Vulnerability disclosure presents a complex challenge to the information security community. A reductionist explanation of disclosure arguments need only present two claims. One end of the spectrum goes, “Only the vendor need know so no one else knows the problem exists, which means no one can exploit it.” The information-wants-to-be-free diametric opposition simply states, “Tell everyone as soon as the vulnerability is discovered”.
The Factor of Ultimate Doom (FUD) is a step towards reconciling this spectrum into a laser-focused compromise of agreement. It establishes a metric for evaluating the absolute danger inherent to a vulnerability, thus providing the discoverer with guidance on how to reveal the vulnerability.
The Factor is calculated by simple addition across three axes: Resources Expected, Protocol Affected, and Overall Impact. Vulnerabilities that do not meet any of the Factor’s criteria may be classified under the Statistically Irrelevant Concern metric, which will be explored at a later date.
(2) Exploit shellcode requires fewer than 12 bytes. In other words, it must be more efficient than the export PS1=# hack (to which many operating systems, including OS X, remain vulnerable)
(1) Exploit shellcode requires a GROSS sled. (A GROSS sled uses opcode 144 on Intel x86 processors, whereas the more well-known NOP sled uses opcode 0x90.)
(3) The Common Porn Interchange Protocol (TCP/IP)
(2) Multiple online rhetorical opinion networks
(1) Social networks
(3) Control every computer on the planet
(2) Destroy every computer on the planet
(1) Destroy another planet (obviously, the Earth’s internet would not be affected — making this a minor concern)
The resulting value is measured against an Audience Rating to determine how the vulnerability should be disclosed. This provides a methodology for verifying that a vulnerability was responsibly disclosed.
Audience Rating (by Factor of Ultimate Doom*)
(> 6) Can only be revealed at a security conference
(< 6) Cannot be revealed at a security conference
(< 0) Doesn’t have to be revealed; it’s just that dangerous
(*Due to undisclosed software patent litigation, values equal to 6 are ignored.)