{
  "schema_version": "1.7.0",
  "id": "MGASA-2020-0315",
  "published": "2020-08-16T12:06:16Z",
  "modified": "2020-08-16T11:33:05Z",
  "summary": "Updated mumble packages fix security vulnerability",
  "details": "Updated mumble package fixes security vulnerability:\n\n\nOCB2 is known to be broken under certain conditions:\nhttps://eprint.iacr.org/2019/311\n\nTo execute the universal attacks described in the paper, an attacker\nneeds access to an encryption oracle that allows it to perform encryption\nqueries with attacker-chosen nonce. Luckily in Mumble the encryption nonce\nis a fixed counter which is far too restrictive for the universal attacks\nto be feasible against Mumble.\n\nThe basic attacks do not require an attacker-chosen nonce and as such are\nmore applicable to Mumble. They are however of limited use and do require\nan en- and a decryption oracle which Mumble seemingly does not provide at\nthe same time.\n\nTo be on the safe side, this commit implements the counter-cryptanalysis\nmeasure described in the paper in section 9 for the sender and receiver side.\nThis way if either server of client are patched, their communication is almost\ncertainly (merely lacking formal proof) not susceptible to the attacks described\nin the paper.\n\n\nFixed: Potential exploit in the OCB2 encryption (#4227)\n",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://advisories.mageia.org/MGASA-2020-0315.html"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.mageia.org/show_bug.cgi?id=26746"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/mumble-voip/mumble/issues/4219"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mumble-voip/mumble/pull/4227"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Mageia:7",
        "name": "mumble",
        "purl": "pkg:rpm/mageia/mumble?arch=source&distro=mageia-7"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.2-1.mga7"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "section": "core"
      }
    }
  ],
  "credits": [
    {
      "name": "Mageia",
      "type": "COORDINATOR",
      "contact": [
        "https://wiki.mageia.org/en/Packages_Security_Team"
      ]
    }
  ]
}