CVE-2019-7313: Buildbot Buildbot CRLF Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-66x7-2r56-fj77
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CVSS 6.1
CWE-93
Published
Advisory Summary

CVE-2019-7313 is a MODERATE (CVSS 6.1) buildbot crlf injection vulnerability (CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')) affecting Buildbot libraries in the PyPI ecosystem. The issue involves buildbot crlf injection. Remediation is available by upgrading affected packages to version 1.8.1.

CVE-2019-7313 at a Glance

CVE Identifier CVE-2019-7313
GHSA Identifier GHSA-66x7-2r56-fj77
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Product Buildbot
Package Ecosystem PyPI
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-2019-7313

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: 1.8.1 
pip install buildbot>=1.8.1
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-2019-7313, 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 1.8.1), 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-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'), where the product uses crlf (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes crlf sequences from inputs. 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

`www/resource.py` in Buildbot before 1.8.1 allows CRLF injection in the Location header of `/auth/login` and `/auth/logout` via the redirect parameter. This affects other web sites in the same domain.

CVE-2019-7313 Affected Buildbot Versions

1 component(s)
Fixed Versions:
1.8.1
Product / Package Ecosystem Affected Versions Fixed Version
buildbot
pypi/buildbot
PyPI
≥ 0.9.0
< 1.8.1
1.8.1

References

NVD — CVE-2019-7313 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-7313
Buildbot Source Repository REPOSITORY
https://github.com/buildbot/buildbot/pull/4584
Security Fix Commit FIX COMMIT
https://github.com/buildbot/buildbot/commit/e781f110933e05ecdb30abc64327a2c7c9ff9c5a
Buildbot Source Repository REPOSITORY
https://github.com/buildbot/buildbot
GitHub Advisory / Wiki ADVISORY
https://github.com/buildbot/buildbot/wiki/CRLF-injection-in-Buildbot-login-and-logout-redirect-code
Buildbot Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/buildbot/PYSEC-2019-7.yaml

Frequently Asked Questions

What is CVE-2019-7313?
CVE-2019-7313 is a security vulnerability in Buildbot involving Buildbot CRLF Injection under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection').
Which Buildbot versions are affected?
Affected versions include releases prior to 1.8.1 across affected packages: buildbot.
What version fixes CVE-2019-7313?
Upgrading to 1.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is buildbot affected?
Yes, buildbot is affected in releases prior to 1.8.1. Upgrade your dependency to 1.8.1 or later.
What is the CVSS score of CVE-2019-7313?
CVE-2019-7313 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-2019-7313?
CVE-2019-7313 is classified under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') (The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.).
How can I check PyPI dependencies for CVE-2019-7313?
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-66x7-2r56-fj77",
  "modified" : "2024-09-13T17:51:51Z",
  "published" : "2022-05-14T01:36:13Z",
  "aliases" : [ "CVE-2019-7313" ],
  "summary" : "Buildbot CRLF Injection",
  "details" : "`www/resource.py` in Buildbot before 1.8.1 allows CRLF injection in the Location header of `/auth/login` and `/auth/logout` via the redirect parameter. This affects other web sites in the same domain.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "buildbot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.9.0"
      }, {
        "fixed" : "1.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-7313"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/buildbot/buildbot/pull/4584"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/buildbot/buildbot/commit/e781f110933e05ecdb30abc64327a2c7c9ff9c5a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/buildbot/buildbot"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/buildbot/buildbot/wiki/CRLF-injection-in-Buildbot-login-and-logout-redirect-code"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/buildbot/PYSEC-2019-7.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-93" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-19T21:17:46Z",
    "nvd_published_at" : "2019-02-03T08:29:00Z"
  }
}