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DescriptionStanislav Grozev
2017-05-11 06:19:31 UTC
Description of problem:
Per the upstream OpenSSH documentation, unknown certificate extensions should just print a warning and continue. The version in RHEL7 erroneously treats them the same as critical extensions - any unknown one is treated as fatal. This is an OpenSSH bug, that was fixed in https://anongit.mindrot.org/openssh.git/commit/?id=ca42c1758575e592239de1d5755140e054b91a0d
Version-Release number of selected component (if applicable):
Any RHEL6 version, even in the latest (openssh-5.3p1-122.el6)
How reproducible:
Steps to Reproduce:
1. Sign an SSH certificate containing a custom extension.
2. Try to log in with it.
3. See the sshd logs.
Actual results:
Login fails, due to a fatal error due to an unknown certificate extension.
Expected results:
Login succeeds, a warning about an unknown certificate extension is logged.
Additional info:
Same is present in RHEL7 (it was a bug introduced in the original OpenSSH code, that they have since fixed, see above). I have opened https://bugzilla.redhat.com/show_bug.cgi?id=1449897 against RHEL7 as well.
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