CVE-2017-0904

The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby's Resolv.getaddresses method, which is OS-dependent and should not be relied upon for security measures, such as when used to blacklist private network addresses to prevent server-side request forgery.

• CWE-242
• CWE-755

• https://edoverflow.com/2017/ruby-resolv-bug/Issue Tracking, Third Party Advisory
• https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46afThird Party Advisory
• https://github.com/jtdowney/private_address_check/issues/1Issue Tracking, Third Party Advisory
• https://hackerone.com/reports/287245Issue Tracking, Mitigation, Patch, Third Party Advisory
• https://hackerone.com/reports/287835Permissions Required, Third Party Advisory
• https://edoverflow.com/2017/ruby-resolv-bug/Issue Tracking, Third Party Advisory
• https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46afThird Party Advisory
• https://github.com/jtdowney/private_address_check/issues/1Issue Tracking, Third Party Advisory
• https://hackerone.com/reports/287245Issue Tracking, Mitigation, Patch, Third Party Advisory
• https://hackerone.com/reports/287835Permissions Required, Third Party Advisory

Published

Nov 13, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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