Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 98.5%; technical severity is CVSS 7.5.
There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accept headers can cause contents of arbitrary files on the target system's filesystem to be exposed.
Who should care
- Teams operating Debian Linux, Fedora, Leap +4 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Debian Linux, Fedora, Leap +4 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Google Security advisory
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Patch
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CWE
- CWE-22
- Affected versions
- Debian Debian Linux (Version 8.0); Fedoraproject Fedora (Version 30); Opensuse Leap (Version 15.0); Rails Ruby on Rails; Redhat Cloudforms (Version 4.7 | Version 4.6); Redhat Software Collections (Version 1.0); Rubyonrails Rails (Start Including 3.0.0, End Excluding 4.2.11.1 | Start Including 5.0.0, End Excluding 5.0.7.2 | Start Including 5.1.0, End Excluding 5.1.6.2 | Start Including 5.2.0, End Excluding 5.2.2.1)
- Fixed versions
- Rubyonrails Rails (Fixed from 4.2.11.1, 5.0.7.2, 5.1.6.2, 5.2.2.1)
- Published
- 27 March 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 98.5%
- Signal calculated at 82
External references
- Red Hat Third-party advisory RHSA-2019:0796
- Red Hat Third-party advisory RHSA-2019:1147
- Red Hat Third-party advisory RHSA-2019:1149
- Red Hat Third-party advisory RHSA-2019:1289
- Debian Third-party advisory Msg00042
- CISA Government advisory CVE-2019-5418
- Lists Opensuse Third-party advisory Msg00011
- Exploit information from packetstormsecurity.com
- Lists Fedoraproject Third-party advisory Y43636TH4D6T46IC6N2RQVJTRFJAAYGA
- Exploit information from www.exploit-db.com