CVE-2012-2374: Tornado Tornado CRLF Injection Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-f7fv-v9rh-prvc
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2012-2374 is a HIGH (CVSS 7.5) tornado crlf injection vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Tornado libraries in the PyPI ecosystem. The issue involves tornado crlf injection vulnerability. Remediation is available by upgrading affected packages to version 2.2.1.

CVE-2012-2374 at a Glance

CVE Identifier CVE-2012-2374
GHSA Identifier GHSA-f7fv-v9rh-prvc
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Tornado
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:H/A:N).

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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2012-2374

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

tornado fixed: 2.2.1 
pip install tornado>=2.2.1
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 tornado

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2012-2374, inspect your installed packages using pip:

pip show tornado

Analyze the terminal output to locate any version of Tornado in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.1), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Tornado, 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

CRLF injection vulnerability in the `tornado.web.RequestHandler.set_header` function in Tornado before 2.2.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via crafted input.

CVE-2012-2374 Affected Tornado Versions

1 component(s)
Fixed Versions:
2.2.1
Product / Package Ecosystem Affected Versions Fixed Version
tornado
pypi/tornado
PyPI
< 2.2.1
2.2.1

References

NVD — CVE-2012-2374 NVD
https://nvd.nist.gov/vuln/detail/CVE-2012-2374
Security Fix Commit FIX COMMIT
https://github.com/tornadoweb/tornado/commit/1ae91f6d58e6257e0ab49d295d8741ce1727bdb7
Tornado Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/tornado/PYSEC-2012-5.yaml
Tornado Source Repository REPOSITORY
https://github.com/tornadoweb/tornado
web.archive.org/web/20140720192646/... WEB
https://web.archive.org/web/20140720192646/http://secunia.com/advisories/49185
Tornado Security Information SECURITY
https://web.archive.org/web/20200229124524/http://www.securityfocus.com/bid/53612
Tornado Security Information SECURITY
http://openwall.com/lists/oss-security/2012/05/18/12
Tornado Security Information SECURITY
http://www.openwall.com/lists/oss-security/2012/05/18/6
Tornado Release RELEASE
http://www.tornadoweb.org/documentation/releases/v2.2.1.html

Frequently Asked Questions

What is CVE-2012-2374?
CVE-2012-2374 is a security vulnerability in Tornado involving Tornado CRLF injection vulnerability under CWE-20: Improper Input Validation.
Which Tornado versions are affected?
Affected versions include releases prior to 2.2.1 across affected packages: tornado.
What version fixes CVE-2012-2374?
Upgrading to 2.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tornado affected?
Yes, tornado is affected in releases prior to 2.2.1. Upgrade your dependency to 2.2.1 or later.
What is the CVSS score of CVE-2012-2374?
CVE-2012-2374 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2012-2374?
CVE-2012-2374 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2012-2374?
Run the dependency tree command: 'pip show tornado'. 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-f7fv-v9rh-prvc",
  "modified" : "2024-11-18T22:05:52Z",
  "published" : "2022-05-17T05:23:55Z",
  "aliases" : [ "CVE-2012-2374" ],
  "summary" : "Tornado CRLF injection vulnerability",
  "details" : "CRLF injection vulnerability in the `tornado.web.RequestHandler.set_header` function in Tornado before 2.2.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via crafted input.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "tornado"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2012-2374"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tornadoweb/tornado/commit/1ae91f6d58e6257e0ab49d295d8741ce1727bdb7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/tornado/PYSEC-2012-5.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tornadoweb/tornado"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20140720192646/http://secunia.com/advisories/49185"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20200229124524/http://www.securityfocus.com/bid/53612"
  }, {
    "type" : "WEB",
    "url" : "http://openwall.com/lists/oss-security/2012/05/18/12"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2012/05/18/6"
  }, {
    "type" : "WEB",
    "url" : "http://www.tornadoweb.org/documentation/releases/v2.2.1.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-01T11:01:31Z",
    "nvd_published_at" : "2012-05-23T20:55:00Z"
  }
}