23 April 2014
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.0578 Security Bulletin: Vulnerability GSKit Certificate Chain Vulnerability (CVE-2013-6747) 23 April 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM GSKit Publisher: IBM Operating System: AIX HP-UX IBM i Linux variants Solaris Windows i5/OS Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-6747 Reference: ESB-2014.0504 ESB-2014.0379 ESB-2014.0309 ESB-2014.0201 ESB-2014.0113 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21670831 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability GSKit Certificate Chain Vulnerability (CVE-2013-6747) Document information More support for: IBM License Metric Tool Software version: 7.2.2, 7.5 Operating system(s): AIX, AIX 6.1, HP-UX, IBM i, Linux, Solaris, Windows, i5/OS Software edition: All Editions Reference #: 1670831 Modified date: 2014-04-18 Security Bulletin Summary A certificate chain presented by a Client or Server could contain a circular reference that will cause the chain building logic to loop which can lead to a segv crash or hang due to memory exhaustion. Vulnerability Details CVE ID: CVE-2013-6747 IBM CVSS SCORE: 7.1 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/89863 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C) DESCRIPTION: iLMT and TAD4D use GSKit for SSL/TLS connections. The GSKit implementation is vulnerable to an attack from a malformed certificate chain. Were an attacker to use such a certificate when initiating an SSL/TLS connection, they could cause the iLMT/TAD4D server process to hang or crash. The attack does not require local network access or authentication but specialized knowledge and techniques are required. An exploit would not impact the confidentiality of information or the integrity of data, however availability of the system can be compromised. AFFECTED PRODUCTS AND VERSIONS: 7.1.x, 7.2.x and 7.5.x REMEDIATION: Update the system with the latest Interim Fixes available from Passport Advantage. 7.5.x: * TAD4D 22.214.171.124 -> http://www-01.ibm.com/support/docview.wss?uid=swg24033014 * ILMT 126.96.36.199 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032909 7.2.2: * TAD4D 7.2.2 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032997 * LMT 7.2.2 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032962 earlier then 7.2.2: * Contact the support. WORKAROUND: None. MITIGATION: None. REFERENCES: Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/89863 MITRE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-6747 RELATED INFORMATION: IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog References Complete CVSS Guide On-line Calculator V2 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog *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 Security Bulletin. Disclaimer 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. - --------------------------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 email@example.com 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: firstname.lastname@example.org 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 iQIVAwUBU1dZ2xLndAQH1ShLAQKO2xAAtxRazcxGvbR7u1+ZHSVoezx8J10eoV3+ LJBkw0um8HJOIuBlpP7CcIjntYkAMo1nprWUGZdhITBklcm76gBvJxiqW2lr+xs0 0yk3ypzia4kjvizJP7g9umYMYY2kOBQ69TFnFbUerelzH8uaXkxQX84GGypSdFLC a/fea3MFmgH4RUYTVRQouZUTVm9mi74/t8IK9OBT8yYaAvhvyG931zpKjff7j9nv I4h+NDKrl9YSUZ1ZlKlrJHDI46k1yIUXoZxm82l4gKUtdeGNOWVeKyKxFmzUVo7h jwdmv64uVfY7wSeF+Cn5oZRcCBfRa0lXlbHI+01oSDy9gwerRTSR0qYoUKPc2wL5 zP59OEUrRTWZkk+xjHu8G42nNujmgUfwEdfeJGi1/5mY2XB3jfRigjFJ1nX21HCg Cflvnxj6XL6wpYRCUL+EmGzL+BfdCT8n9kNJ5+DqgH3p1Mt7TYwCwx4CCvpchB+V CIBrcZxYfq7t5/vBEleR2cw6kLvlaj8PlRVxgDtjFQbaZLxiVD8fq06p4DMzdIGW qXpmYEhfXHUdQkTollK0h6fYoUGrEw/1I/JaJvKtgrBcuN054ac488LuPCSH3z1d jQOEnWJHTS1IaCg6m2C2/qcvIZ2VZ7z2x85nmHtuut9VjIkN5pbDnRPTMSaSeUKX fZJQslgWlFY= =Pd2a -----END PGP SIGNATURE-----