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GHSA-pg59-5vwg-4jxq
github.com/emiago/sipgoSummary
The stream parser allocates the SIP body buffer from the Content-Length header before validating its size, which can lead to an unauthenticated DoS.
Details
ParserStream.parseSingle allocates the body buffer from the declared Content-Length with no size check (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L195):
body := make([]byte, contentLength) // contentLength is client-controlled, up to 2^32-1 (uint32)
The ParseMaxMessageLength (65535) check is in the caller ParseNext (https://github.com/emiago/sipgo/blob/v1.4.0/sip/parser_stream.go#L132), and only runs after parseSingle has already allocated the buffer.
PoC
Tested on emiago/sipgo v1.4.0 (latest).
Send a single message with a large Content-Length and no body to a SIP server:
INVITE sip:victim@example.com SIP/2.0
Via: SIP/2.0/TCP attacker.example;branch=z9hG4bK1
From: <sip:attacker@attacker.example>;tag=1
To: <sip:victim@example.com>
Call-ID: 1@attacker.example
CSeq: 1 INVITE
Content-Length: 4000000000 // <- a large Content-Length
Suggested Fix
Validate contentLength against ParseMaxMessageLength before the allocation.
Impact
Unauthenticated DoS. Any service using sipgo with a stream transport (TCP/TLS/WS/WSS) can be forced to run out of memory.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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