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Software:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> =
Asterisk<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> </span></font><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'><a
href=3D"http://www.asterisk.org/"><span =
lang=3DEN-US>http://www.asterisk.org/</span></a></span></font><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'text-align:justify;text-autospace:none'><font size=3D2
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Asterisk®
is a complete IP PBX in software. It runs on a wide variety of operating
systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun Solaris and
provides all of the features you would expect from a PBX including many
advanced features that are often associated with high end (and high =
cost)
proprietary PBXs. Asterisk® supports Voice over IP in many =
protocols, and can
interoperate with almost all standards-based telephony equipment using
relatively inexpensive hardware.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Affected
Versions:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> Asterisk
1.2.14, 1.2.15, 1.2.16 <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> Asterisk
1.4.1 <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> probably
previous versions also<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Unaffected
Versions: Trunk version to date =
(13/03/2007)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'text-align:justify;text-autospace:none'><font size=3D2
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Vulnerability
Synopsis: After sending a crafted INVITE message the software finish =
abruptly
its execution with a Segmentation Fault provoking a Denial of Service =
(DoS) in
all the services provided by the entity.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'text-align:justify;text-autospace:none'><font size=3D2
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Impact:
A remote individual can remotely crash and perform a Denial of =
Service(DoS) attack
in all the services provided by the software by sending one crafted SIP =
INVITE
message. This is conceptually similar to the "ping of death". =
<o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'text-align:justify;text-autospace:none'><font size=3D2
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Resolution: The problem
has been fixed in Asterisk versions 1.4.2 and 1.2.17, which is released =
today 19/03/2007
<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'text-align:justify;text-autospace:none'><font size=3D2
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Vulnerability
Description: After sending a crafted message the software crash =
abruptly. The
message in this case is an anonymous INVITE where the SDP contains 2 =
connection
headers. The first one must be valid and the second not where the IP =
address
should be invalid. The callee needs not to be a valid user or dialplan. =
In case
where asterisk is set to disallow anonymous call, a valid user and =
password
should be known, and while responding the corresponding INVITE challenge =
the
information should be crafted as above. After this crafted SIP INVITE =
message,
the affected software crash immediately. <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'>Proof =
of Concept
Code: available<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Credits:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> Humberto J.
Abdelnur (Ph.D Student)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> <st1:place
w:st=3D"on"><st1:PlaceName w:st=3D"on">Radu</st1:PlaceName> =
<st1:PlaceType w:st=3D"on">State</st1:PlaceType></st1:place>
(Ph.D)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> Olivier
Festor (Ph.D)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> This
vulnerability was identified by the Madynes research team at =
INRIA<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> <st1:place
w:st=3D"on"><st1:State w:st=3D"on">Lorraine</st1:State></st1:place>, =
using the
Madynes VoIP fuzzer.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> </span></font><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'><a
href=3D"http://madynes.loria.fr/"><span =
lang=3DEN-US>http://madynes.loria.fr/</span></a></span></font><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Disclosure
Distribution: <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> The
advisory will be posted on the following =
websites:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> 1) Asterisk's
website<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> 2) =
</span></font><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'><a
href=3D"http://madynes.loria.fr/"><span =
lang=3DEN-US>http://madynes.loria.fr</span></a></span></font><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'> website<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> The
advisory will be posted to the following mailing =
lists:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> 1) =
full-disclosure@lists.grok.org.uk<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'> 2) =
voipsec@vopisa.org<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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