Executive Summary

Summary
Title Cisco IOS denial of service vulnerability
Informations
Name VU#936177 First vendor Publication 2008-03-26
Vendor VU-CERT Last vendor Modification 2008-03-27
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
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Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.1 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
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Detail

Vulnerability Note VU#936177

Cisco IOS denial of service vulnerability

Overview

A vulnerability in the way Cisco IOS handles IPv6 packets could result in a remotely exploitable denial of service.

I. Description

The Cisco Internetwork Operating System (IOS) includes support for processing Internet Protocol version 6 (IPv6) packets.

Per Cisco Advisory cisco-sa-20080326-IPv4IPv6:

    A device running Cisco IOS software that has Internet Protocol version 6 (IPv6) enabled may be subject to a denial of service (DoS) attack. For the device to be affected by this vulnerability the device also has to have certain Internet Protocol version 4 (IPv4) User Datagram Protocol (UDP) services enabled. To exploit this vulnerability an offending IPv6 packet must be targeted to the device. Packets that are routed throughout the router can not trigger this vulnerability. Successful exploitation will prevent the interface from receiving any additional traffic. The only exception is Resource Reservation Protocol (RSVP) service, which if exploited, will cause the device to crash. Only the interface on which the vulnerability was exploited will be affected.

II. Impact

A remote, unauthenticated attacker could cause a vulnerable system to crash or stop forwarding network traffic.

III. Solution

Upgrade

Cisco has made updates available to address this issue.

Disable IPv6

If it is not needed, disabling IPv6 access will mitigate this vulnerability. See the workarounds section of cisco-sa-20080326-IPv4IPv6 for more information.

Disable IPv4 UDP

If it is not needed, disabling UDP on IPv4 enabled interfaces will mitigate this vulnerability. See the workarounds section of cisco-sa-20080326-IPv4IPv6 for more information.

Systems Affected

VendorStatusDate Updated
Cisco Systems, Inc.Vulnerable26-Mar-2008

References


http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
http://tools.ietf.org/html/rfc2460
http://en.wikipedia.org/wiki/Ipv6

Credit

Thanks to Cisco for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

Date Public03/26/2008
Date First Published03/26/2008 02:36:56 PM
Date Last Updated03/27/2008
CERT Advisory 
CVE NameCVE-2008-1153
US-CERT Technical Alerts 
Metric10.55
Document Revision13

Original Source

Url : http://www.kb.cert.org/vuls/id/936177

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:5860
 
Oval ID: oval:org.mitre.oval:def:5860
Title: Cisco IOS UDP for IPv4/IPv6 Unspecified Vulnerability
Description: Cisco IOS 12.1, 12.2, 12.3, and 12.4, with IPv4 UDP services and the IPv6 protocol enabled, allows remote attackers to cause a denial of service (device crash and possible blocked interface) via a crafted IPv6 packet to the device.
Family: ios Class: vulnerability
Reference(s): CVE-2008-1153
 Version: 1
Platform(s): Cisco IOS
 Product(s):
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 2
Os 2

Open Source Vulnerability Database (OSVDB)

Id Description
43797 Cisco IOS Crafted IPv6 UDP Delivery Remote DoS

Nessus® Vulnerability Scanner

Date Description
2010-09-01 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20080326-IPv4IPv6http.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
Date Informations
2014-02-17 12:08:17
  • Multiple Updates
2013-05-11 00:57:29
  • Multiple Updates