ubuntu-cve-2015-5296
Vulnerability from osv_ubuntu
Published
2015-12-16 00:00
Modified
2026-04-22 07:37
Summary
Details

Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libpam-smbpass",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libsmbsharemodes0",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.1.6+dfsg-1ubuntu2.14.04.11?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.1.6+dfsg-1ubuntu2.14.04.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.6.18-1ubuntu3",
        "2:4.0.10+dfsg-4ubuntu2",
        "2:4.0.13+dfsg-1ubuntu1",
        "2:4.1.3+dfsg-2ubuntu2",
        "2:4.1.3+dfsg-2ubuntu3",
        "2:4.1.3+dfsg-2ubuntu4",
        "2:4.1.3+dfsg-2ubuntu5",
        "2:4.1.6+dfsg-1ubuntu1",
        "2:4.1.6+dfsg-1ubuntu2",
        "2:4.1.6+dfsg-1ubuntu2.14.04.1",
        "2:4.1.6+dfsg-1ubuntu2.14.04.2",
        "2:4.1.6+dfsg-1ubuntu2.14.04.3",
        "2:4.1.6+dfsg-1ubuntu2.14.04.4",
        "2:4.1.6+dfsg-1ubuntu2.14.04.5",
        "2:4.1.6+dfsg-1ubuntu2.14.04.7",
        "2:4.1.6+dfsg-1ubuntu2.14.04.8",
        "2:4.1.6+dfsg-1ubuntu2.14.04.9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.3.3+dfsg-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.3.3+dfsg-1ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.3.3+dfsg-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.1.17+dfsg-4ubuntu2",
        "2:4.1.20+dfsg-1ubuntu1",
        "2:4.1.20+dfsg-1ubuntu2",
        "2:4.1.20+dfsg-1ubuntu3",
        "2:4.1.20+dfsg-1ubuntu5"
      ]
    }
  ],
  "aliases": [],
  "details": "Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.",
  "id": "UBUNTU-CVE-2015-5296",
  "modified": "2026-04-22T07:37:49Z",
  "published": "2015-12-16T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2015-5296"
    },
    {
      "type": "REPORT",
      "url": "https://www.samba.org/samba/security/CVE-2015-5296.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-2855-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2015-5296"
    }
  ],
  "related": [
    "USN-2855-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2015-5296"
  ]
}



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