National Cyber-Alert System
Vulnerability Summary for CVE-2007-2243
Original release date:04/25/2007
Last revised:09/05/2008
Source:
US-CERT/NIST
Overview
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.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
Exploitability Subscore:
8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type:Allows unauthorized disclosure of information
- Official Statement from Red Hat (05/23/2007)
-
Not vulnerable. OpenSSH supplied with Red Hat Enterprise Linux 2.1, 3, 4, and 5 does not contain S/KEY support.
References to Advisories, Solutions, and Tools
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External Source: XF
Name: openssh-challenge-information-disclosure(33794)
External Source: BID
Name: 23601
External Source: FULLDISC
Name: 20070424 OpenSSH - System Account Enumeration if S/Key is used
External Source: FULLDISC
Name: 20070421 OpenSSH - System Account Enumeration if S/Key is used
External Source: OSVDB
Name: 34600
External Source: SREASON
Name: 2631
