CVE-2018-19443: Tryton Session Fixation Vulnerability

HIGH
Advisory Identifier: GHSA-32w7-9whp-cjp9
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CVSS 5.9
CWE-384
Published
Advisory Summary

CVE-2018-19443 is a HIGH (CVSS 5.9) session fixation vulnerability (CWE-384: Session Fixation) affecting Tryton libraries in the PyPI ecosystem. The issue involves session fixation in tryton. Remediation is available by upgrading affected packages to version 5.0.1.

CVE-2018-19443 at a Glance

CVE Identifier CVE-2018-19443
GHSA Identifier GHSA-32w7-9whp-cjp9
Severity HIGH
CVSS v3.1 Base Score 5.9
CWE Classification CWE-384: Session Fixation
Affected Product Tryton
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2018-19443

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

tryton fixed: 5.0.1 
pip install tryton>=5.0.1
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 tryton

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-19443, inspect your installed packages using pip:

pip show tryton

Analyze the terminal output to locate any version of Tryton in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.1), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. In Tryton, 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

The client in Tryton 5.x before 5.0.1 tries to make a connection to the bus in cleartext instead of encrypted under certain circumstances in bus.py and jsonrpc.py. This connection attempt fails, but it contains in the header the current session of the user. This session could then be stolen by a man-in-the-middle.

CVE-2018-19443 Affected Tryton Versions

1 component(s)
Fixed Versions:
5.0.1
Product / Package Ecosystem Affected Versions Fixed Version
tryton
pypi/tryton
PyPI
≥ 5.0.0
< 5.0.1
All 1 versions
5.0.0
5.0.1

References

NVD — CVE-2018-19443 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-19443
Tryton Security Information SECURITY
https://bugs.tryton.org/issue7792
Tryton Release RELEASE
https://discuss.tryton.org/t/security-release-for-issue7792/830
Tryton Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/tryton/PYSEC-2018-77.yaml

Frequently Asked Questions

What is CVE-2018-19443?
CVE-2018-19443 is a security vulnerability in Tryton involving Session Fixation in Tryton under CWE-384: Session Fixation.
Which Tryton versions are affected?
Affected versions include releases prior to 5.0.1 across affected packages: tryton.
What version fixes CVE-2018-19443?
Upgrading to 5.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tryton affected?
Yes, tryton is affected in releases prior to 5.0.1. Upgrade your dependency to 5.0.1 or later.
What is the CVSS score of CVE-2018-19443?
CVE-2018-19443 has a CVSS v3.1 base score of 5.9 (HIGH) with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-19443?
CVE-2018-19443 is classified under CWE-384: Session Fixation (Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.).
How can I check PyPI dependencies for CVE-2018-19443?
Run the dependency tree command: 'pip show tryton'. 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-32w7-9whp-cjp9",
  "modified" : "2024-11-13T22:54:09Z",
  "published" : "2018-11-29T21:30:56Z",
  "aliases" : [ "CVE-2018-19443" ],
  "summary" : "Session Fixation in Tryton",
  "details" : "The client in Tryton 5.x before 5.0.1 tries to make a connection to the bus in cleartext instead of encrypted under certain circumstances in bus.py and jsonrpc.py. This connection attempt fails, but it contains in the header the current session of the user. This session could then be stolen by a man-in-the-middle.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "tryton"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.0.1"
      } ]
    } ],
    "versions" : [ "5.0.0" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-19443"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.tryton.org/issue7792"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.tryton.org/t/security-release-for-issue7792/830"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/tryton/PYSEC-2018-77.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-384" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T20:53:42Z",
    "nvd_published_at" : null
  }
}