low
2.1
CWE
200
Advisory Published
CVE Published
Updated

CVE-2011-4327: Infoleak

First published: Mon Nov 21 2011(Updated: )

A security flaw was found in the way ssh-keysign, a ssh helper program for host based authentication, attempted to retrieve enough entropy information on configurations that lacked a built-in entropy pool in OpenSSL (a ssh-rand-helper program would be executed to retrieve the entropy from the system environment). A local attacker could use this flaw to obtain unauthorized access to host keys via ptrace(2) process trace attached to the 'ssh-rand-helper' program. References: [1] <a href="http://www.openssh.com/txt/release-5.8p2">http://www.openssh.com/txt/release-5.8p2</a> [2] <a href="http://www.openssh.com/txt/portable-keysign-rand-helper.adv">http://www.openssh.com/txt/portable-keysign-rand-helper.adv</a> [3] <a href="http://www.nessus.org/plugins/index.php?view=single&amp;id=53841">http://www.nessus.org/plugins/index.php?view=single&amp;id=53841</a> [4] <a href="http://www.openwall.com/lists/oss-security/2011/11/21/11">http://www.openwall.com/lists/oss-security/2011/11/21/11</a> (CVE assignment)

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
OpenSSH=5.4
OpenSSH=2
OpenSSH=3.8
OpenSSH=3.8.1p1
OpenSSH=4.3p2
OpenSSH=3.2.2
OpenSSH=3.1
OpenSSH=5.5
OpenSSH=3.0.2p1
OpenSSH=1.5.8
OpenSSH=5.3
OpenSSH=4.1
OpenSSH=3.8.1
OpenSSH=2.1.1
OpenSSH=3.7.1p2
OpenSSH=4.8
OpenSSH=4.9
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=4.7
OpenSSH=1.5.7
OpenSSH=1.2.3
OpenSSH=3.7
OpenSSH<=5.8
OpenSSH=4.0p1
OpenSSH=3.5p1
OpenSSH=2.3.1
OpenSSH=3.0.1p1
OpenSSH=4.4
OpenSSH=3.7.1p1
OpenSSH=2.1
OpenSSH=1.2
OpenSSH=5.2
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=5.7
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=5.1
OpenSSH=3.0p1
OpenSSH=3.3p1
OpenSSH=5.6
OpenSSH=4.3
OpenSSH=4.0
OpenSSH=3.9.1
OpenSSH=5.0
OpenSSH=1.3
OpenSSH=2.9p2
OpenSSH=1.5
OpenSSH=4.6

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-4327?

    CVE-2011-4327 has been rated as a medium severity vulnerability due to its potential impact on host-based authentication in OpenSSH.

  • How do I fix CVE-2011-4327?

    To fix CVE-2011-4327, update your OpenSSH to a version that includes the patch for this vulnerability.

  • What specific versions of OpenSSH are affected by CVE-2011-4327?

    CVE-2011-4327 affects multiple versions of OpenSSH, specifically versions from 1.2.1 up to but not including 5.8.

  • What impact does CVE-2011-4327 have on systems using OpenSSH?

    CVE-2011-4327 can lead to insufficient entropy in host-based authentication, potentially exposing systems to security risks.

  • Is there a workaround for CVE-2011-4327 if I cannot update OpenSSH?

    As a workaround, consider implementing additional entropy sources or using an alternative authentication method until an update can be applied.

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