The PDF information was disclosed to CERT after the vulnerabilities were leaked in March, Carpenter said.
Contacted by e-mail in March, hack4life denied any affiliation with CERT and said that the reports were "stolen in a recent computer intrusion."
"Fun and amusement" was the primary motivation for stealing and leaking the vulnerability reports. A secondary motivation cited in e-mail by hack4life was anger over CERT's perceived failure to publish vulnerability information in a timely manner.
At the time, CERT officials cast doubt on hack4life's assertion that the reports were hacked, saying that the information was most likely leaked by a member of one of the development teams CERT works with to evaluate vulnerabilities.
The latest incident reaffirms CERT's belief that the problem lies with its vendors rather than with its own systems, Carpenter said. While CERT does not yet know which vendor is responsible for the leak, the organization is confident that an insider threat or compromise at one of the companies it deals with is responsible for the leaks, he said.
CERT is communicating with vendors about the problem, but Carpenter would not comment on whether CERT is working with law enforcement to catch the person responsible for the leaks.
"I'm not going to get into those specifics at this point," he said.
CERT plans to consult with affected vendors and discuss how to proceed now that the information is public, he said.
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