An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in…
Priority LOW 26CWE-732Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.
Why it matters now
EPSS 0.01179 67th percentileScored 2026-11-07
Fix Partial passenger (RubyGems): 5.3.2Red Hat: 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | passenger (RubyGems) | before 5.3.2 | 5.3.2 | Patch available | GHSA-4284-jfhc-f854 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- passenger (RubyGems) Vendor— Affected before 5.3.2 Fixed in 5.3.2 Patch available GHSA-4284-jfhc-f854
Remediation
- Fix · GHSA-4284-jfhc-f854 passenger (RubyGems) Fixed in 5.3.2 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 1.3 | Affected | No fix planned: Will not fix |
Not affected: 2 products
- Red Hat Satellite 6
- Red Hat Update Infrastructure 3 for Cloud Providers
Timeline
- 2026-10-02 Threatist record created from CVE-2018-12615
- 2026-10-03 Alias added: GHSA-4284-jfhc-f854
References
More Phusion Passenger vulnerabilities
- TI-2018-08619 During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion… CVSS 3.0CRITICAL 9.8
- TI-2025-19710 Use of uninitialized resource in Phusion Passenger CVSS 3.1HIGH 7.5
- TI-2018-08620 An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before… CVSS 3.0HIGH 8.8
- TI-2012-05097 RubyGems passenger 4.0.0 betas 1 and 2 allows remote attackers to delete arbitrary files during the startup process. CVSS 3.1HIGH 7.5
- TI-2018-08621 An Incorrect Access Control vulnerability in SpawningKit in Phusion Passenger 5.3.x… CVSS 3.0HIGH 7.8
- TI-2016-08407 In Phusion Passenger before 5.1.0, a known /tmp filename was used during… CVSS 3.0HIGH 7.8
Sources
- CVE-2018-12615 · CVE Program
- CVE-2018-12615 · NVD
- FIRST EPSS
- GHSA-4284-jfhc-f854 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-12615 · Red Hat security data · CC BY 4.0
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