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Kernel.org servers infected with backdoors for two years from 2009
Ebury backdoors SSH servers in hosting providers, giving the malware extraordinary reach.
The unknown attackers behind the compromise infected at least four servers inside kernel.org, the Internet domain underpinning the sprawling Linux development and distribution network, the researchers from security firm ESET said. After obtaining the cryptographic hashes for 551 user accounts on the network, the attackers were able to convert half into plaintext passwords, likely through password-cracking techniques and the use of an advanced credential-stealing feature built into the malware. The malware, the firm said, came in the form of a malicious code library that, when installed, created a backdoor in OpenSSH that provided the attackers with a remote root shell on infected hosts with no valid password required.
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