CVE-2024-51774 in qBittorrent
Summary
by MITRE • 11/02/2024
qBittorrent before 5.0.1 proceeds with use of https URLs even after certificate validation errors.
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Analysis
by VulDB Data Team • 04/30/2025
The vulnerability identified as CVE-2024-51774 affects qBittorrent versions prior to 5.0.1 and represents a critical security flaw in the handling of secure hypertext transfer protocol connections. This issue manifests when the application processes https URLs despite encountering certificate validation errors during the connection establishment phase. The flaw essentially allows the software to continue operating with potentially compromised or untrusted SSL/TLS certificates, undermining the fundamental security assurances that secure connections are designed to provide.
From a technical perspective, this vulnerability stems from inadequate error handling within the certificate validation process. When qBittorrent attempts to establish an https connection, it should reject the connection if certificate validation fails to ensure that users are protected from man-in-the-middle attacks and other cryptographic threats. However, the flawed implementation permits continued operation even when certificate verification fails, creating a dangerous scenario where users may unknowingly connect to malicious servers that are presenting invalid certificates. This behavior directly violates established security protocols and compromises the integrity of the secure communication channel.
The operational impact of this vulnerability extends beyond simple connection failures, as it creates an environment where malicious actors can exploit the trust relationship that users expect from secure connections. Attackers could potentially present fake certificates for legitimate services or intercept traffic by presenting certificates that appear valid but are actually controlled by the attacker. This vulnerability particularly affects users who rely on qBittorrent for downloading content from https sources, as the application's failure to properly validate certificates means that any downloaded content could be compromised. The risk is exacerbated because users may not be aware that their connections are operating with invalid certificates, creating a false sense of security.
This vulnerability aligns with CWE-295 which specifically addresses improper certificate validation and can be mapped to ATT&CK technique T1071.004 for application layer protocol usage and T1566 for credential access through phishing or malicious software. The flaw essentially allows for persistent insecure connections that could be exploited for data exfiltration, credential theft, or malware distribution. Organizations and individuals using affected versions of qBittorrent should immediately update to version 5.0.1 or later to remediate this vulnerability. Additionally, system administrators should monitor for any unusual network activity that might indicate exploitation attempts, and security teams should consider implementing network detection measures to identify potential certificate validation bypass attempts. The fix implemented in version 5.0.1 ensures proper certificate validation and rejection of connections when certificate errors occur, restoring the intended security posture for https communications within the application.