ubuntu-cve-2015-4000
Vulnerability from osv_ubuntu
Published
2015-05-20 00:00
Modified
2026-05-29 17:44
Summary
Details

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Severity
3.7 (Low)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
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        "binaries": [
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            "binary_name": "libssl1.0.0",
            "binary_version": "1.0.1f-1ubuntu2.12"
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            "binary_name": "openssl",
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      "package": {
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        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@1.0.1f-1ubuntu2.12?arch=source\u0026distro=trusty"
      },
      "ranges": [
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        "1:24.2.0+build1-0ubuntu1",
        "1:24.4.0+build1-0ubuntu1",
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        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.19.2-1ubuntu1"
          },
          {
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          {
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          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.19.2-1ubuntu1"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "nss",
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      },
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          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the \"Logjam\" issue.",
  "id": "UBUNTU-CVE-2015-4000",
  "modified": "2026-05-29T17:44:43Z",
  "published": "2015-05-20T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-4000"
    },
    {
      "type": "REPORT",
      "url": "https://weakdh.org/imperfect-forward-secrecy.pdf"
    },
    {
      "type": "REPORT",
      "url": "https://weakdh.org/"
    },
    {
      "type": "REPORT",
      "url": "https://nohats.ca/wordpress/blog/2015/05/20/weakdh-and-ike-ipsec/"
    },
    {
      "type": "REPORT",
      "url": "https://www.openssl.org/blog/blog/2015/05/20/logjam-freak-upcoming-changes/"
    },
    {
      "type": "REPORT",
      "url": "http://lists.gnutls.org/pipermail/gnutls-devel/2015-May/007597.html"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/articles/1456263"
    },
    {
      "type": "REPORT",
      "url": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/LogJam"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2624-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2625-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2639-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2656-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2656-2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2673-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2696-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2706-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2015-4000"
    }
  ],
  "related": [
    "USN-2624-1",
    "USN-2625-1",
    "USN-2639-1",
    "USN-2656-1",
    "USN-2656-2",
    "USN-2673-1",
    "USN-2696-1",
    "USN-2706-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2015-4000"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.