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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0776 -- [Cisco] Cisco IOS Line Printer Daemon (LPD) Protocol Stack Overflow 15 October 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS Line Printer Daemon (LPD) Publisher: Cisco Systems Operating System: Cisco Impact: Execute Arbitrary Code/Commands Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2007-5381 Original Bulletin: http://www.cisco.com/warp/public/707/cisco-sr-20071010-lpd.shtml Comment: This requires the ability to control the hostname of the router. It also requires the LPD service to be started (disabled by default). Revision History: October 15 2007: Added CVE October 11 2007: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Security Response: Cisco IOS Line Printer Daemon (LPD) Protocol Stack Overflow Document ID: 99109 http://www.cisco.com/warp/public/707/cisco-sr-20071010-lpd.shtml Revision 1.0 For Public Release 2007 October 10 1600 UTC (GMT) - - --------------------------------------------------------------------- Cisco Response ============== This is the Cisco Product Security Incident Response Team (PSIRT) response to an issue discovered and reported to Cisco by Andy Davis from IRM, Plc. regarding a stack overflow in the Cisco IOS Line Printer Daemon (LPD) Protocol feature. The original post is available at the following link: http://www.irmplc.com/index.php/155-Advisory-024 Cisco greatly appreciates the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports. Additional Information ====================== Cisco has confirmed the security research's findings and has documented this issue in Cisco Bug ID CSCsj86725. All versions of IOS that support the LPD functionality except the ones listed below are affected. Customers that do not enable the LPD functionality are not affected. Note: LPD is disabled by default on Cisco IOS routers. If LPD services are configured, then one or more global printer <name> command lines would be present in the router's configuration. No other Cisco products are currently known to be affected by this vulnerability. This issue has been fixed on versions 12.2(18)SXF11, 12.4(16a), 12.4(2)T6 and later. For more information please view the bug's details via the Bug Toolkit on Cisco.com. Workaround ========== If LPD services are not required, they can be disabled by using the no printer command; thus, eliminating this vulnerability. Note: LPD is disabled by default on Cisco IOS routers. In addition, LPD uses TCP port 515. An access control list (ACL) can be configured to only allow trusted devices to communicate to the router via TCP port 515. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. Revision History ================ +---------------------------------------+ | Revision | | Initial | | 1.0 | 2007-October-10 | public | | | | release. | +---------------------------------------+ Cisco Security Procedures ========================= Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. 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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 iQCVAwUBRxLAsih9+71yA2DNAQLkWQP9FiRLYtmLkz2Egj8Q2Yy3r5gU7BQJhHzF PF17Sx3xA2GvAqQYs/Xol92yxVPSrCVIFrXBTbyXblNYo0qefoQWJY1Kyodz49wk l4bo8WVkxau53nkbe7oh3PGMNHJK18DInyVVyclMmKqzu0NG3/QoZ5iSDiEIck63 MOW8GYW4hlE= =wcS1 -----END PGP SIGNATURE-----