medium
5
CWE
287
Advisory Published
Updated

CVE-2007-2243

First published: Wed Apr 25 2007(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
OpenSSH=3.8
OpenSSH=3.8.1p1
OpenSSH=4.3p2
OpenSSH=3.2.2
OpenSSH=3.1
OpenSSH=3.0.2p1
OpenSSH=4.1
OpenSSH=3.8.1
OpenSSH=2.1.1
OpenSSH=3.7.1p2
OpenSSH=3.2.3p1
OpenSSH=3.1p1
OpenSSH=2.5.1
OpenSSH=2.9.9p2
OpenSSH=3.6.1p2
OpenSSH=3.9
OpenSSH=3.0
OpenSSH=1.2.1
OpenSSH=2.2
OpenSSH=3.2
OpenSSH=3.6
OpenSSH=1.2.3
OpenSSH=3.7
OpenSSH=4.0p1
OpenSSH=3.5p1
OpenSSH=3.0.1p1
OpenSSH=4.4
OpenSSH=3.7.1p1
OpenSSH=2.1
OpenSSH=1.2
OpenSSH=3.3
OpenSSH=3.2.2p1
OpenSSH=3.9.1p1
OpenSSH=3.0.2
OpenSSH=3.4p1
OpenSSH=3.6.1p1
OpenSSH=3.0.1
OpenSSH=2.9.9
OpenSSH=3.6.1
OpenSSH=4.1p1
OpenSSH=1.2.2
OpenSSH=4.2p1
OpenSSH=4.5
OpenSSH=2.9p1
OpenSSH=2.9
OpenSSH=3.7.1
OpenSSH=1.2.27
OpenSSH=4.2
OpenSSH=2.5.2
OpenSSH=2.3
OpenSSH=3.4
OpenSSH=4.4p1
OpenSSH=4.3p1
OpenSSH=3.5
OpenSSH=2.5
OpenSSH=3.0p1
OpenSSH=3.3p1
OpenSSH=4.3
OpenSSH=4.0
OpenSSH=3.9.1
OpenSSH=2.9p2
OpenSSH=4.6

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2007-2243?

    CVE-2007-2243 is considered a medium severity vulnerability due to the exposure of user account existence.

  • How do I fix CVE-2007-2243?

    To mitigate CVE-2007-2243, disable ChallengeResponseAuthentication in the OpenSSH configuration.

  • Who is affected by CVE-2007-2243?

    CVE-2007-2243 affects OpenSSH versions 4.6 and earlier.

  • What are the potential impacts of CVE-2007-2243?

    Exploitation of CVE-2007-2243 can allow attackers to enumerate valid user accounts.

  • What configurations are related to CVE-2007-2243?

    CVE-2007-2243 involves the configuration setting ChallengeResponseAuthentication in OpenSSH.

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