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Cisco IOS Interface Blocked by IPv4 Packets - Cisco Systems

high Nessus Plugin ID 48971

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. Multiple IPv4 packets with specific protocol fields sent directly to the device may cause the input interface to stop processing traffic once the input queue is full.
Traffic passing through the device cannot block the input queue. No authentication is required to process the inbound packet. Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not affected. Multiple valid workarounds are available in the form of best practices for situations where software upgrades are not currently feasible.
Cisco has made software available, free of charge, to correct the problem.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20030717-blocked.

See Also

http://www.nessus.org/u?09cf3fb4

http://www.nessus.org/u?0cbca713

Plugin Details

Severity: High

ID: 48971

File Name: cisco-sa-20030717-blocked.nasl

Version: 1.18

Type: local

Family: CISCO

Published: 9/1/2010

Updated: 11/15/2018

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Available: true

Exploit Ease: No exploit is required

Patch Publication Date: 7/17/2003

Vulnerability Publication Date: 7/17/2003

Reference Information

CVE: CVE-2003-0567

BID: 8211