Public bug reported:
Brute force attacks against openssh on Trusty will not log "max auth"
key-based attempts, leaving their brute forcing invisible to the logs
and anything that consumes logs, like fail2ban. Version 6.7 introduced
the logging, but it's missing in Trusty. Since Trusty is LTS, it would
seem sensible to have this feature backported.
[Impact] Bruce force attempts using private keys are invisible to logs,
which renders defenses like fail2ban useless.
[Test case] Create 20 SSH keys, try to log in over SSH, note lack of
logging the failures.
[Regression Potential] Very unlikely regression potential as the "max
auth" condition is already handled in code, it just wasn't logging. The
change only adds the missing logging.
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: openssh (Ubuntu Trusty)
Importance: Undecided
Assignee: Kees Cook (kees)
Status: New
** Also affects: openssh (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: openssh (Ubuntu)
Status: New => Fix Released
** Changed in: openssh (Ubuntu Trusty)
Assignee: (unassigned) => Kees Cook (kees)
** Description changed:
Brute force attacks against openssh on Trusty will not log "max auth"
key-based attempts, leaving their brute forcing invisible to the logs
and anything that consumes logs, like fail2ban. Version 6.7 introduced
the logging, but it's missing in Trusty. Since Trusty is LTS, it would
seem sensible to have this feature backported.
+
+ [Impact] Bruce force attempts using private keys are invisible to logs,
+ which renders defenses like fail2ban useless.
+
+ [Test case] Create 20 SSH keys, try to log in over SSH, note lack of
+ logging the failures.
+
+ [Regression Potential] Very unlikely regression potential as the "max
+ auth" condition is already handled in code, it just wasn't logging. The
+ change only adds the missing logging.
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https://bugs.launchpad.net/bugs/1534340
Title:
openssh server 6.6 does not report max auth failures
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