Vulnerability Name:

CVE-2019-9950 (CCN-160099)

Assigned:2019-03-27
Published:2019-03-27
Updated:2020-08-24
Summary:Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR2100 and My Cloud PR4100 firmware before 2.31.174 is affected by an authentication bypass vulnerability. The login_mgr.cgi file checks credentials against /etc/shadow. However, the "nobody" account (which can be used to access the control panel API as a low-privilege logged-in user) has a default empty password, allowing an attacker to modify the My Cloud EX2 Ultra web page source code and obtain access to the My Cloud as a non-Admin My Cloud device user.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/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): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-521
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-9950

Source: MISC
Type: UNKNOWN
https://bnbdr.github.io/posts/wd/

Source: CCN
Type: WD Community Web site
New Release - My Cloud Firmware Versions 2.31.174

Source: CONFIRM
Type: Vendor Advisory
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-174-3-26-19/235932

Source: XF
Type: UNKNOWN
wd-cve20199950-sec-bypass(160099)

Source: MISC
Type: UNKNOWN
https://github.com/bnbdr/wd-rce/

Source: CONFIRM
Type: Vendor Advisory
https://support.wdc.com/downloads.aspx?g=2702&lang=en

Vulnerable Configuration:Configuration 1:
  • cpe:/o:westerndigital:my_cloud_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud:-:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:westerndigital:my_cloud_mirror_gen2_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_mirror_gen2:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:westerndigital:my_cloud_ex2_ultra_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_ex2_ultra:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:westerndigital:my_cloud_ex2100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_ex2100:-:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:westerndigital:my_cloud_ex4100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_ex4100:-:*:*:*:*:*:*:*

    • Configuration 6:
  • cpe:/o:westerndigital:my_cloud_dl2100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_dl2100:-:*:*:*:*:*:*:*

    • Configuration 7:
  • cpe:/o:westerndigital:my_cloud_dl4100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_dl4100:-:*:*:*:*:*:*:*

    • Configuration 8:
  • cpe:/o:westerndigital:my_cloud_pr2100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_pr2100:-:*:*:*:*:*:*:*

    • Configuration 9:
  • cpe:/o:westerndigital:my_cloud_pr4100_firmware:*:*:*:*:*:*:*:* (Version < 2.31.174)
  • AND
  • cpe:/h:westerndigital:my_cloud_pr4100:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/h:western_digital:my_cloud:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_ex2_ultra:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_ex2100:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_dl2100:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_dl4100:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_pr2100:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_pr4100:-:*:*:*:*:*:*:*
  • OR cpe:/h:western_digital:my_cloud_ex4100:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    westerndigital my cloud firmware *
    westerndigital my cloud -
    westerndigital my cloud mirror gen2 firmware *
    westerndigital my cloud mirror gen2 -
    westerndigital my cloud ex2 ultra firmware *
    westerndigital my cloud ex2 ultra -
    westerndigital my cloud ex2100 firmware *
    westerndigital my cloud ex2100 -
    westerndigital my cloud ex4100 firmware *
    westerndigital my cloud ex4100 -
    westerndigital my cloud dl2100 firmware *
    westerndigital my cloud dl2100 -
    westerndigital my cloud dl4100 firmware *
    westerndigital my cloud dl4100 -
    westerndigital my cloud pr2100 firmware *
    westerndigital my cloud pr2100 -
    westerndigital my cloud pr4100 firmware *
    westerndigital my cloud pr4100 -
    western_digital my cloud -
    western_digital my cloud ex2 ultra -
    western_digital my cloud ex2100 -
    western_digital my cloud dl2100 -
    western_digital my cloud dl4100 -
    western_digital my cloud pr2100 -
    western_digital my cloud pr4100 -
    western_digital my cloud ex4100 -