CVE-2025-55733 in deepchat
Summary
by MITRE • 08/19/2025
DeepChat is a smart assistant that connects powerful AI to your personal world. DeepChat before 0.3.1 has a one-click remote code execution vulnerability. An attacker can exploit this vulnerability by embedding a specially crafted deepchat: URL on any website, including a malicious one they control. When a victim visits such a site or clicks on the link, the browser triggers the app’s custom URL handler (deepchat:), causing the DeepChat application to launch and process the URL, leading to remote code execution on the victim’s machine. This vulnerability is fixed in 0.3.1.
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Analysis
by VulDB Data Team • 08/20/2025
The vulnerability identified as CVE-2025-55733 represents a critical remote code execution flaw in the DeepChat smart assistant application prior to version 0.3.1. This security weakness stems from improper handling of custom URL schemes within the application's architecture, creating an attack vector that allows malicious actors to execute arbitrary code on target systems through web-based exploitation. The vulnerability specifically affects the deepchat: URL handler mechanism that is designed to launch the application when users interact with specially crafted links. This flaw demonstrates a fundamental lack of input validation and secure URL scheme handling that directly violates established security principles for application design.
The technical exploitation of this vulnerability occurs through a sophisticated attack chain that begins with the placement of a malicious deepchat: URL on a compromised or malicious website. When victims navigate to such sites or click on the embedded links, the browser automatically invokes the DeepChat application's custom URL handler, which processes the malicious URL without proper sanitization or validation. This process creates an execution environment where attacker-controlled code can be interpreted and executed with the privileges of the user running the application. The vulnerability is particularly dangerous because it requires no user interaction beyond visiting a webpage or clicking a link, making it highly effective for drive-by attacks and social engineering campaigns.
From an operational impact perspective, this vulnerability exposes users to significant risks including complete system compromise, data theft, and unauthorized access to sensitive information. The one-click nature of the exploitation means that victims need not perform any additional actions beyond normal web browsing activities, making detection and prevention extremely challenging for end users. The vulnerability affects any system running affected versions of DeepChat, regardless of operating system, and can be leveraged by attackers to establish persistent access, deploy additional malware, or conduct further reconnaissance activities. This type of vulnerability aligns with CWE-74 and CWE-94 categories, representing weaknesses in input validation and code execution that are commonly exploited in modern attack campaigns.
Security professionals should note that this vulnerability demonstrates poor application architecture practices and highlights the importance of secure handling of custom URL schemes. The fix implemented in version 0.3.1 addresses this issue through proper input validation and sanitization of URL parameters before processing. Organizations should immediately update to the patched version and implement additional monitoring for suspicious URL handling activities. The vulnerability also relates to ATT&CK technique T1059 which covers command and scripting interpreter usage, and T1133 which covers external remote services. Network administrators should consider implementing URL filtering and monitoring for deepchat: scheme usage, while endpoint protection solutions should be configured to detect and block potentially malicious URL handlers. This vulnerability serves as a reminder of the critical importance of secure application design and proper input validation in preventing remote code execution attacks that can compromise entire user environments.