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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0539 -- Sun Alert Notification 101810 Security Vulnerability in the Kerberos krb5_recvauth() Library 13 July 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Kerberos krb5_recvauth() Library Sun Enterprise Authentication Mechanism (SEAM) Publisher: Sun Microsystems Operating System: Solaris 10 Solaris 9 Solaris 8 Solaris 7 Impact: Root Compromise Denial of Service Access: Remote/Unauthenticated CVE Names: CAN-2005-1689 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-101810-1 - --------------------------BEGIN INCLUDED TEXT-------------------- Sun(sm) Alert Notification * Sun Alert ID: 101810 * Synopsis: Security Vulnerability in the Kerberos krb5_recvauth() Library * Category: Security * Product: Solaris 9 Operating System, Solaris 10 Operating System, Sun Enterprise Authentication Mechanism Software, Solaris 7 Operating System, Solaris 8 Operating System * BugIDs: 6284864 * Avoidance: Workaround * State: Workaround * Date Released: 12-Jul-2005 * Date Closed: * Date Modified: 1. Impact An unprivileged (either authenticated or unauthenticated) remote user may be able to execute arbitrary code with elevated privileges on Kerberos systems due to a double-free error in the krb5_recvauth() library routine. The privileges attained would depend on the affected program that utilizes the krb5_recvauth() routine; some affected applications such as kpropd() run with root privileges on slave Key Distribution Center (KDC) hosts, which means its potentially possible to compromise an entire Kerberos realm. This issue is described in MIT krb5 Security Advisory 2005-003 available at http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-003-recvauth.txt This issue is also referenced in the following documents: CAN-2005-1689 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1689 CERT VU#623332 at http://www.kb.cert.org/vuls/id/623332. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * SEAM 1.0 for Solaris 7 * Solaris 8 * Solaris 9 * Solaris 10 x86 Platform * SEAM 1.0 for Solaris 7 * Solaris 8 * Solaris 9 * Solaris 10 Notes: 1. Only systems configured to utilize Kerberos are affected by this issue. 2. Solaris Enterprise Authentication Mechanism (SEAM) is an unbundled product available for Solaris 7, 8 and 9. For more information on SEAM, please see the SEAM(5) man page. 3. Different components of the SEAM product have migrated to Solaris over time and thus Solaris 8 and 9 are impacted while SEAM for Solaris 8 and 9 is not. This is also the reason that there is no SEAM product for Solaris 10. To determine if a system is configured to utilize Kerberos, the following command can be run: $ grep default_realm /etc/krb5/krb5.conf | grep -v ___default_realm___ If the command returns no output or the "krb5.conf" file is not found, then the system is not configured for Kerberos. To determine if SEAM has been installed, the following command can be run: $ pkginfo SUNWkr5sv If the SUNWkr5sv package is present, SEAM is installed on the system. 3. Symptoms There are no reliable symptoms that would indicate the described issues have been exploited to execute arbitrary commands as root on a Kerberos host. 4. Relief/Workaround This Sun Alert will be updated as more information is known. 5. Resolution A final resolution is pending completion. 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 2000-2005 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 iQCVAwUBQtTSASh9+71yA2DNAQKECAP+M/Dx8Y8jgFpnxSqF7yxMGzmCkCle/6fh TuHvJ5CDECD6XTrzRxN+lyt+dmjR9mtfOFmTyxJ5Ghn2BfcslwWLTV+zBWn+N3Ab FPvFh8YHcdiQ0xbq+2XHWYrFLITMJIyRjr0sxxozUmy0JDcjCB4NWxSFzqXMbiiz /9qjCU+MKUo= =9wxd -----END PGP SIGNATURE-----