Vulnerability Note VU#552398

KAME Racoon IKE daemon fails to properly verify client RSA signatures

Overview

The KAME Racoon IKE daemon fails to properly verify client RSA signatures when using Main or Aggressive Mode during a Phase 1 IKE exchange.

I. Description

Racoon is an IKE Key Management daemon that negotiates and configures a set of parameters for IPSec. When authenticating a peer in Phase 1 of an IKE exchange, Racoon can use pre-shared keys, RSA signatures, or GSS-API. When using RSA signatures for authentication, Racoon validates the X.509 certificate, but fails to verify the client RSA signature.

II. Impact

An attacker with access to a trusted X.509 certificate can conduct a man-in-the-middle attack or establish an authenticated IPSec connection using any private key to generate the RSA signature.

III. Solution

Apply Patch

Apply a patch as specified by your vendor. If a patch is unavailable, KAME has released a patch that is available in their CVS repository at:

http://www.kame.net/dev/cvsweb2.cgi/kame/kame/kame/racoon/crypto_openssl.c.diff?r1=1.83&r2=1.84

Systems Affected

Vendor	Status	Date Notified	Date Updated
KAME Project	Vulnerable	9-Apr-2004

References

http://ipsec-tools.sourceforge.net/x509sig.html
http://www.kame.net/racoon/
http://www.kame.net/dev/cvsweb2.cgi/kame/kame/kame/racoon/crypto_openssl.c.diff?r1=1.83&r2=1.84
http://vuxml.freebsd.org/d8769838-8814-11d8-90d1-0020ed76ef5a.html
http://secunia.com/advisories/11328/
http://forums.gentoo.org/viewtopic.php?t=158550

Credit

This vulnerability was reported by Ralf Spenneberg.

This document was written by Damon Morda.

Other Information

Date Public:	2004-04-07
Date First Published:	2004-04-09
Date Last Updated:	2004-04-09
CERT Advisory:
CVE-ID(s):	CAN-2004-0155
NVD-ID(s):	CAN-2004-0155
US-CERT Technical Alerts:
Metric:	8.58
Document Revision:	25

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