CVE-2018-3759

Description

The 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.

Affected packages (1)

• RubyGems/private_address_checkfrom 0, < 0.5.0

References (5)

• ADVISORYhttps://github.com/advisories/GHSA-2xvj-j3qh-x8c3
• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2018-3759
• PATCHhttps://github.com/jtdowney/private_address_check
• WEBhttps://github.com/jtdowney/private_address_check/commit/4068228187db87fea7577f7020099399772bb147
• WEBhttps://github.com/rubysec/ruby-advisory-db/blob/master/gems/private_address_check/CVE-2018-3759.yml