Security readout for executives and security teams
Plain-English summary
This affects Ruby applications that used private_address_check before 0.4.0 to block access to private network addresses. The check could be bypassed because it relied on OS-dependent DNS resolution behavior. Business impact depends on where the gem protected outbound URL fetching or SSRF controls.
Executive priority
Prioritize if Ruby services use this gem as an SSRF barrier around sensitive internal systems. Without that usage, urgency is lower, but dependency cleanup should still be scheduled.
Technical view
private_address_check before 0.4.0 used Ruby Resolv.getaddresses for a security decision. The CVE states that method is OS-dependent and should not be relied on to blacklist private network addresses, creating a bypass risk for SSRF prevention logic.
Likely exposure
Exposure is likely limited to Ruby applications with private_address_check versions before 0.4.0, especially where the gem guards user-controlled URL fetching, webhook handling, proxying, or similar outbound request paths.
Exploitation context
The provided sources describe a bypass and public vulnerability reports. The bundle does not identify CISA KEV listing, active exploitation, CVSS scoring, or broad in-the-wild abuse.
Researcher notes
Key issue is unsafe reliance on Resolv.getaddresses for security-sensitive private address decisions. Treat this as a control-bypass finding, not a standalone remote code execution issue. Source evidence does not establish exploit prevalence or severity score.
Mitigation direction
- Upgrade private_address_check to version 0.4.0 or later.
- Review Gemfile.lock and deployed artifacts for vulnerable versions.
- Check upstream project guidance and the referenced fixing commit.
- Add network egress controls around sensitive internal services.
- Review SSRF protections that depend on DNS blacklisting.
Validation and detection
- Confirm no deployed Gemfile.lock references private_address_check below 0.4.0.
- Identify code paths that validate user-supplied URLs before outbound requests.
- Perform approved staging tests confirming private address requests are blocked.
- Verify production builds contain the updated dependency.
- Review logs for unusual outbound requests to internal address ranges.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-242: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2017-0904 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://hackerone.com/reports/287245CVE reference · x_refsource_MISC
- https://edoverflow.com/2017/ruby-resolv-bug/CVE reference · x_refsource_MISC
- https://github.com/jtdowney/private_address_check/issues/1CVE reference · x_refsource_CONFIRM
- https://hackerone.com/reports/287835CVE reference · x_refsource_MISC
- https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46afCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of Inherently Dangerous Function
Use of Inherently Dangerous Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.