High severity8.8NVD Advisory· Published May 23, 2019· Updated Jun 17, 2026
CVE-2019-9949
CVE-2019-9949
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.
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Affected products
13- cpe:2.3:o:westerndigital:my_cloud_dl2100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_dl4100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_ex2100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_ex2_ultra_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_ex4100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_mirror_gen2_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_pr2100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- cpe:2.3:o:westerndigital:my_cloud_pr4100_firmware:*:*:*:*:*:*:*:*Range: <2.31.183
- Western Digital/My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 and PR4100description
- Range: <2.31.183
- Range: <2.31.183
- Range: <2.31.183
Patches
Vulnerability mechanics
References
2- bnbdr.github.io/posts/wd/nvdExploitThird Party Advisory
- community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717nvdVendor Advisory
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