CVE-2018-1000805: Paramiko Authentication Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-f2j6-wrhh-v25m
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CVSS 8.8
CWE-732 CWE-863
Published
Advisory Summary

CVE-2018-1000805 is a HIGH (CVSS 8.8) authentication bypass vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting Paramiko libraries in the PyPI ecosystem. The issue involves paramiko authentication bypass vulnerability. Remediation is available by upgrading affected packages to version 2.0.9, 2.4.2, 2.3.3, 2.2.4, 2.1.6.

CVE-2018-1000805 at a Glance

CVE Identifier CVE-2018-1000805
GHSA Identifier GHSA-f2j6-wrhh-v25m
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-732: Incorrect Permission Assignment for Critical Resource
Affected Product Paramiko
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:L/UI:N/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2018-1000805

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

paramiko fixed: 2.0.9 
pip install paramiko>=2.0.9
paramiko fixed: 2.4.2 
pip install paramiko>=2.4.2
paramiko fixed: 2.3.3 
pip install paramiko>=2.3.3
paramiko fixed: 2.2.4 
pip install paramiko>=2.2.4
paramiko fixed: 2.1.6 
pip install paramiko>=2.1.6
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 paramiko

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-1000805, inspect your installed packages using pip:

pip show paramiko

Analyze the terminal output to locate any version of Paramiko in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.9), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. In Paramiko, 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

Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control vulnerability in SSH server that can result in RCE. This attack appear to be exploitable via network connectivity.

CVE-2018-1000805 Affected Paramiko Versions

5 component(s)
Fixed Versions:
2.0.92.4.22.3.32.2.42.1.6
Product / Package Ecosystem Affected Versions Fixed Version
paramiko
pypi/paramiko
PyPI
≥ 1.5.1
< 2.0.9
2.0.9
paramiko
pypi/paramiko
PyPI
≥ 2.4.0
< 2.4.2
2.4.2
paramiko
pypi/paramiko
PyPI
≥ 2.3.0
< 2.3.3
2.3.3
paramiko
pypi/paramiko
PyPI
≥ 2.2.0
< 2.2.4
2.2.4
paramiko
pypi/paramiko
PyPI
≥ 2.1.0
< 2.1.6
2.1.6

References

NVD — CVE-2018-1000805 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000805
Paramiko Source Repository REPOSITORY
https://github.com/paramiko/paramiko/issues/1283
access.redhat.com/errata/rhba-2018:34... WEB
https://access.redhat.com/errata/RHBA-2018:3497
access.redhat.com/errata/rhsa-2018:33... WEB
https://access.redhat.com/errata/RHSA-2018:3347
access.redhat.com/errata/rhsa-2018:34... WEB
https://access.redhat.com/errata/RHSA-2018:3406
access.redhat.com/errata/rhsa-2018:35... WEB
https://access.redhat.com/errata/RHSA-2018:3505
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-f2j6-wrhh-v25m
Paramiko Source Repository REPOSITORY
https://github.com/paramiko/paramiko
Paramiko Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/paramiko/PYSEC-2018-69.yaml
herolab.usd.de/wp-content/uploads/... WEB
https://herolab.usd.de/wp-content/uploads/sites/4/usd20180023.txt
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/10/msg00018.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2021/12/msg00025.html
usn.ubuntu.com/3796-1 WEB
https://usn.ubuntu.com/3796-1
usn.ubuntu.com/3796-2 WEB
https://usn.ubuntu.com/3796-2
usn.ubuntu.com/3796-3 WEB
https://usn.ubuntu.com/3796-3

Frequently Asked Questions

What is CVE-2018-1000805?
CVE-2018-1000805 is a security vulnerability in Paramiko involving Paramiko Authentication Bypass vulnerability under CWE-732: Incorrect Permission Assignment for Critical Resource.
Which Paramiko versions are affected?
Affected versions include releases prior to 2.0.9, 2.4.2, 2.3.3, 2.2.4, 2.1.6 across affected packages: paramiko.
What version fixes CVE-2018-1000805?
Upgrading to 2.0.9, 2.4.2, 2.3.3, 2.2.4, 2.1.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is paramiko affected?
Yes, paramiko is affected in releases prior to 2.0.9, 2.4.2, 2.3.3, 2.2.4, 2.1.6. Upgrade your dependency to 2.0.9, 2.4.2, 2.3.3, 2.2.4, 2.1.6 or later.
What is the CVSS score of CVE-2018-1000805?
CVE-2018-1000805 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1000805?
CVE-2018-1000805 is classified under CWE-732: Incorrect Permission Assignment for Critical Resource (The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.).
How can I check PyPI dependencies for CVE-2018-1000805?
Run the dependency tree command: 'pip show paramiko'. 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-f2j6-wrhh-v25m",
  "modified" : "2024-10-09T20:55:50Z",
  "published" : "2018-10-10T16:10:10Z",
  "aliases" : [ "CVE-2018-1000805" ],
  "summary" : "Paramiko Authentication Bypass vulnerability",
  "details" : "Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control vulnerability in SSH server that can result in RCE. This attack appear to be exploitable via network connectivity.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "paramiko"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.4.0"
      }, {
        "fixed" : "2.4.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "paramiko"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.3.0"
      }, {
        "fixed" : "2.3.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "paramiko"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2.0"
      }, {
        "fixed" : "2.2.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "paramiko"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.1.0"
      }, {
        "fixed" : "2.1.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "paramiko"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.5.1"
      }, {
        "fixed" : "2.0.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000805"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/paramiko/paramiko/issues/1283"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHBA-2018:3497"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3347"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3406"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3505"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-f2j6-wrhh-v25m"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/paramiko/paramiko"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/paramiko/PYSEC-2018-69.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://herolab.usd.de/wp-content/uploads/sites/4/usd20180023.txt"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/10/msg00018.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2021/12/msg00025.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3796-1"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3796-2"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3796-3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-732", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:33:26Z",
    "nvd_published_at" : "2018-10-08T15:29:00Z"
  }
}