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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.0242 AIX OpenSSH Vulnerability 25 February 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenSSH Publisher: IBM Operating System: AIX Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2013-4548 Reference: ESB-2013.1598 Original Bulletin: http://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Fri Feb 21 11:19:24 CDT 2014 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc https://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc ftp://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: AIX OpenSSH Vulnerability PLATFORMS: AIX 5.3, 6.1 and 7.1 VIOS 2.X and 1.5.2 SOLUTION: Apply the fix as described below. THREAT: See below CVE Numbers: CVE-2013-4548 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION (From cve.mitre.org) CVE-2013-4548 The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote i authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4548 II. CVSS CVSS Base Score: 6.0 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/88624 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:M/Au:S/C:P/I:P/A:P) III. PLATFORM VULNERABILITY ASSESSMENT The following fileset levels are vulnerable: AIX: 7.1, 6.1, 5.3: all versions less than or equal to 6.0.0.6103 VIOS: 2.X and 1.5.2: all versions less than or equal to 6.0.0.6103 Note: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. IV. 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 OpenSSH_6.0.0.6104.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 . OpenSSH_6.0.0.6104 To install the fix package: installp -aXYd . OpenSSH_6.0.0.6104 V. WORKAROUNDS There are no workarounds. VI. 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/onvdq 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: 0x28BFAA12 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. VII. REFERENCES: Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2 X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/88624 CVE-2013-4548: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4548 *The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Flash. Note: According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (AIX) iEYEARECAAYFAlMHr7wACgkQ4fmd+Ci/qhJ0AwCeNvihZgSW+icww7fMAny7wAG5 H+IAoIBpzKcl43NnQ02ooXYF96eoxeuq =MM/f - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUwvrGxLndAQH1ShLAQLTEA//djW+xaZUXDIQeUV5iHr12Npb9INxHFrn U4YLuMxgwnWcUPOVo1TZIqYVlvjVEtXlzdnTjT1TnCpiIhAmk02qgJ8fEk3Uq9QH 0xxcNpi+dgnIOHCZMU1zONIMsG3n30RsNXlq4NGAMirP4c3T+A6Vxr9/YN60uUGi 2kh+UFePtwqzQ/MKpVQtRB0Co/EPSJ7UWuQ8J85EnFpRtulXDtF2nVIgKsswY1Ko iJnePiS60vtpHXWmS7jiBcka9l9mZV+OkpOoJdk8xXrFRqi9u59znhkz2xgWNu3g jOO5JJmaikxjlCDicua/duJ1tsR55Gd4yavmphxV7chNwKyOd0s1LwL4hfmUXnob DdRJ+02pVC5apBjmRC+SXEnXn+CTMhtw8bFoFT7j+bTIFixMQZJIEe7vzBAk6ihP 2msQ48Bt2E5gE6RDIlnU3Lc62vr8rHh1odnjSVyLdG8om46q0wzXNZJtYDQfqSLf mbwvHBqgw0thT780MY7RXrFhehJlufrinVZ22rGUL+pkfJrMTL2fTFMcIamuA2L3 eSPkYS2IlNbsF7idpHymj+hgeB+BGJ8OwAZmAMZDvBW+RFlAAG1V4/g4XVWu+qUy 5zNSwmD65lOhxZ2y13x9MkH2QXtOs+H8MWAdNlc58LGTtZIKgQxWRD0YmCRknaeV /uXphBnPOnM= =h7zy -----END PGP SIGNATURE-----