| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 200512-04 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
http://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol |
| 9 |
implementation |
| 10 |
Date: December 12, 2005 |
| 11 |
Bugs: #112568, #113201 |
| 12 |
ID: 200512-04 |
| 13 |
|
| 14 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 15 |
|
| 16 |
Synopsis |
| 17 |
======== |
| 18 |
|
| 19 |
Openswan and IPsec-Tools suffer from an implementation flaw which may |
| 20 |
allow a Denial of Service attack. |
| 21 |
|
| 22 |
Background |
| 23 |
========== |
| 24 |
|
| 25 |
Openswan is an implementation of IPsec for Linux. IPsec-Tools is a port |
| 26 |
of KAME's implementation of the IPsec utilities, including racoon, an |
| 27 |
Internet Key Exchange daemon. Internet Key Exchange version 1 (IKEv1), |
| 28 |
a derivate of ISAKMP, is an important part of IPsec. IPsec is widely |
| 29 |
used to secure exchange of packets at the IP layer and mostly used to |
| 30 |
implement Virtual Private Networks (VPNs). |
| 31 |
|
| 32 |
Affected packages |
| 33 |
================= |
| 34 |
|
| 35 |
------------------------------------------------------------------- |
| 36 |
Package / Vulnerable / Unaffected |
| 37 |
------------------------------------------------------------------- |
| 38 |
1 net-misc/openswan < 2.4.4 >= 2.4.4 |
| 39 |
2 net-firewall/ipsec-tools < 0.6.3 >= 0.6.3 |
| 40 |
*>= 0.6.2-r1 |
| 41 |
*>= 0.4-r2 |
| 42 |
------------------------------------------------------------------- |
| 43 |
2 affected packages on all of their supported architectures. |
| 44 |
------------------------------------------------------------------- |
| 45 |
|
| 46 |
Description |
| 47 |
=========== |
| 48 |
|
| 49 |
The Oulu University Secure Programming Group (OUSPG) discovered that |
| 50 |
various ISAKMP implementations, including Openswan and racoon (included |
| 51 |
in the IPsec-Tools package), behave in an anomalous way when they |
| 52 |
receive and handle ISAKMP Phase 1 packets with invalid or abnormal |
| 53 |
contents. |
| 54 |
|
| 55 |
Impact |
| 56 |
====== |
| 57 |
|
| 58 |
A remote attacker can create a specially crafted packet using 3DES with |
| 59 |
an invalid key length, resulting in a Denial of Service attack, format |
| 60 |
string vulnerabilities or buffer overflows. |
| 61 |
|
| 62 |
Workaround |
| 63 |
========== |
| 64 |
|
| 65 |
Avoid using "aggressive mode" in ISAKMP Phase 1, which exchanges |
| 66 |
information between the sides before there is a secure channel. |
| 67 |
|
| 68 |
Resolution |
| 69 |
========== |
| 70 |
|
| 71 |
All Openswan users should upgrade to the latest version: |
| 72 |
|
| 73 |
# emerge --sync |
| 74 |
# emerge --ask --oneshot --verbose ">=net-misc/openswan-2.4.4" |
| 75 |
|
| 76 |
All IPsec-Tools users should upgrade to the latest version: |
| 77 |
|
| 78 |
# emerge --sync |
| 79 |
# emerge --ask --oneshot --verbose net-firewall/ipsec-tools |
| 80 |
|
| 81 |
References |
| 82 |
========== |
| 83 |
|
| 84 |
[ 1 ] CVE-2005-3671 |
| 85 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3671 |
| 86 |
[ 2 ] CVE-2005-3732 |
| 87 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3732 |
| 88 |
[ 3 ] Original Advisory |
| 89 |
http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/ |
| 90 |
|
| 91 |
Availability |
| 92 |
============ |
| 93 |
|
| 94 |
This GLSA and any updates to it are available for viewing at |
| 95 |
the Gentoo Security Website: |
| 96 |
|
| 97 |
http://security.gentoo.org/glsa/glsa-200512-04.xml |
| 98 |
|
| 99 |
Concerns? |
| 100 |
========= |
| 101 |
|
| 102 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 103 |
confidentiality and security of our users machines is of utmost |
| 104 |
importance to us. Any security concerns should be addressed to |
| 105 |
security@g.o or alternatively, you may file a bug at |
| 106 |
http://bugs.gentoo.org. |
| 107 |
|
| 108 |
License |
| 109 |
======= |
| 110 |
|
| 111 |
Copyright 2005 Gentoo Foundation, Inc; referenced text |
| 112 |
belongs to its owner(s). |
| 113 |
|
| 114 |
The contents of this document are licensed under the |
| 115 |
Creative Commons - Attribution / Share Alike license. |
| 116 |
|
| 117 |
http://creativecommons.org/licenses/by-sa/2.0 |
Archives