ubuntu-cve-2015-2721
Vulnerability from osv_ubuntu
Published
2015-07-05 00:00
Modified
2026-04-22 07:37
Summary
Details

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Severity
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "39.0+build5-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "firefox-globalmenu",
            "binary_version": "39.0+build5-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "39.0+build5-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "firefox-testsuite",
            "binary_version": "39.0+build5-0ubuntu0.14.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@39.0+build5-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "39.0+build5-0ubuntu0.14.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "24.0+build1-0ubuntu1",
        "25.0+build3-0ubuntu0.13.10.1",
        "28.0~b2+build1-0ubuntu2",
        "28.0+build1-0ubuntu1",
        "28.0+build2-0ubuntu1",
        "28.0+build2-0ubuntu2",
        "29.0+build1-0ubuntu0.14.04.2",
        "30.0+build1-0ubuntu0.14.04.3",
        "31.0+build1-0ubuntu0.14.04.1",
        "32.0+build1-0ubuntu0.14.04.1",
        "32.0.3+build1-0ubuntu0.14.04.1",
        "33.0+build2-0ubuntu0.14.04.1",
        "34.0+build2-0ubuntu0.14.04.1",
        "35.0+build3-0ubuntu0.14.04.2",
        "35.0.1+build1-0ubuntu0.14.04.1",
        "36.0+build2-0ubuntu0.14.04.4",
        "36.0.1+build2-0ubuntu0.14.04.1",
        "36.0.4+build1-0ubuntu0.14.04.1",
        "37.0+build2-0ubuntu0.14.04.1",
        "37.0.1+build1-0ubuntu0.14.04.1",
        "37.0.2+build1-0ubuntu0.14.04.1",
        "38.0+build3-0ubuntu0.14.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "libnss3-1d",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "libnss3-nssdb",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.19.2-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:3.19.2-0ubuntu0.14.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.15.1-1ubuntu1",
        "2:3.15.2-1",
        "2:3.15.3-1",
        "2:3.15.3.1-1",
        "2:3.15.3.1-1.1",
        "2:3.15.3.1-1.1ubuntu1",
        "2:3.15.4-1ubuntu3",
        "2:3.15.4-1ubuntu4",
        "2:3.15.4-1ubuntu5",
        "2:3.15.4-1ubuntu6",
        "2:3.15.4-1ubuntu7",
        "2:3.15.4-1ubuntu7.1",
        "2:3.17-0ubuntu0.14.04.1",
        "2:3.17.1-0ubuntu0.14.04.1",
        "2:3.17.1-0ubuntu0.14.04.2",
        "2:3.17.4-0ubuntu0.14.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "thunderbird-globalmenu",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "thunderbird-testsuite",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:31.8.0+build1-0ubuntu0.14.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:31.8.0+build1-0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:31.8.0+build1-0ubuntu0.14.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:24.0+build1-0ubuntu1",
        "1:24.0+build1-0ubuntu2",
        "1:24.1.1+build1-0ubuntu0.13.10.1",
        "1:24.1.1+build1-0ubuntu1",
        "1:24.2.0+build1-0ubuntu1",
        "1:24.4.0+build1-0ubuntu1",
        "1:24.5.0+build1-0ubuntu0.14.04.1",
        "1:24.6.0+build1-0ubuntu0.14.04.1",
        "1:31.0+build1-0ubuntu0.14.04.1",
        "1:31.1.1+build1-0ubuntu0.14.04.1",
        "1:31.1.2+build1-0ubuntu0.14.04.1",
        "1:31.2.0+build2-0ubuntu0.14.04.1",
        "1:31.3.0+build1-0ubuntu0.14.04.1",
        "1:31.4.0+build1-0ubuntu0.14.04.1",
        "1:31.5.0+build1-0ubuntu0.14.04.1",
        "1:31.6.0+build1-0ubuntu0.14.04.1",
        "1:31.7.0+build1-0ubuntu0.14.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a \"SMACK SKIP-TLS\" issue.",
  "id": "UBUNTU-CVE-2015-2721",
  "modified": "2026-04-22T07:37:47Z",
  "published": "2015-07-05T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-2721"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2015-71/"
    },
    {
      "type": "REPORT",
      "url": "https://smacktls.com"
    },
    {
      "type": "REPORT",
      "url": "https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1086145"
    },
    {
      "type": "REPORT",
      "url": "http://www.mozilla.org/security/announce/2015/mfsa2015-71.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2672-1"
    },
    {
      "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": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2015-2721"
    }
  ],
  "related": [
    "USN-2672-1",
    "USN-2656-1",
    "USN-2656-2",
    "USN-2673-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2015-2721"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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