CVE-2019-12300: Buildbot Improper Authentication Vulnerability

CRITICAL
Advisory Identifier: GHSA-g86p-hgx5-2pfh
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CVSS 9.8
CWE-287
Published
Advisory Summary

CVE-2019-12300 is a CRITICAL (CVSS 9.8) improper authentication vulnerability (CWE-287: Improper Authentication) affecting Buildbot libraries in the PyPI ecosystem. The issue involves improper authentication in buildbot. Remediation is available by upgrading affected packages to version 1.8.2, 2.3.1.

CVE-2019-12300 at a Glance

CVE Identifier CVE-2019-12300
GHSA Identifier GHSA-g86p-hgx5-2pfh
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-287: Improper Authentication
Affected Product Buildbot
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:N/S:U/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 Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-12300

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

buildbot fixed: 1.8.2 
pip install buildbot>=1.8.2
buildbot fixed: 2.3.1 
pip install buildbot>=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: 

pip show buildbot

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-12300, inspect your installed packages using pip:

pip show buildbot

Analyze the terminal output to locate any version of Buildbot in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.2), your application is affected.

Note: The pip show buildbot command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Buildbot, 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

Buildbot before 1.8.2 and 2.x before 2.3.1 accepts a user-submitted authorization token from OAuth and uses it to authenticate a user. If an attacker has a token allowing them to read the user details of a victim, they can login as the victim.

CVE-2019-12300 Affected Buildbot Versions

2 component(s)
Fixed Versions:
1.8.22.3.1
Product / Package Ecosystem Affected Versions Fixed Version
buildbot
pypi/buildbot
PyPI
< 1.8.2
1.8.2
buildbot
pypi/buildbot
PyPI
≥ 2.0.0
< 2.3.1
2.3.1

References

NVD — CVE-2019-12300 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-12300
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-g86p-hgx5-2pfh
Buildbot Source Repository REPOSITORY
https://github.com/buildbot/buildbot
GitHub Advisory / Wiki ADVISORY
https://github.com/buildbot/buildbot/wiki/OAuth-vulnerability-in-using-submitted-authorization-token-for-authentication
Buildbot Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/buildbot/PYSEC-2019-6.yaml
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4XLOM2K4M4723BCLHZJEX52KJXZSEVRL
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7GXKO7OYLKBTXXXKF4VPHWT7GVYWFVYA

Frequently Asked Questions

What is CVE-2019-12300?
CVE-2019-12300 is a security vulnerability in Buildbot involving Improper Authentication in Buildbot under CWE-287: Improper Authentication.
Which Buildbot versions are affected?
Affected versions include releases prior to 1.8.2, 2.3.1 across affected packages: buildbot.
What version fixes CVE-2019-12300?
Upgrading to 1.8.2, 2.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is buildbot affected?
Yes, buildbot is affected in releases prior to 1.8.2, 2.3.1. Upgrade your dependency to 1.8.2, 2.3.1 or later.
What is the CVSS score of CVE-2019-12300?
CVE-2019-12300 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-12300?
CVE-2019-12300 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check PyPI dependencies for CVE-2019-12300?
Run the dependency tree command: 'pip show buildbot'. 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-g86p-hgx5-2pfh",
  "modified" : "2024-09-13T17:46:56Z",
  "published" : "2019-05-29T18:48:11Z",
  "aliases" : [ "CVE-2019-12300" ],
  "summary" : "Improper Authentication in Buildbot",
  "details" : "Buildbot before 1.8.2 and 2.x before 2.3.1 accepts a user-submitted authorization token from OAuth and uses it to authenticate a user. If an attacker has a token allowing them to read the user details of a victim, they can login as the victim.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "buildbot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "buildbot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-12300"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-g86p-hgx5-2pfh"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/buildbot/buildbot"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/buildbot/buildbot/wiki/OAuth-vulnerability-in-using-submitted-authorization-token-for-authentication"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/buildbot/PYSEC-2019-6.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4XLOM2K4M4723BCLHZJEX52KJXZSEVRL"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7GXKO7OYLKBTXXXKF4VPHWT7GVYWFVYA"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-05-29T18:47:56Z",
    "nvd_published_at" : "2019-05-23T15:30:00Z"
  }
}