[c-nsp] cisco 828 "WARNING: Cookie information is corrupt"

Mon May 12 07:34:22 EDT 2008

Oh yes, those corrupted cookies!
You're lucky today, I've found the way to fix a corrupted cookie just by googleing, but sometimes what you find may look hard to understand, so I can make it simplier for you, I've wrote a vbs script that can be used from within a SecureCRT to recover that corrupted cookie ,just copy/paste this text below, save it as whatever.vbs , you need to first connect to the router with console, reach the rommon> and only then run this script.
When the script finishes, just type "reset" at the router's command prompt. Et voila! If you want a plain text list of the commands you need to enter, one by one, just scroll down after the script.

==== CUT BELOW HERE =====

#$language = "VBScript"
#$interface = "1.0"

Sub Main()
crt.Screen.Synchronous = True
Dim nAnswer

szMessage = vbTab & "Please be sure to run this script " & vbcr & _
            vbTab & "ONLY after you've got into rommon> " & vbcr & _
            vbTab & "prompt and ONLY on a router " & vbcr & _
            vbTab & "with a missing or corrupted cookie ! ! ! " & vbcr & _
            vbTab & "Are you sure you want to continue? "
nAnswer = MsgBox(szMessage, vbYesNo, "Run Commands Prompt")

If nAnswer = vbYes Then
    Crt.Screen.Send "priv" & vbcr
    Crt.Screen.WaitForString "assword:"
    Crt.Screen.Send "0000" & vbcr
    Crt.Screen.WaitForString ">"
    Crt.Screen.Send "cookie" & vbcr
    Crt.Screen.WaitForString "ersion:"
    Crt.Screen.Send "01" & vbcr
    Crt.Screen.WaitForString "0x01):"
    Crt.Screen.Send "01" & vbcr
    Crt.Screen.WaitForString "ddress:"
    Crt.Screen.Send "00 04 27 fe 00 ea" & vbcr
    Crt.Screen.WaitForString "0x3e):"
    Crt.Screen.Send "3e" & vbcr
    Crt.Screen.WaitForString "0x00):"
    Crt.Screen.Send "00" & vbcr
    Crt.Screen.WaitForString "0x01):"
    Crt.Screen.Send "01" & vbcr
    Crt.Screen.WaitForString "nused:"
    Crt.Screen.Send "ff" & vbcr
    Crt.Screen.WaitForString "ID:"
    Crt.Screen.Send "01 ff" & vbcr
    Crt.Screen.WaitForString "llocated:"
    Crt.Screen.Send "00 00" & vbcr
    Crt.Screen.WaitForString "0x17:"
    Crt.Screen.Send "00 00 00 00 00 00 00 00" & vbcr
    Crt.Screen.WaitForString "0x22:"
    Crt.Screen.Send "4a 41 44 05 42 30 39 ff ff 03 01" & vbcr
    Crt.Screen.WaitForString "eviation:"
    Crt.Screen.Send "6f e6" & vbcr
    Crt.Screen.WaitForString "0x2c:"
    Crt.Screen.Send "00 00 00 00 ff ff ff 50" & vbcr
    Crt.Screen.WaitForString "onfig:"
    Crt.Screen.Send "04" & vbcr
    Crt.Screen.WaitForString "0x31:"
    Crt.Screen.Send "49 11 ec 03" & vbcr
    Crt.Screen.WaitForString "ddress:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x3f:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x47:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x4f:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x57:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x5f:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x67:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x6f:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x77:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    Crt.Screen.WaitForString "0x7f:"
    Crt.Screen.Send "ff ff ff ff ff ff ff ff" & vbcr
    MsgBox "The script has finished", vbOKOnly
Else
    MsgBox "The script was cancelled", vbOKOnly
    exit Sub
End If
crt.Screen.Synchronous = False
End Sub

==== END CUT =====

Here's the plain text lsit of commands:

rommon 1>cookie

! If all 0 then:

rommon 2>priv
Password:0000

rommon 3>cookie

And then answer each question with these lines, one by one respectively:

 01
 01
 00 04 27 fd 7c 0c
 3e
 00
 01
 ff
 01 ff
 00 00
 00 00 00 00 00 00 00 00
 4a 41 44 05 31 30 35 4e 310801
 00 00
 00 00 00 00 ff ff ff 50
 06
 49 11 ec 06
 ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff
 ff ff ff ff ff ff ff ff

rommon 4>reset

Hope this helps!

Ziv

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Emre T?rkmenler
Sent: Monday, May 12, 2008 1:37 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] cisco 828 "WARNING: Cookie information is corrupt"

Hi,

I have a Cisco 828 Router and I'm receiving a "WARNING: Cookie information is corrupt" message and the router can't boot,I can only reach the Rommon mode.

How can I solve this problem?

Thanks
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