CVE-2020-8162: Malicious File Upload
First published: Fri Jun 19 2020(Updated: )
A client side enforcement of server side security vulnerability exists in rails < 5.2.4.2 and rails < 6.0.3.1 ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Rubyonrails Rails | <5.2.4.2 | |
| Rubyonrails Rails | >=6.0.0<6.0.3.1 | |
| Debian Debian Linux | =10.0 | |
| debian/rails | 2:5.2.2.1+dfsg-1+deb10u3 2:5.2.2.1+dfsg-1+deb10u5 2:6.0.3.7+dfsg-2+deb11u2 2:6.1.7.3+dfsg-1 2:6.1.7.3+dfsg-2 |
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Reference Links
- https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ
- https://hackerone.com/reports/789579
- https://www.debian.org/security/2020/dsa-4766
- https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released
- https://github.com/rails/rails/commit/e8df5648515a0e8324d3b3c4bdb7bde6802cd8be
- https://security-tracker.debian.org/tracker/CVE-2020-8162
Frequently Asked Questions
What is CVE-2020-8162?
CVE-2020-8162 is a client-side enforcement of server-side security vulnerability in Rails < 5.2.4.2 and Rails < 6.0.3.1 ActiveStorage's S3 adapter.
How does CVE-2020-8162 work?
CVE-2020-8162 allows an end user to modify the Content-Length of a direct file upload, bypassing upload limits.
What is the severity of CVE-2020-8162?
The severity of CVE-2020-8162 is not specified.
Which software versions are affected by CVE-2020-8162?
CVE-2020-8162 affects Rails < 5.2.4.2 and Rails < 6.0.3.1.
How can I fix CVE-2020-8162?
To fix CVE-2020-8162, you should update Rails to version 5.2.4.3 or 6.0.3.1 or later.
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