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From: nathan at (
Subject: 2004-08-03 SECURITY HOLE, fixed in PuTTY 0.55

By the way, I just happened to be downloading PuTTY today to set up on a new
computer, and I saw that they released a new version:

PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms,
along with an xterm terminal emulator. It is written and maintained primarily
by Simon Tatham.

2004-08-03 SECURITY HOLE, fixed in PuTTY 0.55

PuTTY 0.55, released today, fixes a serious security hole which may allow a
server to execute code of its choice on a PuTTY client connecting to it. In
SSH2, the attack can be performed before host key verification, meaning that
even if you trust the server you think you are connecting to, a different
machine could be impersonating it and could launch the attack before you
could tell the difference. We recommend everybody upgrade to 0.55 as soon as

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