Quark Cloud Drive 3.23.2 regsvr32.exe uncontrolled search path

Summaryinfo

A vulnerability was found in Quark Cloud Drive 3.23.2. It has been rated as problematic. The impacted element is an unknown function of the file regsvr32.exe. This manipulation causes uncontrolled search path. The identification of this vulnerability is CVE-2025-63685. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Quark Cloud Drive 3.23.2. Affected by this vulnerability is an unknown function of the file regsvr32.exe. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. The CWE definition for the vulnerability is CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Quark Cloud Drive v3.23.2 has a DLL Hijacking vulnerability. This vulnerability stems from the insecure loading of system libraries. Specifically, the application does not validate the path or signature of [regsvr32.exe] it loads. An attacker can place a crafted malicious DLL in the application's startup directory, which will be loaded and executed when the user launches the program.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-63685 since 10/27/2025. The exploitation appears to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/21/2025). MITRE ATT&CK project uses the attack technique T1574 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Cloud Software

Vendor

• Quark

Name

• Cloud Drive

Version

• 3.23.2

CPE 2.3info

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CPE 2.2info

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Entryinfo

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