PT-2018-16179 · Ruby · Private Address Check

Sajjad · Published 2018-06-13 · Updated 2019-10-09 · CVE-2018-3759

Positive Technologies (AI Summary)

CVSS v2.0

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions private address check ruby gem versions prior to 0.5.0

Description The issue is related to a time-of-check time-of-use (TOCTOU) race condition. This occurs because the address the socket uses is not checked. Specifically, DNS entries with a TTL of 0 can trigger a scenario where the initial resolution is a public address, but the subsequent resolution is a private address.

Recommendations For versions prior to 0.5.0, update to version 0.5.0 or later to resolve the issue. As a temporary workaround, consider restricting the use of DNS entries with a TTL of 0 to minimize the risk of exploitation.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2018-3759

GHSA-2XVJ-J3QH-X8C3

Affected Products

Private Address Check

References · 7

• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/private_address_check/CVE-2018-3759.yml · Exploit
• https://github.com/jtdowney/private_address_check/commit/4068228187db87fea7577f7020099399772bb147 · Patch
• https://osv.dev/vulnerability/CVE-2018-3759 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-3759 · Security Note
• https://osv.dev/vulnerability/GHSA-2xvj-j3qh-x8c3 · Vendor Advisory
• https://github.com/jtdowney/private_address_check · Note
• https://github.com/advisories/GHSA-2xvj-j3qh-x8c3 · Note