rhsa-2018_0591
Vulnerability from csaf_redhat
Published
2018-03-26 14:45
Modified
2024-11-05 20:26
Summary
Red Hat Security Advisory: python-paramiko security and bug fix update

Notes

Topic
An update for python-paramiko is now available for Red Hat Enterprise Linux 7 Extras. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The python-paramiko package provides a Python module that implements the SSH2 protocol for encrypted and authenticated connections to remote machines. Unlike SSL, the SSH2 protocol does not require hierarchical certificates signed by a powerful central authority. The protocol also includes the ability to open arbitrary channels to remote services across an encrypted tunnel. Security Fix(es): * python-paramiko: Authentication bypass in transport.py (CVE-2018-7750) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * python-paramiko has been using the python2-pyasn1 package, but did not depend on it. With new versions of python2-cryptography, python2-pyasn1 was not getting installed and this caused python-paramiko to malfunction. This bug was fixed by making python-paramiko depend on python2-pyasn1 explicitly. (BZ#1559133)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


To clipboard 

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        "text": "An update for python-paramiko is now available for Red Hat Enterprise Linux 7 Extras.\n\nRed Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
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        "text": "The python-paramiko package provides a Python module that implements the SSH2 protocol for encrypted and authenticated connections to remote machines. Unlike SSL, the SSH2 protocol does not require hierarchical certificates signed by a powerful central authority. The protocol also includes the ability to open arbitrary channels to remote services across an encrypted tunnel.\n\nSecurity Fix(es):\n\n* python-paramiko: Authentication bypass in transport.py (CVE-2018-7750)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* python-paramiko has been using the python2-pyasn1 package, but did not depend on it. With new versions of python2-cryptography, python2-pyasn1 was not getting installed and this caused python-paramiko to malfunction. This bug was fixed by making python-paramiko depend on python2-pyasn1 explicitly. (BZ#1559133)",
        "title": "Details"
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    "title": "Red Hat Security Advisory: python-paramiko security and bug fix update",
    "tracking": {
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  "vulnerabilities": [
    {
      "cve": "CVE-2018-7750",
      "cwe": {
        "id": "CWE-287",
        "name": "Improper Authentication"
      },
      "discovery_date": "2018-03-16T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1557130"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "It was found that when acting as an SSH server, paramiko did not properly check whether authentication is completed before processing other requests. A customized SSH client could use this to bypass authentication when accessing any resources controlled by paramiko.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-paramiko: Authentication bypass in transport.py",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is a user authentication bypass in the SSH Server functionality of paramiko (normally used by subclassing `paramiko.ServerInterface`). Where paramiko is used only for its client-side functionality (e.g. `paramiko.SSHClient`), the vulnerability is not exposed and thus cannot be exploited.\n\nThe following Red Hat products use paramiko only in client-side mode. Server side functionality is not used.\n\n* Red Hat Ceph Storage 2\n* Red Hat CloudForms 4\n* Red Hat Enterprise Linux 7\n* Red Hat Enterprise Virtualization\n* Red Hat Gluster Storage 3\n* Red Hat Openshift Container Platform\n* Red Hat Quick Cloud Installer\n* Red Hat Satellite 6\n* Red Hat Storage Console 2\n* Red Hat OpenStack Platform\n* Red Hat Update Infrastructure",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-7750"
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          "summary": "RHBZ#1557130",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1557130"
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        {
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-7750",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-7750"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-7750",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-7750"
        }
      ],
      "release_date": "2018-03-13T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-03-26T14:45:14+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "7Server-EXTRAS-7.4:python-paramiko-0:2.1.1-4.el7.noarch",
            "7Server-EXTRAS-7.4:python-paramiko-0:2.1.1-4.el7.src",
            "7Server-EXTRAS-7.4:python-paramiko-doc-0:2.1.1-4.el7.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "python-paramiko: Authentication bypass in transport.py"
    }
  ]
}


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