CVE-2020-8162

Description

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.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
• v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 1.55%• Percentile: 82%

Techniques & Countermeasures

• CWE-434•Unrestricted Upload of File with Dangerous Type

  The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

• CWE-602•Client-Side Enforcement of Server-Side Security

  The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.

Affected Systems

• debian•debian_linux

  10.0

• rubyonrails•rails

  < 5.2.4.2 | ≥ 6.0.0, < 6.0.3.1

References (3)

• https://hackerone.com/reports/789579
• https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ
• https://www.debian.org/security/2020/dsa-4766