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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.1104 -- [Solaris] A Security Vulnerability in the OpenSSL PKCS#11 Engine May Result in Denial of Service (DoS) Due to a Corrupted Session Cache 12 December 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solaris 10 Operating System Publisher: Sun Microsystems Operating System: Solaris Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2008-5410 Original Bulletin: http://sunsolve.sun.com/search/document.do?assetkey=1-66-246846-1 Revision History: December 12 2008: Added CVE December 9 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 246846 : A Security Vulnerability in the OpenSSL PKCS#11 Engine May Result in Denial of Service (DoS) Due to a Corrupted Session Cache Bug ID 6602801 Product Solaris 10 Operating System Date of Resolved Release 03-Dec-2008 SA Document Body A Security Vulnerability in the OpenSSL PKCS#11 Engine May Result in Denial of Service (DoS) Due to a Corrupted Session Cache 1. Impact A security vulnerability in the OpenSSL PKCS#11 engine as shipped with Solaris 10 may affect applications which make use of this engine. The exact impact will vary depending on the application. This vulnerabiltiy may allow a local or remote unprivileged user to cause certain cryptographic operations within the application to fail (namely RSA_sign and RSA_verify), which is a type of Denial of Service (DoS). For example, if the OpenSSL PKCS#11 engine is used for SSL processing (for example, in the Apache webserver) it will result in SSL connections being dropped in the SSL handshake phase, thereby causing a Denial Of Service (DoS) due to a corrupted session cache. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 without patch 139459-01 x86 Platform * Solaris 10 without patch 138863-02 Notes: 1. Solaris 8 and 9 and OpenSolaris are not impacted by this issue since they do not ship with the OpenSSL PKCS#11 engine. 2. This issue only impacts applications making use of the OpenSSL PKCS#11 engine. The exact method for determining whether an application is making use of this functionality will vary depending on the application. 3. Symptoms The symptoms will vary depending on the application. For example, if the OpenSSL PKCS#11 engine is used for SSL processing, failed SSL handshakes may be observed as in the following example (from the Apache debug log file): [Thu Sep 06 08:28:05 2008] [info] [client 192.0.2.1] SSL library error 1 in handshake (server ssl-server.example.com:443) [Thu Sep 06 08:28:05 2008] [info] SSL Library Error: 336105650 error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned [Thu Sep 06 08:28:05 2008] [info] SSL Library Error: 2148044919 error:80089077:lib(128):PK11_DESTROY_OBJECT:C_DestroyObject failed [Thu Sep 06 08:28:05 2008] [info] [client 192.0.2.1] Connection closed to child 126 with abortive shutdown (server ssl-server.example.com:443) 4. Workaround Until patches can be applied, sites may wish to disable the OpenSSL PKCS#11 engine altogether or just for RSA/DSA/DH functions (if possible) so that crypto processing will be done only via native OpenSSL routines. This may degrade the performance depending on how the engine is used and on the hardware crypto providers present in the system. The method for doing this will vary depending on the application, and the documentation should be consulted for more details. For example, to disable the OpenSSL PKCS#11 engine in the Apache web server (see apache(1M)), comment out the following line from the SSL configuration file and restart the Webserver: SSLCryptoDevice "pkcs11" For Apache server shipped with Solaris 10, this directive is configured in '/etc/apache/httpd.conf' or '/etc/apache2/ssl.conf'. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 10 with patch 139459-01 or later x86 Platform * Solaris 10 with patch 138863-02 or later For more information on Security Sun Alerts, see Technical Instruction ID 213557. This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements. Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved. - --------------------------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 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT 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 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 iQCVAwUBSUHNuih9+71yA2DNAQJTXgP/TGj6hfhn4jlPguFzPKduI5BRU/act5Vr KWPdy7Tk0kqydFaBNtsgZEVNI/CXUeFDVHUFCY7NVfim2zhSG4N5yqrfFvVGl1gH aRNIzUKSdOe4rw4gIcEpHBY0dNC6bepwtGlK+mxaj6WApYIzuI41x+9zzRBGMmE0 qJefTbr/M3A= =m8Ig -----END PGP SIGNATURE-----