Denial of service in activestorage gem for Ruby



Published: 2020-05-26
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-8162
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		activestorage
Web applications / Modules and components for CMS

Vendor Ruby

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU28240

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-8162

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in ActiveStorage's S3 adapter. A remote attacker can control the Content-Length of an S3 direct upload URL without receiving a new signature from the server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

activestorage: 5.2.0 - 6.0.3 rc1

CPE2.3 External links

http://snyk.io/vuln/SNYK-RUBY-ACTIVESTORAGE-569602
http://github.com/rails/rails/commit/c0ab9a7d29b84a6ccb1ffa3e8ca1ce61f7a9fbb8
http://groups.google.com/forum/#!topic/rubyonrails-security/PjU3946mreQ
http://hackerone.com/reports/789579

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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