CVE-2018-14505: Mitmproxy Mitmweb Vulnerability

CRITICAL
Advisory Identifier: GHSA-6m53-c78q-7qmg
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CVSS 8.8
CWE-20
Published
Advisory Summary

CVE-2018-14505 is a CRITICAL (CVSS 8.8) mitmweb vulnerability (CWE-20: Improper Input Validation) affecting Mitmproxy libraries in the PyPI ecosystem. The issue involves mitmweb in mitmproxy allows dns rebinding attacks. Remediation is available by upgrading affected packages to version 4.0.4.

CVE-2018-14505 at a Glance

CVE Identifier CVE-2018-14505
GHSA Identifier GHSA-6m53-c78q-7qmg
Severity CRITICAL
CVSS v3.1 Base Score 8.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Mitmproxy
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2018-14505

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

mitmproxy fixed: 4.0.4 
pip install mitmproxy>=4.0.4
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 mitmproxy

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-14505, inspect your installed packages using pip:

pip show mitmproxy

Analyze the terminal output to locate any version of Mitmproxy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.4), your application is affected.

Note: The pip show mitmproxy 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 Mitmproxy, 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

mitmweb in mitmproxy before v4.0.4 allows DNS Rebinding attacks, related to tools/web/app.py.

CVE-2018-14505 Affected Mitmproxy Versions

1 component(s)
Fixed Versions:
4.0.4
Product / Package Ecosystem Affected Versions Fixed Version
mitmproxy
pypi/mitmproxy
PyPI
< 4.0.4
4.0.4

References

NVD — CVE-2018-14505 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-14505
Mitmproxy Source Repository REPOSITORY
https://github.com/mitmproxy/mitmproxy/issues/3234
Mitmproxy Source Repository REPOSITORY
https://github.com/mitmproxy/mitmproxy/pull/3243
Security Fix Commit FIX COMMIT
https://github.com/mitmproxy/mitmproxy/commit/7f464b89296881f4d9ec032378c4418e832d17e3
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-6m53-c78q-7qmg
Mitmproxy Source Repository REPOSITORY
https://github.com/mitmproxy/mitmproxy
Mitmproxy Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/mitmproxy/PYSEC-2018-56.yaml

Frequently Asked Questions

What is CVE-2018-14505?
CVE-2018-14505 is a security vulnerability in Mitmproxy involving Mitmweb in mitmproxy allows DNS Rebinding attacks under CWE-20: Improper Input Validation.
Which Mitmproxy versions are affected?
Affected versions include releases prior to 4.0.4 across affected packages: mitmproxy.
What version fixes CVE-2018-14505?
Upgrading to 4.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mitmproxy affected?
Yes, mitmproxy is affected in releases prior to 4.0.4. Upgrade your dependency to 4.0.4 or later.
What is the CVSS score of CVE-2018-14505?
CVE-2018-14505 has a CVSS v3.1 base score of 8.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-14505?
CVE-2018-14505 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-2018-14505?
Run the dependency tree command: 'pip show mitmproxy'. 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-6m53-c78q-7qmg",
  "modified" : "2024-10-01T19:29:59Z",
  "published" : "2018-07-31T18:18:19Z",
  "aliases" : [ "CVE-2018-14505" ],
  "summary" : "Mitmweb in mitmproxy allows DNS Rebinding attacks",
  "details" : "mitmweb in mitmproxy before v4.0.4 allows DNS Rebinding attacks, related to tools/web/app.py.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "mitmproxy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-14505"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mitmproxy/mitmproxy/issues/3234"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mitmproxy/mitmproxy/pull/3243"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mitmproxy/mitmproxy/commit/7f464b89296881f4d9ec032378c4418e832d17e3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-6m53-c78q-7qmg"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mitmproxy/mitmproxy"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/mitmproxy/PYSEC-2018-56.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:19:42Z",
    "nvd_published_at" : null
  }
}