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OpenSSH S/KEY Challenge Response Authentication User Enumeration Leak

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OpenSSH S/KEY Challenge Response Authentication User Enumeration Leak

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
04/25/2007
Created
07/25/2018
Added
08/07/2007
Modified
05/27/2016

Description

OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.

Solution(s)

  • ssh-openssh-challenge-response-username-reveal-workaround

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