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printers
A great way to get access to sensitive information in an environment is to log into printers that have default/weak creds and steal SMTP/SMB credentials. To find good interfaces for pwning, I like to run gowitness first and then look at the report output (gowitness report list). Below are some notes on default creds for popular printers. You'll often see the printer make/model in the Title column of the gowitness output.
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Canon
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iR-ADV C5540
Default username:
administrator
password:
7654321
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HP
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CP4525
Unconfirmed but I believe this one needs a unique PIN.
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M402dne
Not sure about cred to login, but it's pretty boring from a sensitive data standpoint - I don't see a place to hijack SMTP/SMB creds.
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M402DW
M402dw default username is admin, and the default password is a unique 8-digit PIN found on a sticker inside the printer near the toner cartridge.
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M425dn
Default username of admin and password is shown on the printer config page.
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M479fdn (HP Color LaserJet Pro MFP M479fdn)
The default admin password for the HP Color LaserJet Pro MFP M479fdn is likely the printer's default PIN, found on a sticker inside the front door or on the back of the printer. If that doesn't work, common defaults to try are admin or leaving the password field blank for the username admin.
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M551
Not sure about cred to login, but it's pretty boring from a sensitive data standpoint - I don't see a place to hijack SMTP/SMB creds.