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6.5 million password hashes suggest a possible breach at LinkedIn

LinkedIn is believed to have suffered a password hash breach (updated: LinkedIn has confirmed the breach), thanks to a forum post that quickly caught the attention of security researchers on Twitter and other social outlets. The posted archive contained a 270+ MB text file of SHA-1 hashes, and forum discussions suggested that it was related to the popular business-centric social site.

At the moment, little is known and speculation is running wild. LinkedIn has not finished investigating whether they have been breached, however many security pros are confirming for the media that the SHA-1 hashes of their passwords are found in the file. The file is constructed in a hash-per-line fashion, with no evident plaintext that suggests it is anything other than passwords (such as usernames, etc.). However, it’s possible that anyone gaining the original access to hashes had or has access to additional details.

I obtained a copy of the hash list, produced a SHA-1 hash of my old LinkedIn password, and did indeed find it in the list. I have also spot-checked several other hashes posted by security pros on Twitter, and have found them as well. Given the nature of my own password (16 random characters comprised of A-Z, a-z, and 0-9) the likelihood that my SHA-1 hash of my password (that was unique to LinkedIn) would be present in a file that did NOT come (at least in part) from a source that had access to hashes of LinkedIn passwords is statistically impossible.

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CSIRT Monitoring for Cisco House at the London 2012 Olympic Games

As part of CSIRT’s mobile monitoring offering for special events, we undertook monitoring of the corporate and customer traffic of the Cisco House at the London 2012 Olympics. This engagement presents us with an excellent opportunity to showcase Cisco technology, while keeping a close watch on potential network security threats. CSIRT monitoring for this event will be active for the entire life-span of the Cisco House, from two months before the Olympics, until two months after.

For the London 2012 engagement, we shipped our gear in a 14RU military-grade rack that is containerized: made for shipping. Inside the mobile monitoring rack we have an assortment of Cisco kit and third-party kit that mirrors the monitoring we do internally:

  • Catalyst 3750 to fan out traffic to all the other devices
  • FireEye for advanced malware detection
  • Two Cisco IronPort WSA devices for web traffic filtering based on reputation
  • Cisco UCS box where we run multiple VMs
  • Lancope StealthWatch collector for NetFlow data
  • and a Cisco 4255 IDS for intrusion detection

We mirror the signatures that we have deployed internally at Cisco out to these remote locations. Depending on the environment where the mobile monitoring rack is deployed, we may also do some custom tuning. The kit in the mobile monitoring rack can do intrusion detection, advanced malware detection, and collect and parse NetFlow and log data for investigation purposes. The Cisco UCS rack server also helps us have several VMs,  allowing us to run multiple tools that complement the other devices in the rack. For example, we run a Splunk instance on a VM to collect the logs generated by all the services. The data from the gear in the mobile monitoring rack is analyzed by our team of analysts and investigators, to eliminate false positives, conduct mitigation and remediation, and finally produce an incident report if required.

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