Cisco Bug: CSCuq60566 - Incorrect content-length when maddr present with URI in SIP message body
Sep 24, 2020
- Cisco ASA 5500-X Series Firewalls
Known Affected Releases
8.4(7) 9.0(4.7) 9.1(5.1)
Symptom: A SIP receiver endpoint intermittently fails to parse a SIP message (e.g. INVITE) because of extra characters in the beginning of message, causing call failures OR A SIP receiver endpoint receives Malformed SIP message. Conditions: - SIP inspection is enabled on ASA. - A SIP message sent by the sender contains a SIP payload. For example, XML dialog-info in NOTIFY packet. This message doesn't have to be the same message that was rejected by receiver. Any message sent previously in same connection can trigger the problem. - That SIP payload (the XML portion, and not the message itself), contains a SIP URI followed by maddr parameter. For example, sip:12345@X.X.X.X:5060;maddr=X.X.X.X. - The ASA is to rewrite the SIP URI (host and maddr both) using a translation rule on it.
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