CVE-2019-25101: TurboGears Header Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-8q38-w56m-qq2c
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CVSS 9.8
CWE-113 CWE-436
Published
Advisory Summary

CVE-2019-25101 is a CRITICAL (CVSS 9.8) header injection vulnerability (CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')) affecting TurboGears libraries in the PyPI ecosystem. The issue involves header injection in turbogears. Remediation is available by upgrading affected packages to version 1.0.11.11.

CVE-2019-25101 at a Glance

CVE Identifier CVE-2019-25101
GHSA Identifier GHSA-8q38-w56m-qq2c
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Affected Product TurboGears
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:3.1/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-2019-25101

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

TurboGears fixed: 1.0.11.11 
pip install TurboGears>=1.0.11.11
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 TurboGears

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-25101, inspect your installed packages using pip:

pip show TurboGears

Analyze the terminal output to locate any version of TurboGears in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.11.11), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting'), where the product receives data from an http agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes cr and lf characters before the data is included in outgoing http headers. In TurboGears, 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

A vulnerability classified as critical has been found in OnShift TurboGears 1.0.11.10. This affects an unknown part of the file turbogears/controllers.py of the component HTTP Header Handler. The manipulation leads to http response splitting. It is possible to initiate the attack remotely. Upgrading to version 1.0.11.11 is able to address this issue. The name of the patch is f68bbaba47f4474e1da553aa51564a73e1d92a84. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-220059.

CVE-2019-25101 Affected TurboGears Versions

1 component(s)
Fixed Versions:
1.0.11.11
Product / Package Ecosystem Affected Versions Fixed Version
TurboGears
pypi/TurboGears
PyPI
< 1.0.11.11
1.0.11.11

References

NVD — CVE-2019-25101 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-25101
TurboGears Source Repository REPOSITORY
https://github.com/OnShift/turbogears/pull/18
Security Fix Commit FIX COMMIT
https://github.com/OnShift/turbogears/commit/f68bbaba47f4474e1da553aa51564a73e1d92a84
TurboGears Source Repository REPOSITORY
https://github.com/OnShift/turbogears
TurboGears Release RELEASE
https://github.com/OnShift/turbogears/releases/tag/v1.0.11.11
vuldb.com/ WEB
https://vuldb.com/?ctiid.220059
vuldb.com/ WEB
https://vuldb.com/?id.220059

Frequently Asked Questions

What is CVE-2019-25101?
CVE-2019-25101 is a security vulnerability in TurboGears involving Header injection in TurboGears under CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting').
Which TurboGears versions are affected?
Affected versions include releases prior to 1.0.11.11 across affected packages: TurboGears.
What version fixes CVE-2019-25101?
Upgrading to 1.0.11.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is TurboGears affected?
Yes, TurboGears is affected in releases prior to 1.0.11.11. Upgrade your dependency to 1.0.11.11 or later.
What is the CVSS score of CVE-2019-25101?
CVE-2019-25101 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-25101?
CVE-2019-25101 is classified under CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') (The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.).
How can I check PyPI dependencies for CVE-2019-25101?
Run the dependency tree command: 'pip show TurboGears'. 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-8q38-w56m-qq2c",
  "modified" : "2023-02-14T21:26:39Z",
  "published" : "2023-02-04T09:30:21Z",
  "aliases" : [ "CVE-2019-25101" ],
  "summary" : "Header injection in TurboGears",
  "details" : "A vulnerability classified as critical has been found in OnShift TurboGears 1.0.11.10. This affects an unknown part of the file turbogears/controllers.py of the component HTTP Header Handler. The manipulation leads to http response splitting. It is possible to initiate the attack remotely. Upgrading to version 1.0.11.11 is able to address this issue. The name of the patch is f68bbaba47f4474e1da553aa51564a73e1d92a84. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-220059.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "TurboGears"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.11.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-25101"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OnShift/turbogears/pull/18"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OnShift/turbogears/commit/f68bbaba47f4474e1da553aa51564a73e1d92a84"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OnShift/turbogears"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OnShift/turbogears/releases/tag/v1.0.11.11"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?ctiid.220059"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?id.220059"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-113", "CWE-436" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-14T21:26:39Z",
    "nvd_published_at" : "2023-02-04T08:15:00Z"
  }
}