My Cloud OS 5 Firmware 5.19.117
WDC Tracking Number: WDC-22002
Published: January 13, 2022
Last Updated: June 6, 2022
Description
My Cloud OS 5 Firmware 5.19.117 includes updates to help improve the security of your My Cloud OS 5 devices.
For more information on the latest security updates, see the release notes: https://os5releasenotes.mycloud.com/#/
Advisory Summary
A flaw was discovered in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to gain potential privilege escalation. Addressed this vulnerability by updating Debian (buster) version to 2:4.9.5+dfsg-5+deb10u2.
CVE Number: CVE-2020-25717
A use-after-free vulnerability was found in the International Components for Unicode (ICU) library which could result in denial of service or potentially the execution of arbitrary code. Addressed this vulnerability by updating the Debian (buster) version to 63.1-6+deb10u2.
CVE Number: CVE-2020-21913
Addressed a command injection attack that could allow a malicious attacker on the same LAN to carry out a DNS spoofing attack via an unsecured HTTP call. This was done by removing the affected code from the product.
CVE Number: CVE-2022-22991, CVE-2022-22994
Reported By: Martin Rakhmanov (@mrakhmanov) working with Trend Micro’s Zero Day Initiative
My Cloud OS 5 was vulnerable to a pre-authenticated stack overflow vulnerability on the FTP service. Addressed the vulnerability by adding defenses against stack overflow issues.
CVE Number: CVE-2022-22989
A limited authentication bypass vulnerability was discovered that could allow an attacker to achieve remote code execution and escalate privileges on the My Cloud devices. Addressed this vulnerability by changing access token validation logic and rewriting rule logic on PHP scripts.
CVE Number: CVE-2022-22990
Reported By: Sam Thomas (@_s_n_t) of Pentest Ltd (@pentestltd) working with Trend Micro’s Zero Day Initiative