CVE-2020-36327

Public on

Last Modified: UTC

Important Important Impact What does this mean?
8.8 CVSS v3 Base Score

Description

A flaw was found in the way Bundler determined the source repository when installing dependencies of source-restricted gem packages. In configurations that use multiple gem repositories and explicitly define from which source repository certain gems are to be installed, a dependency of a source-restricted gem could be installed form a different source if that repository provided higher version of the package. This could lead to installation of a malicious gem version and arbitrary code execution.

Statement

Red Hat Satellite does not ship RubyGem bundler, however, the product consumes it from the Red Hat Software Collections (RHSCL) repository.

Mitigation

This issue only affects configurations where gem packages are installed from multiple sources and the source repositories are explicitly defined for at least some gems. Dependencies of those source-restricted gems may be installed form a different repository, even if the same repository provides those dependencies, which is inconsistent with the intended behaviour described in the Bundler documentation. There are multiple possible approaches to mitigate this issue - customers should evaluate which approaches are usable in their environments.

* Explicitly define source for all dependency gems in the Gemfile configuration. When a dependency of a source-restricted gem is also to be installed form the same source, list such dependency explicitly in the Gemfile along with the specific source.

* Avoid configurations with multiple source repositories. When using a private repository for non-public gems, use the same private repository to mirror any content required from any public gem repository, such as RubyGems.org. When preparing such mirror, ensure that no mirrored gems have names conflicting with names of the internal non-public gems.

* Reserve internal package names in public repositories. For any internal private gem, also reserve the name in any public gem repository used, such as RubyGems.org. This will prevent attackers from registering those names and providing their malicious gems with higher versions.

Additional information about affected configurations can be found in the following Red Hat Knowledgebase article:

https://access.redhat.com/articles/6206172

Additional Information

External References

Content from www.cve.org is not included.https://www.cve.org/CVERecord?id=CVE-2020-36327

Content from nvd.nist.gov is not included.https://nvd.nist.gov/vuln/detail/CVE-2020-36327

https://access.redhat.com/articles/6206172

Content from www.zofrex.com is not included.https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/

Affected Packages and Issued Red Hat Security Errata

Products / Services Components State Errata
CloudForms Management Engine 5 rubygem-bundler Will not fix
Logging Subsystem for Red Hat OpenShift ruby Affected
Red Hat 3scale API Management Platform 2 rubygem-bundler Fix deferred
Red Hat Enterprise Linux 7 rubygem-bundler Not affected
Red Hat Enterprise Linux 8 ruby:2.7 Fixed RHSA-2021:3020
Red Hat Enterprise Linux 8 ruby:2.6 Fixed RHSA-2022:0543
Red Hat Enterprise Linux 8 ruby:2.5 Fixed RHSA-2022:0545
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions ruby:2.5 Fixed RHSA-2022:0548
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions ruby:2.6 Fixed RHSA-2022:0581
Red Hat Enterprise Linux 8.2 Extended Update Support ruby:2.5 Fixed RHSA-2022:0547
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Common Vulnerability Scoring System (CVSS) Score Details

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 Authorities (CNA) source for its products and services (see Red Hat classifications ).

CVSS v3 Score Breakdown Red Hat NVD
CVSS v3 Base Score 8.8 8.8
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction Required Required
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High

CVSS v3 Vector

Red Hat CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

 For open source software shipped by multiple vendors, the CVSS base scores may vary for each vendor's version depending on the version they ship, how they ship it, the platform, and even how the software is compiled. This makes scoring of vulnerabilities difficult for third-party vulnerability databases such as NVD that only provide a single CVSS base score for each vulnerability. Red Hat scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?
  • "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
  • "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future.

What can I do if my product is listed as "Will not fix"?

 A "will not fix" status means that a fix for an affected product version is not planned or not possible due to complexity, which may create additional risk.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.

What can I do if my product is listed as "Fix deferred"?

 A deferred status means that a fix for an affected product version is not guaranteed due to higher-priority development work.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.
  • Red Hat Engineering focuses on addressing high-priority issues based on their complexity or limited lifecycle support. Therefore, lower-priority issues will not receive immediate fixes.

What is a mitigation?

 A mitigation is an action that can be taken to reduce the impact of a security vulnerability, without deploying any fixes.

I have a Red Hat product but it is not in the above list, is it affected?

 The listed products were found to include one or more of the components that this vulnerability affects. These products underwent a thorough evaluation to determine their affectedness by this vulnerability. Note that layered products (such as container-based offerings) that consume affected components from any of the products listed in this table may be affected and are not represented.

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

 In order to maintain code stability and compatibility, Red Hat usually does not rebase packages to entirely new versions. Instead, we backport fixes and new features to an older version of the package we distribute. This can result in some security scanners that only consider the package version to report the package as vulnerable. To avoid this, we suggest that you use an approved vulnerability scanner from our This content is not included.Red Hat Vulnerability Scanner Certification program.