CVE-2023-38037 — ActiveSupport::EncryptedFile writes contents that will be encrypted to a tempora

ActiveSupport::EncryptedFile writes contents that will be encrypted to a temporary file. The temporary file's permissions are defaulted to the user's current `umask` settings, meaning that it's possible for other users on the same system to read the contents of the

01What is this vulnerability?

ActiveSupport::EncryptedFile writes contents that will be encrypted to a temporary file. The temporary file's permissions are defaulted to the user's current `umask` settings, meaning that it's possible for other users on the same system to read the contents of the temporary file.

02Affected products

Vendor	Product	Versions
Rails	ActiveSupport	>= 5.2.0, 5.2.0, 7.0.7.1, 6.1.7.5

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-01-09T00:33:47.704Z
• Last modified: 2025-02-15T00:10:27.790Z

09References

• discuss.rubyonrails.org — https://discuss.rubyonrails.org/t/cve-2023-38037-possible-file-disclosure-of-loc…