USN-2672-1 (UBUNTU-CVE-2015-2721)

Vulnerability from osv_ubuntu – Published: 2015-07-09 17:32 – Updated: 2026-04-22 07:36 – Source website
VLAI
Summary
nss vulnerabilities
Details

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721)

Watson Ladd discovered that NSS incorrectly handled Elliptical Curve Cryptography (ECC) multiplication. A remote attacker could possibly use this issue to spoof ECDSA signatures. (CVE-2015-2730)

As a security improvement, this update modifies NSS behaviour to reject DH key sizes below 768 bits, preventing a possible downgrade attack.

This update also refreshes the NSS package to version 3.19.2 which includes the latest CA certificate bundle.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2015-2721",
              "severity": [
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2015-2730",
              "severity": [
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:14.04:LTS"
        }
      },
      "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"
      ]
    }
  ],
  "aliases": [],
  "details": "Karthikeyan Bhargavan discovered that NSS incorrectly handled state\ntransitions for the TLS state machine. If a remote attacker were able to\nperform a machine-in-the-middle attack, this flaw could be exploited to skip\nthe ServerKeyExchange message and remove the forward-secrecy property.\n(CVE-2015-2721)\n\nWatson Ladd discovered that NSS incorrectly handled Elliptical Curve\nCryptography (ECC) multiplication. A remote attacker could possibly use\nthis issue to spoof ECDSA signatures. (CVE-2015-2730)\n\nAs a security improvement, this update modifies NSS behaviour to reject DH\nkey sizes below 768 bits, preventing a possible downgrade attack.\n\nThis update also refreshes the NSS package to version 3.19.2 which includes\nthe latest CA certificate bundle.\n",
  "id": "USN-2672-1",
  "modified": "2026-04-22T07:36:32Z",
  "published": "2015-07-09T17:32:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2672-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-2721"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-2730"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "nss vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2015-2721",
    "UBUNTU-CVE-2015-2730"
  ]
}



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