GLSA 200408-04: PuTTY: Pre-authentication arbitrary code execution

http://security.gentoo.org/

Severity:	normal
Title:	PuTTY: Pre-authentication arbitrary code execution
Date:	08/05/2004
Bugs:	#59383
ID:	200408-04

Synopsis

PuTTY contains a vulnerability allowing a SSH server to execute arbitrary code on the connecting client.

Background

PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/putty	<= 0.54	>= 0.55	All supported architectures

Description

PuTTY contains a vulnerability allowing a malicious server to execute arbitrary code on the connecting client before host key verification.

Impact

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.

Workaround

There is no known workaround at this time. All users are encouraged to upgrade to the latest available version of PuTTY.

Resolution

All PuTTY users should upgrade to the latest version:

    # emerge sync
    
    # emerge -pv ">=net-misc/putty-0.55"
    # emerge ">=net-misc/putty-0.55"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200408-04.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.