Vulnerability Name:

CVE-2017-6928 (CCN-139341)

Assigned:2017-02-21
Published:2017-02-21
Updated:2019-10-03
Summary:Drupal core 7.x versions before 7.57 when using Drupal's private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module is trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability. This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.
CVSS v3 Severity:5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
4.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
3.8 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:3.5 Low (CVSS v2 Vector: AV:N/AC:M/Au:S/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-732
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2017-6928

Source: XF
Type: UNKNOWN
drupal-privatefile-sec-bypass(139341)

Source: MLIST
Type: Third Party Advisory
[debian-lts-announce] 20180228 [SECURITY] [DLA 1295-1] drupal7 security update

Source: DEBIAN
Type: Issue Tracking
DSA-4123

Source: CCN
Type: SA-CORE-2018-001
Drupal core - Critical - Multiple Vulnerabilities

Source: CONFIRM
Type: Vendor Advisory
https://www.drupal.org/sa-core-2018-001

Vulnerable Configuration:Configuration 1:
  • cpe:/a:drupal:drupal:*:*:*:*:*:*:*:* (Version >= 7.0 and < 7.57)

  • Configuration 2:
  • cpe:/o:debian:debian_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:drupal:drupal:7.56:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.artful:def:20176928000
    V
    CVE-2017-6928 on Ubuntu 17.10 (artful) - untriaged.
    2018-03-01
    oval:com.ubuntu.trusty:def:20176928000
    V
    CVE-2017-6928 on Ubuntu 14.04 LTS (trusty) - low.
    2018-03-01
    oval:com.ubuntu.xenial:def:20176928000
    V
    CVE-2017-6928 on Ubuntu 16.04 LTS (xenial) - low.
    2018-03-01
    oval:com.ubuntu.xenial:def:201769280000000
    V
    CVE-2017-6928 on Ubuntu 16.04 LTS (xenial) - low.
    2018-03-01
    BACK
    drupal drupal *
    debian debian linux 7.0
    debian debian linux 8.0
    debian debian linux 9.0
    drupal drupal 7.56