Bug: MD5 Considered Harmful Today: Creating a rogue CA certificate ( Ascii Version )

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MD5 Considered Harmful Today: Creating a rogue CA certificate

Published
Credit
Risk
2009.01.07
Alexander Sotirov
Medium
CWE
CVE
Local
Remote
CWE-310
CVE-2004-2761
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None

Our research team, consisting of 7 researchers from the United States,
Switzerland and the Netherlands, was able to execute a practical MD5 collision
attack and create a rogue Certification Authority trusted by all common web
browsers. This allows us to perform transparent man-in-the-middle attacks
against SSL connections and monitor or tamper with the traffic to secure
websites or email servers.

The infrastructure of Certification Authorities is meant to prevent exactly
this type of attack. Our work shows that known weaknesses in the MD5 hash
function can be exploited in realistic attack, due to the fact that even after
years of warnings about the lack of security of MD5, some root CAs are still
using this broken hash function.

More details:
http://www.phreedom.org/research/rogue-ca/

Enjoy!

Alex
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Darwin)

iEYEARECAAYFAklaUXEACgkQ6MVeVwnnQQStoQCdF5eIxqKx515soMee2sVgEACc
N7AAn1gOtnDC5f1tqB/RxMpfZ1rY+wnU
=Fpsd
-----END PGP SIGNATURE-----

References:

https://blogs.verisign.com/ssl-blog/2008/12/on_md5_vulnerabilities_and_mit.php
http://www.win.tue.nl/hashclash/SoftIntCodeSign/
http://www.win.tue.nl/hashclash/rogue-ca/
http://www.securityfocus.com/bid/33065
http://www.securityfocus.com/archive/1/archive/1/499685/100/0/threaded
http://www.phreedom.org/research/rogue-ca/
http://www.microsoft.com/technet/security/advisory/961509.mspx
http://www.doxpara.com/research/md5/md5_someday.pdf
http://blogs.technet.com/swi/archive/2008/12/30/information-regarding-md5-collisions-problem.aspx
http://blog.mozilla.com/security/2008/12/30/md5-weaknesses-could-lead-to-certificate-forgery/

See this note in TXT Version

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Ascii Version