IPsec-Tools: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200705-09 / ipsec-tools
Release Date	May 08, 2007
Latest Revision	May 08, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-firewall/ipsec-tools	< 0.6.7	>= 0.6.7	All supported architectures

Related bugreports: #173219

Synopsis

IPsec-Tools contains a vulnerability that allows a remote attacker to crash the IPsec tunnel.

2. Impact Information

Background

IPsec-Tools is a port of KAME's implementation of the IPsec utilities. It contains a collection of network monitoring tools, including racoon, ping, and ping6.

Description

The isakmp_info_recv() function in src/racoon/isakmp_inf.c does not always check that DELETE (ISAKMP_NPTYPE_D) and NOTIFY (ISAKMP_NPTYPE_N) packets are encrypted.

Impact

A remote attacker could send a specially crafted IPsec message to one of the two peers during the beginning of phase 1, resulting in the termination of the IPsec exchange.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All IPsec-Tools users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/ipsec-tools-0.6.7"

4. References

CVE-2007-1841

Updated May 08, 2007

Summary: This is a Gentoo Linux Security Advisory

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