An anonymous reader writes: A security researcher using Shodan to probe Arris cable modems for vulnerabilities has found that 600,000 of the company's modems not only have a backdoor, but that the backdoor itself has an extra backdoor. Brazilian vulnerability tester Bernardo Rodrigues posted that he found undocumented libraries in three models, initially leading to a backdoor that uses an admin password disclosed back in 2009. Brazilian researcher Bernardo Rodrigues notes that the secondary backdoor has a password derived in part from the final five digits from the modem's serial number. However, the default 'root' password for the affected models remains 'arris.'
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