RHSA-2016:0566
Vulnerability from csaf_redhat
Published
2016-03-31 23:20
Modified
2025-10-09 16:13
Summary
Red Hat Security Advisory: libssh security update

Notes

Topic
An update for libssh is now available for Red Hat Enterprise Linux 7 Extras. Red Hat Product Security has rated this update as having a security impact of Moderate. 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
libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fix(es): * A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters. (CVE-2016-0739) Red Hat would like to thank Aris Adamantiadis for reporting this issue.
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.


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      "text": "Moderate"
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    "category": "csaf_security_advisory",
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    "distribution": {
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    "notes": [
      {
        "category": "summary",
        "text": "An update for libssh 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 Moderate. 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"
      },
      {
        "category": "general",
        "text": "libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.\n\nSecurity Fix(es):\n\n* A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters. (CVE-2016-0739)\n\nRed Hat would like to thank Aris Adamantiadis for reporting this issue.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
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    "publisher": {
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    "title": "Red Hat Security Advisory: libssh security update",
    "tracking": {
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      "revision_history": [
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          "number": "1",
          "summary": "Initial version"
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          "number": "2",
          "summary": "Last updated version"
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      "status": "final",
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Aris Adamantiadis"
          ]
        }
      ],
      "cve": "CVE-2016-0739",
      "cwe": {
        "id": "CWE-704",
        "name": "Incorrect Type Conversion or Cast"
      },
      "discovery_date": "2016-01-14T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1305971"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length",
          "title": "Vulnerability summary"
        },
        {
          "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"
        }
      ],
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          "url": "https://access.redhat.com/security/cve/CVE-2016-0739"
        },
        {
          "category": "external",
          "summary": "RHBZ#1305971",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1305971"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-0739",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-0739"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-0739",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-0739"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/security/advisories/CVE-2016-0739.txt",
          "url": "https://www.libssh.org/security/advisories/CVE-2016-0739.txt"
        }
      ],
      "release_date": "2016-02-23T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2016-03-31T23:20:27+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\n\nAfter installing these updated packages, all running applications using libssh must be restarted for this update to take effect.",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2016:0566"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
            "version": "2.0"
          },
          "products": [
            "7Server-EXTRAS:libssh-0:0.7.1-2.el7.src",
            "7Server-EXTRAS:libssh-0:0.7.1-2.el7.x86_64",
            "7Server-EXTRAS:libssh-debuginfo-0:0.7.1-2.el7.x86_64",
            "7Server-EXTRAS:libssh-devel-0:0.7.1-2.el7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length"
    }
  ]
}


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