National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-9949 Detail

Current Description

Western Digital My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 and PR4100 before firmware 2.31.183 are affected by a code execution (as root, starting from a low-privilege user session) vulnerability. The cgi-bin/webfile_mgr.cgi file allows arbitrary file write by abusing symlinks. Specifically, this occurs by uploading a tar archive that contains a symbolic link, then uploading another archive that writes a file to the link using the "cgi_untar" command. Other commands might also be susceptible. Code can be executed because the "name" parameter passed to the cgi_unzip command is not sanitized.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 8.8 HIGH
Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 2.8


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 9.0 HIGH
Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C) (V2 legend)
Impact Subscore: 10.0
Exploitability Subscore: 8.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://bnbdr.github.io/posts/wd/ Exploit Third Party Advisory
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 Vendor Advisory
https://github.com/bnbdr/wd-rce/ Exploit Third Party Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_mirror_gen2_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_mirror_gen2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 3 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_ex2_ultra_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_ex2_ultra:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 4 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_ex2100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_ex2100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 5 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_ex4100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_ex4100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 6 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_dl2100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_dl2100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 7 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_dl4100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_dl4100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 8 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_pr2100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_pr2100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 9 ( hide )
 cpe:2.3:o:westerndigital:my_cloud_pr4100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
2.31.183
Running on/with
 cpe:2.3:h:westerndigital:my_cloud_pr4100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-9949
NVD Published Date:
05/23/2019
NVD Last Modified:
05/28/2019