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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0250 -- Sun Alert Notification 57755 Buffer Overflow in telnet(1) Client Software 30 March 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: telnet Publisher: Sun Microsystems Operating System: Solaris Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CAN-2005-0469 Ref: ESB-2005.0244 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57755-1 - --------------------------BEGIN INCLUDED TEXT-------------------- Sun(sm) Alert Notification * Sun Alert ID: 57755 * Synopsis: Buffer Overflow in telnet(1) Client Software * Category: Security * Product: Solaris * BugIDs: 6234932 * Avoidance: Workaround * State: Committed * Date Released: 28-Mar-2005 * Date Closed: * Date Modified: 1. Impact There is a buffer overflow in the unprivileged telnet(1) utility. This is not a security vulnerability on its own. However, telnet(1) communicates with another host using the TELNET protocol and thus there is a small risk of a remote user successfully exploiting the overflow. If a remote unprivileged user is able to cause a user to execute the telnet(1) utility on their client system, then that remote user may be able to execute arbitrary commands on the client system with the privileges of the user who executed telnet(1). This issue is described in CAN-2005-0469 at [2]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469 Sun acknowledges with thanks, iDEFENSE ([3]http://www.idefense.com), for bringing this issue to our attention. This issue is also referenced in the following iDEFENSE documents: IDEF0866 - Multiple Telnet Client slc_add_reply() Buffer Overflow IDEF0867 - Multiple Telnet Client env_opt_add() Buffer Overflow which can be found at: [4]http://www.idefense.com/application/poi/display?type=vulnerabilitie s (3.28.05) 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 7 * Solaris 8 * Solaris 9 * Solaris 10 x86 Platform * Solaris 7 * Solaris 8 * Solaris 9 * Solaris 10 3. Symptoms There are no predictable symptoms that would indicate the described issue has been exploited. Solution Summary [5]Top 4. Relief/Workaround To work around the described issue until patches are available, sites may consider removing the execute permissions from the Solaris telnet(1) utility. To accomplish this, the following command can be run (as "root"): # chmod 000 /usr/bin/telnet To restore the original permissions to the telnet(1) utility (after the patches have been applied) the following command can be run (as "root"): # chmod 555 /usr/bin/telnet 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. References 1. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57755-1#top 2. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469 3. http://www.idefense.com/ 4. http://www.idefense.com/application/poi/display?type=vulnerabilities 5. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57755-1#top - --------------------------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 iQCVAwUBQknvUCh9+71yA2DNAQLWGQP+NMxXnaUh9MLcCgswSWwp4tKFc6cO/4At PkDE46NLUH+FMaXKN2ck0sx6vhFy+jXOPZvmli6rOSmqXOZ6t/bjM30g0KC4ZtK2 xOwlV8pH8IPWDVUZNS27C513RauhsnTFo89KJWowH6z2TLGXMD0K2ymS7CcD/pib RzeoI1TZVIs= =7BS/ -----END PGP SIGNATURE-----