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CVE-2019-5420

CRITICAL
9.8
CVSS Score
Published: March 27, 2019 at 01:48 PM UTC
Updated: June 17, 2026 at 02:37 AM UTC
4 products affected across 4 vendorsDebian LinuxFedoraRails

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Severity
CRITICAL9.8
Exploit prediction
EPSS 89%

Description

A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. This secret token can be used in combination with other Rails internals to escalate to a remote code execution exploit.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
8.0
Fedora· Fedora Projectrpm
95%
30
Rails· Rubyonrails
95%
v < 5.2.2.16.0.0 beta16.0.0 beta2
Affected range stops below 5.2.2.1, so it looks safe — our inference, not a vendor statement
Rails· Rails
60%
5.2.2.16.0.0.beta3

References (5)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.html
x_refsource_CONFIRM
Source: [email protected]
https://groups.google.com/forum/#%21topic/rubyonrails-security/IsQKvDqZdKw
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/
x_refsource_CONFIRMPatchVendor Advisory
Source: [email protected]
https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/
Exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.exploit-db.com/exploits/46785/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-77CWE-330

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