CVE-2022-30123: Rack Possible Shell Escape Sequence Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-wq4h-7r42-5hrr
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CVSS 10.0
CWE-150
Published
Advisory Summary

CVE-2022-30123 is a CRITICAL (CVSS 10.0) possible shell escape sequence injection vulnerability (CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences) affecting Rack libraries in the RubyGems ecosystem. The issue involves possible shell escape sequence injection vulnerability in rack. Remediation is available by upgrading affected packages to version 2.0.9.1, 2.1.4.1, 2.2.3.1.

CVE-2022-30123 at a Glance

CVE Identifier CVE-2022-30123
GHSA Identifier GHSA-wq4h-7r42-5hrr
Severity CRITICAL
CVSS v3.1 Base Score 10.0
CWE Classification CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences
Affected Product Rack
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 10.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2022-30123

To remediate this vulnerability, upgrade all affected Rack dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

rack fixed: 2.0.9.1 
Upgrade rack to 2.0.9.1
rack fixed: 2.1.4.1 
Upgrade rack to 2.1.4.1
rack fixed: 2.2.3.1 
Upgrade rack to 2.2.3.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for rack

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-30123, inspect your project dependencies for Rack:

inspect dependencies for rack

Analyze the terminal output to locate any version of Rack in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.9.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences, where the product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component. In Rack, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

There is a possible shell escape sequence injection vulnerability in the Lint and CommonLogger components of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-30123. Versions Affected: All. Not affected: None Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1 ## Impact Carefully crafted requests can cause shell escape sequences to be written to the terminal via Rack's Lint middleware and CommonLogger middleware. These escape sequences can be leveraged to possibly execute commands in the victim's terminal. Impacted applications will have either of these middleware installed, and vulnerable apps may have something like this: ``` use Rack::Lint ``` Or ``` use Rack::CommonLogger ``` All users running an affected release should either upgrade or use one of the workarounds immediately. ## Workarounds Remove these middleware from your application

CVE-2022-30123 Affected Rack Versions

3 component(s)
Fixed Versions:
2.0.9.12.1.4.12.2.3.1
Product / Package Ecosystem Affected Versions Fixed Version
rack
gem/rack
RubyGems
< 2.0.9.1
2.0.9.1
rack
gem/rack
RubyGems
≥ 2.1
< 2.1.4.1
2.1.4.1
rack
gem/rack
RubyGems
≥ 2.2
< 2.2.3.1
2.2.3.1

References

NVD — CVE-2022-30123 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-30123
Security Fix Commit FIX COMMIT
https://github.com/rack/rack/commit/b426cc224908ec6ed6eb8729325392b048215d88
discuss.rubyonrails.org/t/cve-2022-30123-po... WEB
https://discuss.rubyonrails.org/t/cve-2022-30123-possible-shell-escape-sequence-injection-vulnerability-in-rack/80728
Rack Source Repository REPOSITORY
https://github.com/rack/rack
Rack Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-30123.yml
Rack Security Information SECURITY
https://groups.google.com/g/ruby-security-ann/c/LWB10kWzag8
Rack Security Information SECURITY
https://security.gentoo.org/glsa/202310-18
Rack Security Information SECURITY
https://security.netapp.com/advisory/ntap-20231208-0011
Rack Security Information SECURITY
https://www.debian.org/security/2023/dsa-5530

Frequently Asked Questions

What is CVE-2022-30123?
CVE-2022-30123 is a security vulnerability in Rack involving Possible shell escape sequence injection vulnerability in Rack under CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences.
Which Rack versions are affected?
Affected versions include releases prior to 2.0.9.1, 2.1.4.1, 2.2.3.1 across affected packages: rack.
What version fixes CVE-2022-30123?
Upgrading to 2.0.9.1, 2.1.4.1, 2.2.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rack affected?
Yes, rack is affected in releases prior to 2.0.9.1, 2.1.4.1, 2.2.3.1. Upgrade your dependency to 2.0.9.1, 2.1.4.1, 2.2.3.1 or later.
What is the CVSS score of CVE-2022-30123?
CVE-2022-30123 has a CVSS v3.1 base score of 10.0 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2022-30123?
CVE-2022-30123 is classified under CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences (The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component.).
How can I check RubyGems dependencies for CVE-2022-30123?
Run the dependency tree command: 'inspect dependencies for rack'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wq4h-7r42-5hrr",
  "modified" : "2022-12-07T14:37:27Z",
  "published" : "2022-05-27T16:36:51Z",
  "aliases" : [ "CVE-2022-30123" ],
  "summary" : "Possible shell escape sequence injection vulnerability in Rack",
  "details" : "There is a possible shell escape sequence injection vulnerability in the Lint\nand CommonLogger components of Rack.  This vulnerability has been assigned the\nCVE identifier CVE-2022-30123.\n\nVersions Affected:  All.\nNot affected:       None\nFixed Versions:     2.0.9.1, 2.1.4.1, 2.2.3.1\n\n## Impact\nCarefully crafted requests can cause shell escape sequences to be written to\nthe terminal via Rack's Lint middleware and CommonLogger middleware.  These\nescape sequences can be leveraged to possibly execute commands in the victim's\nterminal.\n\nImpacted applications will have either of these middleware installed, and\nvulnerable apps may have something like this:\n\n```\nuse Rack::Lint\n```\n\nOr\n\n```\nuse Rack::CommonLogger\n```\n\nAll users running an affected release should either upgrade or use one of the\nworkarounds immediately.\n\n## Workarounds\nRemove these middleware from your application\n",
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  }, {
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    "url" : "https://github.com/rack/rack/commit/b426cc224908ec6ed6eb8729325392b048215d88"
  }, {
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    "url" : "https://discuss.rubyonrails.org/t/cve-2022-30123-possible-shell-escape-sequence-injection-vulnerability-in-rack/80728"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rack/rack"
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    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-30123.yml"
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    "type" : "WEB",
    "url" : "https://groups.google.com/g/ruby-security-ann/c/LWB10kWzag8"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202310-18"
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    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20231208-0011"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2023/dsa-5530"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-150" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-05-27T16:36:51Z",
    "nvd_published_at" : "2022-12-05T22:15:00Z"
  }
}