CERT Advisory Notice: Clarifications regarding recent vulnerabilities in OpenSSH

From: CERT Advisory (cert-advisory_at_cert.org)
Date: 09/30/03

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    Date: Mon, 29 Sep 2003 18:24:10 -0400
To: cert-advisory@cert.org

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    CERT Advisory Notice: Clarifications regarding recent vulnerabilities in OpenSSH

    The CERT/CC has received queries regarding several recent OpenSSH
    vulnerabilities. We are sending this message to help ensure that
    administrators have not overlooked one or more of these vulnerabilities.

    There have been several recent vulnerabilities affecting OpenSSH. They
    are

    VU#333628 - OpenSSH contains buffer management errors
    http://www.kb.cert.org/vuls/id/333628

        This issue addresses two releases of OpenSSH to resolve multiple
        issues in the buffer management code. It is unclear if these issues
        are exploitable, but they are resolved in version 3.7.1. Note that
        there are other additional flaws in the buffer management code as
        reported by Openwall GNU/*/Linux in
        http://www.kb.cert.org/vuls/id/JARL-5RFQQZ. These four additional
        flaws are believed to be relatively minor, and are scheduled to be
        included in the next version of OpenSSH.

    VU#602204 - OpenSSH PAM challenge authentication failure
    http://www.kb.cert.org/vuls/id/602204

       Under non-standard configurations, portable versions of OpenSSH 3.7p1
       and 3.7.1p1 are vulnerable to a remotely exploitable vulnerability.
       Exploitation of this vulnerability may lead to a remote attacker
       gaining privileged access to the server, in some cases root access.

    VU#209807 - Portable OpenSSH server PAM conversion stack corruption
    http://www.kb.cert.org/vuls/id/209807

       There is a vulnerability in portable versions of OpenSSH 3.7p1 and
       3.7.1p1 that may permit an attacker to corrupt the PAM conversion
       stack. The complete impact of this vulnerability is unclear, but may
       lead to privilege escalation, or a denial of service.

    Please check the vulnerability notes for resolutions and additional
    details.

    Thank you.

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