Security Leftovers
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Thursday's security updates
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MMD-0047-2015 - SSHV: SSH bruter ELF botnet malware w/hidden process kernel module
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Another “critical” “VPN” “vulnerability” and why Port Fail is bullshit
The morning of November 26 brought me interesting news: guys from Perfect Privacy disclosed the Port Fail vulnerability, which can lead to an IP address leak for clients of VPN services with a “port forwarding” feature. I was indignant about their use of the word “vulnerability”. It’s not a vulnerability, just a routing feature: Traffic to VPN server always goes via ISP, outside of VPN tunnel. Pretty obvious thing, I thought, which should be known by any network administrator. Besides that, the note is technically correct, so nothing to worry about. But then the headlines came, and shit hit the fan.
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Cracking Linux with the backspace key?
The source of these reports is a mildly hype-ridden disclosure of a vulnerability in the GRUB2 bootloader by Hector Marco and Ismael Ripoll. It seems that hitting the backspace character at the GRUB2 username prompt enough times will trigger an integer underflow, allowing a bypass of GRUB2's authentication stage. According to the authors, this vulnerability, exploitable for denial-of-service, information-disclosure, and code-execution attacks, "results in an incalculable number of affected devices." It is indeed a serious vulnerability in some settings and it needs to be fixed. Unfortunately, some of the most severely affected systems may also be the hardest to patch. But language like the above leads reporters to write that any Linux system can be broken into using the backspace key, which stretches the truth somewhat.
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