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.

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.

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.

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

Vendor Information

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Updated: April 09, 2004

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please refer to the KAME CVS entry for “crypto_openssl.c”.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

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

Acknowledgements

This vulnerability was reported by Ralf Spenneberg.

This document was written by Damon Morda.

Other Information

CVE IDs:	CVE-2004-0155
Severity Metric:	8.58 Date Public: