CVE-2019-9949 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://bnbdr.github.io/posts/wd/ https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 https://github.com/bnbdr/wd-rce/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8