Buffer under-read vulnerability in Ruby's String#unpack method allows for massive information disclosure

CVE-2018-8778 · MEDIUM Severity

AV:N/AC:L/AU:N/C:P/I:N/A:N

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker controlling the unpacking format (similar to format string vulnerabilities) can trigger a buffer under-read in the String#unpack method, resulting in a massive and controlled information disclosure.

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