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National Cyber Awareness System

Vulnerability Summary for CVE-2007-2768

Original release date:05/21/2007
Last revised:09/05/2008
Source: US-CERT/NIST

Overview

OpenSSH, when using OPIE (One-Time Passwords in Everything) for PAM, allows remote attackers to determine the existence of certain user accounts, which displays a different response if the user account exists and is configured to use one-time passwords (OTP), a similar issue to CVE-2007-2243.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score:4.3 (MEDIUM) (AV:N/AC:M/Au:N/C:P/I:N/A:N) (legend)
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

Vendor Statements (disclaimer)

Official Statement from Red Hat (05/23/2007)
Not vulnerable. OPIE for PAM is not shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.

References to Advisories, Solutions, and Tools

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External Source: OSVDB
Name: 34601
Hyperlink:http://www.osvdb.org/34601
External Source: FULLDISC
Name: 20070424 Re: OpenSSH - System Account Enumeration if S/Key is used
Hyperlink:http://archives.neohapsis.com/archives/fulldisclosure/2007-04/0635.html

Vulnerable software and versions

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Technical Details

Vulnerability Type (View All)
CVE Standard Vulnerability Entry:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2768