[Bug 3295] New: Session Id mismatch

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Fri Apr 9 11:50:45 AEST 2021


            Bug ID: 3295
           Summary: Session Id mismatch
           Product: Portable OpenSSH
           Version: 8.5p1
          Hardware: Other
                OS: Windows 10
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: balu.gajjala at gmail.com

I'm from the win32 OpenSSH team. After merge V8.5, I'm occasionally
getting session-id mismatch. If I retry then it goes away.

Looking at the sshd logs, the ssh->kex->session_id and session_id2 are
matching but memcmp fails. one interesting observation is 
session_id2_len is always 32 no matter how big the session id is.

6220 2021-04-08 18:38:30.216 debug1:
session_id2_len:32 ssh->kex->session_id_len:27
6220 2021-04-08 18:38:30.216 fatal: monitor_apply_keystate: session ID
6220 2021-04-08 18:38:30.216 debug1: do_cleanup
5312 2021-04-08 18:01:51.939 debug1: ssh->kex->session_id:\0234\206
session_id2:\0234\206 session_id2_len:32 ssh->kex->session_id_len:3
5312 2021-04-08 18:01:51.939 fatal: monitor_apply_keystate: session ID
5312 2021-04-08 18:01:51.939 debug1: do_cleanup
4484 2021-04-08 17:57:25.640 debug1: ssh->kex->session_id: session_id2:
session_id2_len:32 ssh->kex->session_id_len:0
4484 2021-04-08 17:57:25.640 fatal: monitor_apply_keystate: session ID
4484 2021-04-08 17:57:25.640 debug1: do_cleanup

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