Vulnerability CVE-2007-2243
Published: 2007-04-25   Modified: 2012-02-12

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.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
OpenSSH - System Account Enumeration if S/Key is used
Rembrandt
27.04.2007

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Openbsd -> Openssh 

 References:
http://xforce.iss.net/xforce/xfdb/33794
http://www.securityfocus.com/bid/23601
http://www.osvdb.org/34600
http://securityreason.com/securityalert/2631
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html
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