CVE-2018-1000088: Doorkeeper Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-hwhh-2fwm-cfgw
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2018-1000088 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Doorkeeper libraries in the RubyGems ecosystem. The issue involves doorkeeper is vulnerable to stored xss and code execution. Remediation is available by upgrading affected packages to version 4.2.6.

CVE-2018-1000088 at a Glance

CVE Identifier CVE-2018-1000088
GHSA Identifier GHSA-hwhh-2fwm-cfgw
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Doorkeeper
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2018-1000088

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

doorkeeper fixed: 4.2.6 
Upgrade doorkeeper to 4.2.6
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 doorkeeper

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1000088, inspect your project dependencies for Doorkeeper:

inspect dependencies for doorkeeper

Analyze the terminal output to locate any version of Doorkeeper in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.2.6), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Doorkeeper, 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

Doorkeeper version 2.1.0 through 4.2.5 contains a Cross Site Scripting (XSS) vulnerability in web view's OAuth app form, user authorization prompt web view that can result in Stored XSS on the OAuth Client's name will cause users interacting with it will execute payload. This attack appear to be exploitable via The victim must be tricked to click an opaque link to the web view that runs the XSS payload. A malicious version virtually indistinguishable from a normal link. This vulnerability appears to have been fixed in 4.2.6, 4.3.0.

CVE-2018-1000088 Affected Doorkeeper Versions

1 component(s)
Fixed Versions:
4.2.6
Product / Package Ecosystem Affected Versions Fixed Version
doorkeeper
gem/doorkeeper
RubyGems
≥ 2.1.0
< 4.2.6
4.2.6

References

NVD — CVE-2018-1000088 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000088
Doorkeeper Source Repository REPOSITORY
https://github.com/doorkeeper-gem/doorkeeper/issues/969
Doorkeeper Source Repository REPOSITORY
https://github.com/doorkeeper-gem/doorkeeper/pull/970
Doorkeeper Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/pull/328/files
Security Fix Commit FIX COMMIT
https://github.com/doorkeeper-gem/doorkeeper/commit/7b1a8373ecd69768c896000c7971dbf48948c1b5
blog.justinbull.ca/cve-2018-1000088-st... WEB
https://blog.justinbull.ca/cve-2018-1000088-stored-xss-in-doorkeeper
Doorkeeper Source Repository REPOSITORY
https://github.com/doorkeeper-gem/doorkeeper
Doorkeeper Release RELEASE
https://github.com/doorkeeper-gem/doorkeeper/releases/tag/v4.3.0
Doorkeeper Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/doorkeeper/CVE-2018-1000088.yml

Frequently Asked Questions

What is CVE-2018-1000088?
CVE-2018-1000088 is a security vulnerability in Doorkeeper involving Doorkeeper is vulnerable to stored XSS and code execution under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Doorkeeper versions are affected?
Affected versions include releases prior to 4.2.6 across affected packages: doorkeeper.
What version fixes CVE-2018-1000088?
Upgrading to 4.2.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is doorkeeper affected?
Yes, doorkeeper is affected in releases prior to 4.2.6. Upgrade your dependency to 4.2.6 or later.
What is the CVSS score of CVE-2018-1000088?
CVE-2018-1000088 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2018-1000088?
CVE-2018-1000088 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check RubyGems dependencies for CVE-2018-1000088?
Run the dependency tree command: 'inspect dependencies for doorkeeper'. 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-hwhh-2fwm-cfgw",
  "modified" : "2022-04-26T17:36:10Z",
  "published" : "2018-03-13T20:44:48Z",
  "aliases" : [ "CVE-2018-1000088" ],
  "summary" : "Doorkeeper is vulnerable to stored XSS and code execution",
  "details" : "Doorkeeper version 2.1.0 through 4.2.5 contains a Cross Site Scripting (XSS) vulnerability in web view's OAuth app form, user authorization prompt web view that can result in Stored XSS on the OAuth Client's name will cause users interacting with it will execute payload. This attack appear to be exploitable via The victim must be tricked to click an opaque link to the web view that runs the XSS payload. A malicious version virtually indistinguishable from a normal link. This vulnerability appears to have been fixed in 4.2.6, 4.3.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "doorkeeper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.1.0"
      }, {
        "fixed" : "4.2.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.2.5"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000088"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/doorkeeper-gem/doorkeeper/issues/969"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/doorkeeper-gem/doorkeeper/pull/970"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/pull/328/files"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/doorkeeper-gem/doorkeeper/commit/7b1a8373ecd69768c896000c7971dbf48948c1b5"
  }, {
    "type" : "WEB",
    "url" : "https://blog.justinbull.ca/cve-2018-1000088-stored-xss-in-doorkeeper"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/doorkeeper-gem/doorkeeper"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/doorkeeper-gem/doorkeeper/releases/tag/v4.3.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/doorkeeper/CVE-2018-1000088.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:41:16Z",
    "nvd_published_at" : null
  }
}