Potentially unintended unmarshalling of user-provided objects in MemCacheStore and RedisCacheStore
There is potentially unexpected behaviour in the MemCacheStore and RedisCacheStore where, when
untrusted user input is written to the cache store using the raw: true parameter, re-reading the result
from the cache can evaluate the user input as a Marshalled object instead of plain text. Vulnerable code looks like:
data = cache.fetch("demo", raw: true) { untrusted_string }
Versions Affected: rails < 5.2.5, rails < 6.0.4
Not affected: Applications not using MemCacheStore or RedisCacheStore. Applications that do not use the raw option when storing untrusted user input.
Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1
Impact
Unmarshalling of untrusted user input can have impact up to and including RCE. At a minimum,
this vulnerability allows an attacker to inject untrusted Ruby objects into a web application.
In addition to upgrading to the latest versions of Rails, developers should ensure that whenever
they are calling Rails.cache.fetch they are using consistent values of the raw parameter for both
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Bumps activesupport from 4.2.10 to 6.0.3.3. This update includes a security fix.
Vulnerabilities fixed
Sourced from The Ruby Advisory Database.
Release notes
Sourced from activesupport's releases.
Changelog
Sourced from activesupport's changelog.
Commits
070d4af
v6.0.3.3fbe2433
Preparing for 6.0.3.2 release34991a6
Preparing for 6.0.3.1 release2c8fe2a
bumping version, updating changelog0ad524a
update changelogbd39a13
activesupport: Deprecate Marshal.load on raw cache read in RedisCacheStore0a7ce52
activesupport: Avoid Marshal.load on raw cache value in MemCacheStoreb738f19
Preparing for 6.0.3 release509b9da
Preparing for 6.0.3.rc1 release02d07cc
adds missing require [Fixes #39042]Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
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