GHSA-2p68-f74v-9wc6

Suggest an improvement
Source
https://github.com/advisories/GHSA-2p68-f74v-9wc6
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/05/GHSA-2p68-f74v-9wc6/GHSA-2p68-f74v-9wc6.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-2p68-f74v-9wc6
Aliases
Published
2020-05-26T14:49:24Z
Modified
2024-02-15T05:33:23.635899Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
ActiveSupport potentially unintended unmarshalling of user-provided objects in MemCacheStore and RedisCacheStore
Details

In ActiveSupport, 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 reading and writing, especially in the case of the RedisCacheStore which does not, prior to these changes, detect if data was serialized using the raw option upon deserialization.

Workarounds

It is recommended that application developers apply the suggested patch or upgrade to the latest release as soon as possible. If this is not possible, we recommend ensuring that all user-provided strings cached using the raw argument should be double-checked to ensure that they conform to the expected format.

References

Affected packages

RubyGems / activesupport

Package

Name
activesupport
Purl
pkg:gem/activesupport

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.0.0
Fixed
5.2.4.3

Affected versions

5.*

5.0.0
5.0.0.1
5.0.1.rc1
5.0.1.rc2
5.0.1
5.0.2.rc1
5.0.2
5.0.3
5.0.4.rc1
5.0.4
5.0.5.rc1
5.0.5.rc2
5.0.5
5.0.6.rc1
5.0.6
5.0.7
5.0.7.1
5.0.7.2
5.1.0.beta1
5.1.0.rc1
5.1.0.rc2
5.1.0
5.1.1
5.1.2.rc1
5.1.2
5.1.3.rc1
5.1.3.rc2
5.1.3.rc3
5.1.3
5.1.4.rc1
5.1.4
5.1.5.rc1
5.1.5
5.1.6
5.1.6.1
5.1.6.2
5.1.7.rc1
5.1.7
5.2.0.beta1
5.2.0.beta2
5.2.0.rc1
5.2.0.rc2
5.2.0
5.2.1.rc1
5.2.1
5.2.1.1
5.2.2.rc1
5.2.2
5.2.2.1
5.2.3.rc1
5.2.3
5.2.4.rc1
5.2.4
5.2.4.1
5.2.4.2

Database specific

{
    "last_known_affected_version_range": "<= 5.2.4.2"
}

RubyGems / activesupport

Package

Name
activesupport
Purl
pkg:gem/activesupport

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.0.0
Fixed
6.0.3.1

Affected versions

6.*

6.0.0
6.0.1.rc1
6.0.1
6.0.2.rc1
6.0.2.rc2
6.0.2
6.0.2.1
6.0.2.2
6.0.3.rc1
6.0.3

Database specific

{
    "last_known_affected_version_range": "<= 6.0.3"
}