PuTTY: Pre-authentication arbitrary code execution
Gentoo Linux Security Advisory
||GLSA 200408-04 / PuTTY
||August 05, 2004
||May 22, 2006: 03
All supported architectures
PuTTY contains a vulnerability allowing a SSH server to execute arbitrary
code on the connecting client.
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix
platforms, along with an xterm terminal emulator.
PuTTY contains a vulnerability allowing a malicious server to execute
arbitrary code on the connecting client before host key verification.
When connecting to a server using the SSH2 protocol an attacker is able
to execute arbitrary code with the permissions of the user running
PuTTY by sending specially crafted packets to the client during the
authentication process but before host key verification.
There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version of PuTTY.
All PuTTY users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=net-misc/putty-0.55"
# emerge ">=net-misc/putty-0.55"