CVE-2020-7655: Netius HTTP Request Smuggling Vulnerability

MODERATE
Advisory Identifier: GHSA-wm2m-xrrp-j74c
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CVSS 6.1
CWE-444
Published
Advisory Summary

CVE-2020-7655 is a MODERATE (CVSS 6.1) http request smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Netius libraries in the PyPI ecosystem. The issue involves http request smuggling in netius. Remediation is available by upgrading affected packages to version 1.17.58.

CVE-2020-7655 at a Glance

CVE Identifier CVE-2020-7655
GHSA Identifier GHSA-wm2m-xrrp-j74c
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Product Netius
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:3.1/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-2020-7655

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

netius fixed: 1.17.58 
pip install netius>=1.17.58
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 netius

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-7655, inspect your installed packages using pip:

pip show netius

Analyze the terminal output to locate any version of Netius in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.17.58), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. In Netius, 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

netius prior to 1.17.58 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Transfer encoding header parsing which could allow for CL:TE or TE:TE attacks.

CVE-2020-7655 Affected Netius Versions

1 component(s)
Fixed Versions:
1.17.58
Product / Package Ecosystem Affected Versions Fixed Version
netius
pypi/netius
PyPI
< 1.17.58
1.17.58

References

NVD — CVE-2020-7655 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7655
Security Fix Commit FIX COMMIT
https://github.com/hivesolutions/netius/commit/9830881ef68328f8ea9c7901db1d11690677e7d1
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-wm2m-xrrp-j74c
Netius Source Repository REPOSITORY
https://github.com/hivesolutions/netius
Netius Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/netius/PYSEC-2020-242.yaml
snyk.io/vuln/snyk-python-ne... WEB
https://snyk.io/vuln/SNYK-PYTHON-NETIUS-569141

Frequently Asked Questions

What is CVE-2020-7655?
CVE-2020-7655 is a security vulnerability in Netius involving HTTP Request Smuggling in netius under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling').
Which Netius versions are affected?
Affected versions include releases prior to 1.17.58 across affected packages: netius.
What version fixes CVE-2020-7655?
Upgrading to 1.17.58 (or the latest patched release for your respective branch) resolves the vulnerability.
Is netius affected?
Yes, netius is affected in releases prior to 1.17.58. Upgrade your dependency to 1.17.58 or later.
What is the CVSS score of CVE-2020-7655?
CVE-2020-7655 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-7655?
CVE-2020-7655 is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.).
How can I check PyPI dependencies for CVE-2020-7655?
Run the dependency tree command: 'pip show netius'. 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-wm2m-xrrp-j74c",
  "modified" : "2024-10-07T15:08:10Z",
  "published" : "2021-06-18T18:31:40Z",
  "aliases" : [ "CVE-2020-7655" ],
  "summary" : "HTTP Request Smuggling in netius",
  "details" : "netius prior to 1.17.58 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Transfer encoding header parsing which could allow for CL:TE or TE:TE attacks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/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" : "netius"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.17.58"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7655"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hivesolutions/netius/commit/9830881ef68328f8ea9c7901db1d11690677e7d1"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-wm2m-xrrp-j74c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hivesolutions/netius"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/netius/PYSEC-2020-242.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-PYTHON-NETIUS-569141"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-14T21:29:08Z",
    "nvd_published_at" : "2020-05-21T15:15:00Z"
  }
}