CVE-2021-29467 in wrongthink
Summary
by MITRE • 04/22/2021
Wrongthink is an encrypted peer-to-peer chat program. A user could check their fingerprint into the service and enter a script to run arbitrary JavaScript on the site. No workarounds exist, but a patch exists in version 2.4.1.
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Analysis
by VulDB Data Team • 04/24/2021
The vulnerability identified as CVE-2021-29467 affects Wrongthink, an encrypted peer-to-peer chat application designed for secure communications. This flaw represents a critical security weakness that allows remote code execution through a sophisticated attack vector involving user fingerprint verification and JavaScript injection. The vulnerability stems from insufficient input validation and sanitization mechanisms within the application's authentication and fingerprinting processes, creating an environment where malicious actors can exploit the system through carefully crafted user interactions.
The technical implementation of this vulnerability involves a specific attack pattern where a malicious user can manipulate the fingerprint verification system to inject and execute arbitrary JavaScript code within the context of the victim's browser session. This occurs because the application fails to properly sanitize user-provided data during the fingerprint registration process, allowing attackers to submit malicious scripts that get executed when other users interact with the compromised fingerprint data. The flaw operates at the application layer and leverages the trust model inherent in peer-to-peer systems where users verify each other's identities through fingerprint comparison mechanisms.
The operational impact of this vulnerability is severe and far-reaching within the Wrongthink ecosystem. Once exploited, the malicious JavaScript execution capability enables attackers to perform a wide range of harmful activities including but not limited to session hijacking, data exfiltration, keylogging, and establishment of persistent backdoors within the victim's system. The attack requires minimal user interaction beyond the normal fingerprint verification process, making it particularly dangerous as users may unknowingly expose themselves to compromise. This vulnerability effectively undermines the core security guarantees that peer-to-peer encrypted messaging systems are designed to provide.
Security researchers have classified this vulnerability under CWE-94, which specifically addresses "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript." The absence of workarounds means that users cannot protect themselves through configuration changes or operational procedures, making the patch release critical for system security. Organizations and individuals using Wrongthink must immediately upgrade to version 2.4.1 to mitigate this risk, as the vulnerability creates an attack surface that can be exploited without requiring specialized knowledge or access privileges. The patch addresses the root cause by implementing proper input validation and sanitization mechanisms that prevent malicious JavaScript from being executed during fingerprint verification processes.