[Bug 3546] New: Use SHA2 in ssh-keygen key verification

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Sat Mar 4 04:52:27 AEDT 2023


            Bug ID: 3546
           Summary: Use SHA2 in ssh-keygen key verification
           Product: Portable OpenSSH
           Version: 8.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh-keygen
          Assignee: unassigned-bugs at mindrot.org
          Reporter: dbelyavs at redhat.com

Created attachment 3681
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3681&action=edit
Proposed fix

ssh-keygen uses SHA1 algorithm (default) when verifying that the key is
usable. It causes problems on recent systems where SHA1 is disabled for
use with signatures (at least, RHEL 9+).

The proposed patch enforces using a sha2 algorithm for key

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