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Vulnerability Note VU#972686

HP-UX ICMP vulnerable to DoS via ICMP Path Maximum Transmission Unit (PMTU) Discovery

Overview

A vulnerability in HP-UX may allow a remote attacker to cause a denial of service by sending a specially crafted ICMP packet.

I. Description

A number of widely accepted Internet standards describe different aspects of the relationships between the Internet Control Message Protocol (ICMP) and Transmission Control Protocol (TCP). In particular, RFC 1122 explains how TCP should respond to ICMP messages. Path MTU Discovery (RFC1191) is a method used to discover the maximum transmission unit (MTU) of an arbitrary internet path by using ICMP messages.

HP-UX 11 contains an unspecified vulnerability in how it handles Path MTU Discovery messages. This may allow a remote attacker to cause a denial-of-service condition.

II. Impact

A remote unauthenticated attacker may be able to cause a denial of service by sending a specially crafted ICMP packet to any open TCP/IP connection. The denial of service can only be corrected by a reboot of the affected system.

III. Solution

Apply a patch


Apply a patch, as specified in HP Technical Document c00571568.

Set the PMTU Strategy

Until patches are available, the denial of service may be avoided by setting the ip_pmtu_strategy parameter to 0 or 3, as specified in the HP Security Bulletin.

Systems Affected

VendorStatusDate NotifiedDate Updated
Hewlett-Packard CompanyVulnerable26-Apr-2005

References


http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=c00571568
http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX01137
http://www.securitytracker.com/alerts/2005/Apr/1013798.html
http://secunia.com/advisories/15123/

Credit

Thanks to HP for reporting this vulnerability.

This document was written by Will Dormann.

Other Information

Date Public:2005-04-24
Date First Published:2007-04-12
Date Last Updated:2007-04-12
CERT Advisory: 
CVE-ID(s):CVE-2005-1192
NVD-ID(s):CVE-2005-1192
US-CERT Technical Alerts: 
Metric:4.05
Document Revision:10

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