CVE-2022-2255: Mod wsgi Incorrect Header Handling Vulnerability

HIGH
Advisory Identifier: GHSA-7527-8855-9cf8
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CVSS 7.5
CWE-345
Published
Advisory Summary

CVE-2022-2255 is a HIGH (CVSS 7.5) incorrect header handling vulnerability (CWE-345: Insufficient Verification of Data Authenticity) affecting Mod wsgi libraries in the PyPI ecosystem. The issue involves incorrect header handling in mod-wsgi. Remediation is available by upgrading affected packages to version 4.9.3.

CVE-2022-2255 at a Glance

CVE Identifier CVE-2022-2255
GHSA Identifier GHSA-7527-8855-9cf8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-345: Insufficient Verification of Data Authenticity
Affected Product Mod wsgi
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-2022-2255

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

mod-wsgi fixed: 4.9.3 
pip install mod-wsgi>=4.9.3
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 mod-wsgi

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-2255, inspect your installed packages using pip:

pip show mod-wsgi

Analyze the terminal output to locate any version of Mod wsgi in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.9.3), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-345: Insufficient Verification of Data Authenticity, where the product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. In Mod wsgi, 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 was found in mod_wsgi. The X-Client-IP header is not removed from a request from an untrusted proxy, allowing an attacker to pass the X-Client-IP header to the target WSGI application because the condition to remove it is missing.

CVE-2022-2255 Affected Mod wsgi Versions

1 component(s)
Fixed Versions:
4.9.3
Product / Package Ecosystem Affected Versions Fixed Version
mod-wsgi
pypi/mod-wsgi
PyPI
< 4.9.3
4.9.3

References

NVD — CVE-2022-2255 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-2255
Security Fix Commit FIX COMMIT
https://github.com/GrahamDumpleton/mod_wsgi/commit/af3c0c2736bc0b0b01fa0f0aad3c904b7fa9c751
Mod wsgi Source Repository REPOSITORY
https://github.com/GrahamDumpleton/mod_wsgi
Mod wsgi Source Repository REPOSITORY
https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941
Mod wsgi Source Repository REPOSITORY
https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082
Mod wsgi Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/mod-wsgi/PYSEC-2022-254.yaml
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html
Mod wsgi Release RELEASE
https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html

Frequently Asked Questions

What is CVE-2022-2255?
CVE-2022-2255 is a security vulnerability in Mod wsgi involving Incorrect header handling in mod-wsgi under CWE-345: Insufficient Verification of Data Authenticity.
Which Mod wsgi versions are affected?
Affected versions include releases prior to 4.9.3 across affected packages: mod-wsgi.
What version fixes CVE-2022-2255?
Upgrading to 4.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mod-wsgi affected?
Yes, mod-wsgi is affected in releases prior to 4.9.3. Upgrade your dependency to 4.9.3 or later.
What is the CVSS score of CVE-2022-2255?
CVE-2022-2255 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-2022-2255?
CVE-2022-2255 is classified under CWE-345: Insufficient Verification of Data Authenticity (The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.).
How can I check PyPI dependencies for CVE-2022-2255?
Run the dependency tree command: 'pip show mod-wsgi'. 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-7527-8855-9cf8",
  "modified" : "2024-09-25T20:02:55Z",
  "published" : "2022-08-26T00:03:30Z",
  "aliases" : [ "CVE-2022-2255" ],
  "summary" : "Incorrect header handling in mod-wsgi",
  "details" : "A vulnerability was found in mod_wsgi. The X-Client-IP header is not removed from a request from an untrusted proxy, allowing an attacker to pass the X-Client-IP header to the target WSGI application because the condition to remove it is missing.",
  "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" : "mod-wsgi"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-2255"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GrahamDumpleton/mod_wsgi/commit/af3c0c2736bc0b0b01fa0f0aad3c904b7fa9c751"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/GrahamDumpleton/mod_wsgi"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/mod-wsgi/PYSEC-2022-254.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html"
  }, {
    "type" : "WEB",
    "url" : "https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-345" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-08-30T20:55:04Z",
    "nvd_published_at" : "2022-08-25T18:15:00Z"
  }
}