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How the mentioned CVE works:
The vulnerability CVE-2025-22096 exists due to a logical flaw in the MongoDB Rust Driver’s connection string parsing. When the option `tlsInsecure=False` is explicitly set, the underlying TLS implementation incorrectly interprets this value. The code contains a bug where the presence of the `tlsInsecure` key, regardless of its assigned boolean value, triggers a code path that disables X.509 certificate validation entirely. This occurs during the establishment of a TLS-encrypted connection to a MongoDB server. Consequently, even with a secure setting of False, the driver fails to verify the server’s certificate chain, authority, or hostname. This flaw allows an active on-path attacker to present a self-signed or invalid certificate, enabling Man-in-the-Middle (MitM) attacks where the encrypted traffic can be intercepted and decrypted.
Platform: MongoDB Rust Driver
Version: Prior to v3.2.5
Vulnerability: TLS Bypass
Severity: High
date: 2025-10-13
Prediction: Patch available
What Undercode Say:
Check current driver version in Cargo.toml
grep "mongodb" Cargo.toml
Example vulnerable connection string
mongodb://example.com:27017/?tlsInsecure=False
Code snippet showing the flawed logic (conceptual)
// if connection_string.contains_key("tlsInsecure") {
// config.tls_allow_invalid_certificates = true; // BUG: Ignores the value
// }
How Exploit:
An attacker performs a Man-in-the-Middle attack by positioning themselves between the vulnerable Rust application and the MongoDB server. They then intercept the TLS connection attempt and present a forged certificate. The vulnerable client driver, having its certificate validation disabled, accepts this invalid certificate without any warnings. This allows the attacker to fully decrypt, observe, and modify all database communications, potentially leading to data theft or manipulation.
Protection from this CVE:
Immediately upgrade the `mongodb` Rust crate to version 3.2.5 or later. This version contains the fix that ensures the `tlsInsecure` option is correctly evaluated. After upgrading, verify that the connection string does not use the `tlsInsecure` option. For secure configurations, rely on the system’s default certificate trust store or explicitly specify a correct Certificate Authority (CA) file using the `tlsCAFile` option.
Impact:
The primary impact is a complete loss of confidentiality and integrity for all data transmitted between the application and the MongoDB database. Sensitive information such as user credentials and personal data can be stolen. Additionally, an attacker could inject malicious commands or manipulate query results, leading to further application compromise.
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
