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Hello live555 maintainers:</div>
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There is an unauthenticated, remotely-triggerable use-after-free in the</div>
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RTSP-over-HTTP tunneling code of RTSPServer.cpp (liveMedia 2026.07.06, affects</div>
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any RTSPServer-based server).</div>
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Root cause: the server maps an "x-sessioncookie" to a raw RTSPClientConnection*</div>
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in fClientConnectionsForHTTPTunneling. handleHTTPCmd_TunnelingGET()</div>
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(RTSPServer.cpp:633) can Add() several cookies for one connection but only</div>
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records the last in fOurSessionCookie, and ~RTSPClientConnection()</div>
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(RTSPServer.cpp:344) removes only that one. A connection that registers two</div>
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different cookies thus leaves a stale table entry after it is freed; a later</div>
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HTTP POST that references it (Lookup at :657, then changeClientInputSocket at</div>
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:669/:1247) dereferences the freed connection.</div>
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Reproduction (single client, "\r\n" = CR LF):</div>
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Connection #1 -- send, then close the socket:</div>
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GET / HTTP/1.0\r\nx-sessioncookie: AAAA\r\n\r\n</div>
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GET / HTTP/1.0\r\nx-sessioncookie: BBBB\r\n\r\n</div>
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-> connection freed; only "BBBB" removed, "AAAA -> freed connection" remains.</div>
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Connection #2 -- new socket:</div>
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POST / HTTP/1.0\r\nx-sessioncookie: AAAA\r\n\r\n</div>
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-> Lookup("AAAA") returns the freed connection -> use-after-free.</div>
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Under AddressSanitizer: heap-use-after-free (READ of size 8) in</div>
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ClientConnection::envir() via handleHTTPCmd_TunnelingPOST -> changeClientInputSocket;</div>
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freed at ~RTSPClientConnection ("delete this", RTSPServer.cpp:1036).</div>
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The PoC (server.cc + client.py) is ready and reproduces the transcript above in</div>
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a single run against the stock library. I'm happy to provide any further detail</div>
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or test a patch. If you would like to assign a CVE for this, I can also supply</div>
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whatever information you need for the request and coordinate on disclosure</div>
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timing.</div>
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Best regards,</div>
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Zhou Qingyang</div>
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