ubuntu-cve-2016-1908
Vulnerability from osv_ubuntu
Published
2016-01-15 00:00
Modified
2026-06-01 07:04
Summary
Details

The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          },
          {
            "binary_name": "ssh-krb5",
            "binary_version": "1:6.6p1-2ubuntu2.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.7?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:6.6p1-2ubuntu2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.2p2-6",
        "1:6.2p2-6ubuntu1",
        "1:6.4p1-1",
        "1:6.4p1-2",
        "1:6.5p1-1",
        "1:6.5p1-2",
        "1:6.5p1-3",
        "1:6.5p1-4",
        "1:6.5p1-6",
        "1:6.6p1-1",
        "1:6.6p1-2",
        "1:6.6p1-2ubuntu1",
        "1:6.6p1-2ubuntu2",
        "1:6.6p1-2ubuntu2.2",
        "1:6.6p1-2ubuntu2.3",
        "1:6.6p1-2ubuntu2.4",
        "1:6.6p1-2ubuntu2.6"
      ]
    }
  ],
  "aliases": [],
  "details": "The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.",
  "id": "UBUNTU-CVE-2016-1908",
  "modified": "2026-06-01T07:04:25Z",
  "published": "2016-01-15T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-1908"
    },
    {
      "type": "REPORT",
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-dev/2016-January/034684.html"
    },
    {
      "type": "REPORT",
      "url": "https://thejh.net/written-stuff/openssh-6.8-xsecurity"
    },
    {
      "type": "REPORT",
      "url": "http://seclists.org/oss-sec/2016/q1/115"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2966-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2016-1908"
    }
  ],
  "related": [
    "USN-2966-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2016-1908"
  ]
}



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