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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.0039
              AIX OpenSSL session renegotiation vulnerability
                              14 January 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           OpenSSL
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Unauthorised Access            -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3555  

Reference:         ASB-2009.1125.2

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/ssl_advisory.asc

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IBM SECURITY ADVISORY

First Issued: Wed Jan 13 09:17:27 CST 2010

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/ssl_advisory.asc
or
ftp://aix.software.ibm.com/aix/efixes/security/ssl_advisory.asc

                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX OpenSSL session renegotiation vulnerability

PLATFORMS:       AIX 5.3, 6.1, and earlier releases

SOLUTION:        Apply the fix as described below.

THREAT:          See below

CERT VU Number:  120541
CVE Numbers:     CVE-2009-3555

                           DETAILED INFORMATION

I. DESCRIPTION (from US-CERT)

    "A vulnerability in the way SSL and TLS protocols allow
    renegotiation requests may allow an attacker to inject plaintext
    into an application protocol stream. This could result in a
    situation where the attacker may be able to issue commands to the
    server that appear to be coming from a legitimate source."

    "A remote, unauthenticated attacker may be able to inject an
    arbitrary amount of chosen plaintext into the beginning of the
    application protocol stream. This could allow and attacker to
    issue HTTP requests, or take action impersonating the user, among
    other consequences."

    Please see the following for more information:

    http://www.kb.cert.org/vuls/id/120541
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555

    Please note that this fix will will disable all session
    renegotiation.

II. PLATFORM VULNERABILITY ASSESSMENT

    To determine if your system is vulnerable, execute the following
    command:

    lslpp -L openssl.base

    The following fileset levels are vulnerable:

    AIX 6.1 and 5.3: all versions less than 0.9.8.1102
    AIX 6.1 and 5.3: FIPS capable versions less than 12.9.8.1102
    AIX 5.2: all versions less than 0.9.8.805

    IMPORTANT: If AIX OpenSSH is in use, it must be updated to version
    5.0 or later when updating OpenSSL.

    AIX OpenSSH can be downloaded from:

    http://sourceforge.net/projects/openssh-aix

III. FIXES

    A fix is available, and it can be downloaded from:

    https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

    To extract the fixes from the tar file:

    zcat openssl.0.9.8.1102.tar.Z | tar xvf -
    or
    zcat openssl-fips.12.9.8.1102.tar.Z | tar xvf -
    or
    zcat openssl.0.9.8.805.tar.Z | tar xvf -

    IMPORTANT: If possible, it is recommended that a mksysb backup
    of the system be created.  Verify it is both bootable and
    readable before proceeding.

    To preview the fix installation:

    installp -apYd . openssl

    To install the fix package:

    installp -aXYd . openssl

IV. WORKAROUNDS

    There are no workarounds.

V. CONTACT INFORMATION

    If you would like to receive AIX Security Advisories via email,
    please visit:

        http://www.ibm.com/systems/support

    and click on the "My notifications" link.

    To view previously issued advisories, please visit:

        http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
 
    Comments regarding the content of this announcement can be
    directed to:

        security-alert@austin.ibm.com

    To obtain the PGP public key that can be used to communicate
    securely with the AIX Security Team you can either:

        A. Send an email with "get key" in the subject line to:

            security-alert@austin.ibm.com

        B. Download the key from our web page:

  http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt

        C. Download the key from a PGP Public Key Server. The key ID is:

            0xF3807ECD

    Please contact your local IBM AIX support center for any
    assistance.

    eServer is a trademark of International Business Machines
    Corporation.  IBM, AIX and pSeries are registered trademarks of
    International Business Machines Corporation.  All other trademarks
    are property of their respective holders.

VI. ACKNOWLEDGEMENTS

    This vulnerability was reported by Marsh Ray of PhoneFactor. This
    vulnerability was also independently discovered and publicly
    disclosed by Martin Rex of SAP.

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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If you believe that your computer system has been compromised or attacked in 
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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
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