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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.0110 -- [Solaris] Security Vulnerability in OpenSSL due to Improper Usage of Signature 17 April 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solaris 10 Operating System OpenSolaris Publisher: Sun Microsystems Operating System: Solaris Impact: Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-5077 Ref: ESB-2009.0038 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-250826-1 Revision History: April 17 2009: Patches released February 20 2009: Workaround added February 2 2009: Signed with new key February 2 2009: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 250826 : Security Vulnerability in OpenSSL due to Improper Usage of Signature Bug ID: 6786120 Product Solaris 10 Operating System OpenSolaris Date of Preliminary Release: 29-Jan-2009 Date of Workaround Release: 18-Feb-2009 Date of Resolved Release: 16-Mar-2009 SA Document Body Security vulnerability in OpenSSL due to improper usage of signature verification: 1. Impact An insufficient validation security vulnerability in OpenSSL may allow a malformed signature to be treated as a good signature rather than as an error. This issue affects the signature checks on DSA keys used with SSL/TLS. This vulnerability may allow a remote user who is in control of a rogue server or who can use a "man-in-the-middle attack" to masquerade as a valid, legitimate server using malformed SSL certificates. Sun acknowledges with thanks, Google Security Team for bringing this issue to our attention. This issue is also referenced in the following document: * CVE-2008-5077 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5077 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 without patch 139500-03 * OpenSolaris based upon builds snv_01 through snv_106 x86 Platform * Solaris 10 without patch 139501-02 * OpenSolaris based upon builds snv_01 through snv_106 Note 1: Solaris 8 is not impacted by this issue. Note 2: Solaris 9 does not ship with OpenSSL libraries which can be used for third-party application usage. WANboot in Solaris 9 which contains libssl, is only capable of using RSA certificates and hence not affected. Note 3: OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived. To determine the base build of OpenSolaris, the following command can be used: $ uname -v snv_86 Note 4: Only OpenSolaris installations including the affected binary "/usr/sfw/bin/openssl" or "/usr/lib/libssl.so" are impacted by this issue. Note 5: Use of OpenSSL as an SSL/TLS client when connecting to a server whose certificate contains a RSA key is not affected. Verification of client certificates by OpenSSL servers for *any* key type is not affected. Note 6: To determine if a server certificate contains a DSA key, inspect the "Subject Public Key Info" section. This can be done using the command: $ openssl x509 -in server-certificate.pem -text ... Subject Public Key Info: Public Key Algorithm: dsaEncryption DSA Public Key: ... 3. Symptoms There are no predictable symptoms that would indicate the described issue has occurred. 4. Workaround There is no workaround for this issue. Please see the Resolution section below. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 10 with patch 139500-03 or later * OpenSolaris based upon builds snv_107 or later x86 Platform * Solaris 10 with patch 139501-02 or later * OpenSolaris based upon builds snv_107 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 2000-2009 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 iD8DBQFJ59T4NVH5XJJInbgRAoLDAJ4uwfQpoDZt7iHBcBHW0zHzxcaI3gCePkNq o2Tj0YONTAuGtfWaOdNgX8M= =SE71 -----END PGP SIGNATURE-----