CVE-2019-5420
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Ruby On Rails - DoubleTap Development Mode secret_key_base Remote Code Execution (Metasploit)
Metasploit modules
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2:5.2.2.1+dfsg-1 |
| sid | Fixed | 2:5.2.2.1+dfsg-1 |
| forky | Fixed | 2:5.2.2.1+dfsg-1 |
| bullseye | Fixed | 2:5.2.2.1+dfsg-1 |
| bookworm | Fixed | 2:5.2.2.1+dfsg-1 |
References
- https://groups.google.com/forum/#!topic/rubyonrails-security/IsQKvDqZdKw
- https://www.suse.com/security/cve/CVE-2019-5420.html
- https://nvd.nist.gov/vuln/detail/CVE-2019-5420
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/railties/CVE-2019-5420.yml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA
- https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released
- https://www.exploit-db.com/exploits/46785
- http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.html
- https://security-tracker.debian.org/tracker/CVE-2019-5420
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.