Re: Cisco 6509 switch telnet vulnerability

[Wendy Garvin <wgarvin@cisco.com>]

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Chris,

This is a known bug, and we were able to reproduce the behavior you 
reported, however the commands cannot actually be executed. As you 
demonstrated, you can get the 'help' text for non-enable commands at the
password prompt, but the command is not completed, all that is returned is
an error message. These commands are publicly available:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_5/cmd_refr/cli.htm

This bug cannot be used to gain control of the switch, gather further
information about the device or gather details about the traffic it carries.
It is documented as CSCdr87435, and it is fixed in 5.5(3) and later, and
6.1(1) and later. Details about the problem can be found on our website if
you are a registered user:

http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdr87435

Thank you for your work on this problem. As always, working with the Cisco 
PSIRT team is the best way to verify the accuracy of information before
posting it publicly.

- ---Wendy

> Chris Norton <kicktd@hotmail.com> [2003-10-03 16:24] wrote:
> 
> 
> A vulnerability has been found on Cisco 6509 switches. The vulnerability was 
> found to work on 2 different Cisco 6509 switches running CATOS 5.4(2) and 
> 5.5(2). The vulnerability can lead to information and commands being exectued 
> on the remote switch from the login prompt. Commands can be exectued at the 
> Enter password: prompt as long as they are followed by a space and a ?
> Proof of concept below:
> Cisco Systems Console
> 
> Enter password:
> <data_size>                Size of the packet (0..1420)
> <cr>                       
> Enter password: traceroute 127.0.0.1
> 
> This vulnerability has yet to be confirmed by Cisco but they have been 
> alerted about it.
> 
> [    ----- End of Included Message -----    ]

- --- 
Wendy Garvin - Cisco PSIRT - 408 525-1888 CCIE# 6526
- -----------------------------------------------------
           http://www.cisco.com/go/psirt

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