Vulnerability Note VU#223273

Integer underflow vulnerability in isakmpd "Certificate Request Payload" handling

Overview

A vulnerability exists in the isakmpd that could allow a remote attacker to cause a denial of service.

I. Description

The OpenBSD isakmpd establishes security associations for encrypted and authenticated (IPsec) network traffic. It implements the Internet Security Association and Key Management Protocol (ISAKMP) and Internet Key Exchange (IKE) protocol. An integer underflow error exists in isakmpd's handling of certain "Certificate Request Payloads". An ISAKMP packet with a malformed Certificate Request Payload can trigger this error, resulting in failed allocation of a large amount of memory and subsequent crash of the isakmpd service.

II. Impact

A remote attacker could cause the isakmpd service to crash. Subsequent IPsec-enabled communications may be disrupted as a result.

III. Solution

Apply a patch from the vendor

Patches have been released to address this issue. Please see the Systems Affected section of this document for more details.

Systems Affected

Vendor	Status	Date Notified	Date Updated
OpenBSD	Vulnerable	20-Aug-2004

References

Credit

This vulnerability was discovered by Rapid7 using their Striker test suite.

This document was written by Chad R Dougherty based on information published in Rapid7 Advisory R7-0018.

Other Information

Date Public:	2004-03-19
Date First Published:	2004-08-27
Date Last Updated:	2004-08-27
CERT Advisory:
CVE-ID(s):	CAN-2004-0220
NVD-ID(s):	CAN-2004-0220
US-CERT Technical Alerts:
Metric:	1.69
Document Revision:	15

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