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FKIE_CVE-2016-2856

Vulnerability from fkie_nvd - Published: 2016-03-14 01:59 - Updated: 2026-06-17 00:44
Severity
8.4 (High) - CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk. NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.
References
cve@mitre.orghttp://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403
cve@mitre.orghttp://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958
cve@mitre.orghttp://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html
cve@mitre.orghttp://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2016/02/23/3
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2016/03/07/2
cve@mitre.orghttp://www.securityfocus.com/bid/84601
cve@mitre.orghttp://www.ubuntu.com/usn/USN-2985-1
cve@mitre.orghttp://www.ubuntu.com/usn/USN-2985-2
af854a3a-2127-422b-91ae-364da2661108http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403
af854a3a-2127-422b-91ae-364da2661108http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958
af854a3a-2127-422b-91ae-364da2661108http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html
af854a3a-2127-422b-91ae-364da2661108http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/02/23/3
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/03/07/2
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/84601
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2985-1
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2985-2
Impacted products
Vendor Product Version
canonical ubuntu_linux 12.04
canonical ubuntu_linux 14.04
canonical ubuntu_linux 15.10
debian debian_linux 8.0
gnu glibc *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk.  NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option."
    },
    {
      "lang": "es",
      "value": "pt_chown en el paquete glibc en versiones anteriores a 2.19-18+deb8u4 en Debian jessie; el paquete elibc en versiones anteriores a 2.15-0ubuntu10.14 en Ubuntu 12.04 LTS y en versiones anteriores a 2.19-0ubuntu6.8 en Ubuntu 14.04 LTS; y el paquete glibc en versiones anteriores a 2.21-0ubuntu4.2 en Ubuntu 15.10 y en versiones anteriores a 2.23-0ubuntu1 en Ubuntu 16.04 LTS y 16.10 carece de verificaci\u00f3n de paso de espacio de nombres asociado a la ejecuci\u00f3n del descriptor de archivo, lo que permite a usuarios locales capturar pulsaciones del teclado y suplantar datos, y posiblemente obtener privilegios, a trav\u00e9s de operaciones pts de lectura y escritura, relacionado con debian/sysdeps/linux.mk. NOTA: no est\u00e1 considerada una vulnerabilidad inicial en la GNU C Library porque la documentaci\u00f3n de distribuci\u00f3n tiene una clara recomendaci\u00f3n de seguridad frente a la opci\u00f3n --enable-pt_chown."
    }
  ],
  "id": "CVE-2016-2856",
  "lastModified": "2026-06-17T00:44:36.117",
  "metrics": {
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        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
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          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.2,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
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          "attackVector": "LOCAL",
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          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.0"
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2016-03-14T01:59:04.950",
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      "url": "http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/"
    },
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    },
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-264"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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