Time-of-Check Time-of-Use (TOCTOU) Race Condition in private_address_check Ruby Gem

CVE-2018-3759 · MEDIUM Severity

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

private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.

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