Vulnerability CVE-2017-0904
Published: 2017-11-13

Description:
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.

Type:

CWE-755

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Private address check project -> Private address check 

 References:
https://edoverflow.com/2017/ruby-resolv-bug/
https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46af
https://github.com/jtdowney/private_address_check/issues/1
https://hackerone.com/reports/287245
https://hackerone.com/reports/287835
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