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| About site: http://www.schneier.com/pptp.html |
Title: Security/Virtual Private Networks/Protocols - PPTP Crack Counterpane Systems has exposed insecurities in Microsoft's Point to Point Tunneling Protocol.
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PPTP
Bruce Schneier
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Analysis of Microsoft PPTP Version 2
Counterpane Labs and L0pht Heavy Industries
The full paper can be found at http://www.schneier.com/paper-pptpv2.html. Details are below.
This page and the PPTPv2 paper are available in French translations by Fernandes Gilbert.
See also: Exploiting known security holes in Microsoft's PPTP Authentication Extensions (MS-CHAPv2) by Jochen Eisinger
In 1998, Bruce Schneier and Mudge released an analysis of Microsoft PPTP. We found serious flaws in the following areas:
password hashing -- weak algorithms allow eavesdroppers to learn the
user's password
Challenge/Reply Authentication Protocol -- a design flaw allows an
attacker to masquerade as the server
encryption -- implementation mistakes allow encrypted data to be recovered
encryption key -- common passwords yield breakable keys, even for 128-bit
encryption
control channel -- unauthenticated messages let attackers crash PPTP servers
Details of the 1998 analysis are in our press release and FAQ.
Since our analysis, Microsoft released an upgrade to the protocol. This
upgrade is available for Windows 95, Windows 98, and Windows NT as DUN 1.3.
Microsoft has made the following security upgrades to the protocol.
The weaker LAN Manager hash is no longer sent along with the stronger
Windows NT hash. This is to prevent automatic password crackers like
L0phtcrack (http://www.l0pht.com/l0phtcrack) from first breaking the weaker
LAN Manager hash and then using that information to break the stronger NT hash.
An authentication scheme for the server has been introduced. This is to
prevent malicious servers from masquerading as legitimate servers.
The change password packets from MS-CHAPv1 have been replaced by a single
change password packet in MS-CHAPv2. This is to prevent the active attack
of spoofing MS-CHAP failure packets.
MPPE uses unique keys in each direction. This is to prevent the trivial
cryptanalytic attack of XORing the text stream in each direction to remove
the effects of the encryption.
The software is more robust against denial-of-service attacks, and does
not leak as much information about its status.
These changes address most of the major security weaknesses of the orginal
protocol. However, the revised protocol is still vulnerable to offline
password-guessing attacks from hacker tools such as L0phtcrack. At this point we still do not recommend Microsoft PPTP for applications where security is a factor.
Press Coverage of PPTP Version 2 Crack:
SmartReseller
Press Coverage of PPTP Version 1 Crack:
EE Times
Wired.com
ZDNet
CNet News.com
Schneier.com is a personal website. Opinions expressed are not necessarily those of BT.
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Counterpane | Systems | has | exposed | insecurities | in | Microsoft's | Point | to | Point | Tunneling | Protocol. |
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