CVE-2020-8165
Description
A flaw was found in rubygem-activesupport. An untrusted user input can be written to the cache store using the raw: true parameter which can lead to the result being evaluated as a marshaled object instead of plain text. The threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Statement
This issue affects the version of rubygem-activesupport as shipped with Red Hat Gluster Storage 3. However, the 'raw' option is not used by the product when storing untrusted user input and hence this issue has been rated as having a security impact of Low.
Red Hat Satellite ship affected RubyGem ActiveSupport and use RedisCacheStore, however, unmarshalling of user-provided objects is handled well in product code hence it is not vulnerable to the flaw. We may update the Ruby on Rails and rails-core dependency in a future release.
in OpenShift Container Platform 3.11, rubygem-activesupport is shipped, and it's included in the logging-fluentd container for use by rubygem-kubeclient [1]. The kubeclient gem does NOT make use of the vulnerable class, its only included for the inflector part of activesupport.
Mitigation
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.8 | 9.8 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
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