ID

VAR-201101-0315

CVE

CVE-2010-4671

TITLE

Cisco IOS of Neighbor Discovery Service disruption in protocol implementation (DoS) Vulnerabilities

DESCRIPTION

The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS before 15.0(1)XA5 allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, as demonstrated by the flood_router6 program in the thc-ipv6 package, aka Bug ID CSCti33534. Cisco IOS of IPv6 In the stack Neighbor Discovery Protocol implementation includes service disruption (DoS) There is a vulnerability that becomes a condition. Multiple vendors' products are prone to an IPv6-related denial-of-service vulnerability. A remote attacker can exploit this issue to make affected computers and devices unresponsive, denying service to legitimate users. Cisco IOS is an operating system developed by Cisco in the United States for its network equipment. This security advisory is released because Microsoft doesnt want to fix the issue. Cisco did for its IOS and ASA within 3 months. ________________________________________________________________________ Title: ICMPv6 Router Announcement flooding denial of service affecting multiple systems Date: 05 April 2011 URL: http://www.mh-sec.de/downloads/mh-RA_flooding_CVE-2010-multiple.txt ________________________________________________________________________ Vendors: Cisco, Juniper, Microsoft, FreeBSD Affected Products: All Cisco IOS ASA with firmware < November 2010 All Netscreen versions All Windows versions All FreeBSD version Vulnerability: ICMPv6 Router Announcement flooding denial of service Severity: 7.8 (CVE CVSS Score), local network CVEs: CVE-2010-4670, CVE-2010-4671, CVE-2010-4669 ________________________________________________________________________ Update Section: 05 April 2011 Initial release ________________________________________________________________________ Overview: When flooding the local network with random router advertisements, hosts and routers update the network information, consuming all available CPU resources, making the systems unusable and unresponsive. As IPv6 and autoconfiguration are enabled by default, all are affected in their default configuration. For Windows, a personal firewall or similar security product does not protect against this attack. Note: Microsoft does not want to fix this security issue for their products. Impact: Updating the routing tables and configuring IPv6 addresses take up all available CPU resources. Routers and firewalls do not forward traffic. The denial of service is in affect until the flooding is terminated. The exact impact differs from the affected system type: Cisco: 100% traffic loss with autconfiguration active, 80% without. Netscreen: Only affected when the interface is configured as host, traffic is forwarded until the neighbor information times out, then the traffic is lost Windows: 100% CPU, 100% RAM FreeBSD: 100% CPU, additionally IPv6 support can be lost until reboot occasionally. Old Linux kernels are also affected, detailed version information unknown. Description: On IPv6 networks, hosts automatically find out about available routers via ICMPv6 router announcements which are sent by the routers. Additionally, router announcemens are used to replace DHCP by the so called autoconfiguration feature. Windows and FreeBSD - like all modern operating systems - enable IPv6 and autoconfiguration by default and are thereby vulnerable. A personal firewall will not protect against this attack. If a system receives a router announcement of a new router, it updates its routing table with the new router, and if the autoconfiguration flag is set on the announcement (and the host is configured to configure its IPv6 address by this mechanism), the host chooses an IPv6 address from the announced network space. If a network is flooded with random router announcements, systems scramble to update their routing tables and configure IPv6 addresses. Exploit: Flood the network with router advertisements coming from different routers and announcing different network prefixes. A tool to test for this vulnerability is included in the thc-ipv6 package, called flood_router6. Solution: Cisco: IOS fix CSCti24526 , ASA fix CSCti33534 Linux: fixed prior 2010 Netscreen: Juniper waiting for IETF results for how to fix the issue FreeBSD: unknown Windows: Microsoft made clear that they do not plan to issue a fix for this security issue. Workaround: The procession of router announcements must be disabled. Please consult your system manual on how to this for your affected platform. Alternatively, disable IPv6. ________________________________________________________________________ Vendor communication: 10 July 2010 Microsoft informed 10 July 2010 Cisco informed 01 August 2010 Cisco confirms problem, announces fix for October 12 August 2010 Microsoft confirms vulnerability, states no fix will be supplied. 22 November 2010 Cisco confirms fixes are available and started to be deployed in current firmwares 28 December 2010 vendor-sec informed (among other issues) 05 February 2011 FreeBSD informed (made aware via vendor-sec 5 weeks before) 20 February 2011 Juniper informed 09 March 2011 Juniper confirms problem 01 April 2011 Juniper informs that they work with the IETF to develop a standard method to cope with this and similar attacks. ________________________________________________________________________ Contact: Marc Heuse mh@mh-sec.de http://www.mh-sec.de ________________________________________________________________________ The information provided is released "as is" without warranty of any kind. The publisher disclaims all warranties, either express or implied, including all warranties of merchantability. No responsibility is taken for the correctness of this information. In no event shall the publisher be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if the publisher has been advised of the possibility of such damages. The contents of this advisory is copyright (c) 2010,2011 by Marc Heuse and may be distributed freely provided that no fee is charged for the distribution and proper credit is given. ________________________________________________________________________ -- Marc Heuse www.mh-sec.de PGP: FEDD 5B50 C087 F8DF 5CB9 876F 7FDD E533 BF4F 891A . ---------------------------------------------------------------------- Secure your corporate defenses and reduce complexity in handling vulnerability threats with the new Secunia Vulnerability Intelligence Manager (VIM). Request a free trial: http://secunia.com/products/corporate/vim/ ---------------------------------------------------------------------- TITLE: Cisco IOS Multiple Vulnerabilities SECUNIA ADVISORY ID: SA42917 VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/42917/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=42917 RELEASE DATE: 2011-01-18 DISCUSS ADVISORY: http://secunia.com/advisories/42917/#comments AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s) http://secunia.com/advisories/42917/ ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS https://ca.secunia.com/?page=viewadvisory&vuln_id=42917 ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/ DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious users to bypass certain security restrictions and by malicious people to cause a DoS (Denial of Service). 1) An error when processing certain IRC traffic can be exploited to cause a device reload by accessing an IRC channel within 36 hours of a reload. 2) An error in the CME (Communication Manager Express) component when handling a SNR number change menu from an extension mobility phone can be exploited to crash the device. 3) A memory leak when processing UDP SIP REGISTER packets can be exploited to exhaust memory resources via a specially crafted SIP packet. 4) An error in the PKI implementation does not clear the public key cache for the peers when the certificate map is changed. This can be exploited to reconnect and bypass the certificate ban. 5) A memory fragmentation error in the CME (Communication Manager Express) component when handling SIP TRUNK traffic can be exploited to exhaust memory resources via specially crafted SIP packets. PROVIDED AND/OR DISCOVERED BY: Reported by the vendor. ORIGINAL ADVISORY: Cisco: http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities. 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AFFECTED PRODUCTS