github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks. The fragment reader left its chunk slice empty and then unconditionally selected the first element. A network peer can supply such a malformed call fragment, including as a direct initial call request after completing the standard initialization handshake.
On that inbound path, the resulting unrecovered Go slice-bounds panic occurs on a library-created dispatch goroutine and terminates the hosting process. This allows remote denial of service against applications that expose the listener to untrusted peers. The impact is limited to availability; no confidentiality or integrity impact was identified.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80c…
security@temporal.io
https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d…
security@temporal.io
https://github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f40825…
security@temporal.io
https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145…
security@temporal.io
https://github.com/temporalio/tchannel-go/pull/14
security@temporal.io
https://github.com/temporalio/tchannel-go/tree/v1.22.1
security@temporal.io