Vendor: ZSPACE
Affected products: Q2C NAS ≤ v1.1.0210050
Vendor Homepage: https://www.zspace.cn/
Vendor contact information: https://www.zspace.cn/about/ - kf@zspace.cn
A vulnerability exists in the ZSPACE Q2C NAS device (firmware version ≤ v1.1.0210050), allowing unauthorized remote command execution (RCE). An attacker can inject and execute arbitrary malicious commands into the remote target device by sending a specially crafted POST request to the /v2/file/safe/close interface without authorization verification. This allows the attacker to gain root privileges on the remote device and completely control and take over the victim's NAS.
In the binary file /zspace/applications/services/zfilev2/zfilev2, the corresponding handler function for the /v2/file/safe/close interface is zfilev2_api.CloseSafe.
In the zfilev2_api.CloseSafe function, the value of the safe_dir field passed in the POST request is obtained, and then the clean process is performed. Then it needs to be verified by the zfilev2_pkg_zfspath_PathIsSnapshot function, otherwise an error will be reported.
In the zfilev2_pkg_zfspath_PathIsSnapshot function, the /tmp/zfsv3 prefix (if present) is first removed, and then regular expression matching is performed.
The regular expression for matching is as follows (^/(sata\\\\d+|nvme\\\\d+|esata\\\\d+)/snapshot/). It must conform to this format, for example, /sata11/snapshot/ .
After inspection, the safe_dir field is ultimately appended to the command and executed without any filtering.