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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.2236 Cisco IOS XR Software lighttpd TCP Session Vulnerability 27 November 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XR Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2014-8005 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=36532 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco IOS XR Software lighttpd TCP Session Vulnerability Threat Type: CWE-362: Race Conditions IntelliShield ID: 36532 Version: 1 First Published: 2014 November 25 22:45 GMT Last Published: 2014 November 25 22:45 GMT Port: Not available CVE: CVE-2014-8005 BugTraq ID: 71287 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 5.0 CVSS Temporal: 4.1 Version Summary: Cisco IOS XR Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in the lighttpd module of Cisco IOS XR could allow an unauthenticated, remote attacker to cause a reload of the affected lighttpd process. The vulnerability is due to a race condition while handling TCP sessions to the lighttpd module on the affected Cisco IOS XR device. An attacker could exploit this vulnerability by sending a number of TCP sessions to be established with the lighttpd server on the affected device. An exploit could allow the attacker to cause a reload of the lighttpd process. Cisco has confirmed the vulnerability in a security notice and released software updates. Warning Indicators At the time this alert was first published, Cisco IOS XR Software for Cisco Network Convergence System 6000 Series devices Releases 5.1 and prior were vulnerable. Later releases may also be vulnerable. IntelliShield Analysis To exploit this vulnerability, an attacker may need access to trusted, internal networks behind a firewall to send numerous TCP sessions to the targeted device. This access requirement may reduce the likelihood of a successful exploit. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released a security notice at the following link: CVE-2014-8005 Customers are advised to consult Cisco bug ID CSCuq45239 for a complete list of affected product versions. Impact An unauthenticated, remote attacker could exploit this vulnerability to cause the lighttpd process on an affected device to reload, resulting in a denial of service (DoS) condition. Technical Information The vulnerability is due to a race condition while handling TCP sessions to the lighttpd module on an affected Cisco IOS XR device. An unauthenticated, remote attacker could exploit this vulnerability by sending a number of TCP sessions to be established with the lighttpd server on the affected device. An exploit could allow the attacker to cause a reload of the lighttpd process, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to have network access. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco IOS XR Software 5.1 Base | for Cisco Network Convergence System 6000 Series Routers 5.0.0, 5.0.1 Associated Products: N/A Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment. LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - --------------------------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 =========================================================================== 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 iQIVAwUBVHaSyhLndAQH1ShLAQLvEA/+M73BpGpv20tpbSGx2BGme9BNmXhhwmix lwfr6PoWtasfoqi4CHc9Li3IEOFHZosH1tXZrnYmiFnei/oHCujMJ/0Y8tNRkJiK KzRQnR25uPL7Og9jyfnACuRQeM48nA25PXbyUPw6EbbSkPJ5lPWXTRrwJTZHhD63 VoDuTl9368zGPLp2C1u0hTqdqdSoYBroOFRVc3w7qOLjxYGrYBd+KV6Bc3XJwC3E Y9pcZ9opAPRTky1lUyqYGe4i1XMkKCoJ+7/uoBISvYxBrCUUmrzogMXeOkei78LN xY4Z/6gaKBhm3Hpk2GqOYKo+0oy5XVYYLGeN9zizPCoWc+ksEgH3nWBx4UAFuZRA NQHSLxsXh3f8YeuIVbOmXKEK3gCtrTSDOGXeduFG9kWnpavzqHe5LfH8UvQEZYn7 aJoV+FclaK0KD6OoofffCQpU03NlF+OSBiFjyJM7QxSPmBpJLPchJHvi8X+XZ1AU dPHxrSF9VWEcnrt4dcyUww6wdm0kk/BrOy2BmrSbe70sRT0NafccDbI8WCaWA55M 17MST4YEveSbuQpduRnylv/H6NI4Sz7mV9d5AMljWwr7LRWxkLLhsCsYtAmDwYkV 31cgjnzLCxJbe5fsjN+KuJjPJeTIHx3VNbrlWJ66BTQIiPh+Fgmc7ReENcl3sUQH 4oASZtZR//s= =4Vmv -----END PGP SIGNATURE-----