{"id":96066,"date":"2025-03-17T10:41:51","date_gmt":"2025-03-17T10:41:51","guid":{"rendered":"https:\/\/cybersecuritynews.com\/?p=96066"},"modified":"2025-03-17T10:41:54","modified_gmt":"2025-03-17T10:41:54","slug":"millions-of-rsa-key-exposes-serious-flaws","status":"publish","type":"post","link":"https:\/\/cybersecuritynews.com\/millions-of-rsa-key-exposes-serious-flaws\/","title":{"rendered":"Millions Of RSA Key Exposes Serious Flaws That Can Be Exploited"},"content":{"rendered":"\n

A disturbing security vulnerability has been uncovered affecting RSA encryption keys used across the internet, with researchers discovering that approximately 1 in 172 certificates found online are susceptible to compromise through a mathematical attack.<\/p>\n\n\n\n

This widespread vulnerability primarily impacts Internet of Things (IoT) devices but could potentially affect any system using improperly generated RSA keys.<\/p>\n\n\n\n

The vulnerability stems from inadequate random number generation during key creation, particularly in devices with limited entropy sources.<\/p>\n\n\n\n

When RSA keys are generated without sufficient randomness, they may share prime factors with other keys, making them vulnerable to factorization attacks.<\/p>\n\n\n\n

Keyfactor Security researchers identified<\/a> this critical issue after analyzing over 75 million RSA certificates collected from across the internet.<\/p>\n\n\n\n

Their analysis revealed that 435,000 certificates were compromised using a relatively simple mathematical technique, representing a significant security risk to affected systems.<\/p>\n\n\n\n

The attack exploits a fundamental property of RSA cryptography<\/a>: if two different RSA keys share a prime factor, both can be broken by computing the Greatest Common Divisor (GCD).<\/p>\n\n\n\n

While the standard factorization of large RSA moduli is computationally infeasible, calculating the GCD between two numbers that share a factor is trivial. Once a shared factor is found, the private key can be completely reconstructed.<\/p>\n\n\n\n

Technical Details Behind The Attack<\/strong><\/h2>\n\n\n\n

The researchers implemented an efficient GCD computation using the GNU MultiPrecision (GMP) library on a single cloud-based virtual machine.<\/p>\n\n\n\n

Rather than performing quadratic numbers of pairwise GCD calculations, they used a product tree and remainder tree approach that runs in sub-quadratic time. The algorithm can be expressed mathematically as:-<\/p>\n\n\n\n

GCD(n\u1d62, n\u2081 * \u2026 * n\u1d62\u208b\u2081 * n\u1d62\u208a\u2081 \u2026 * n\u2098) = GCD(n\u1d62, (n\u2081 * n\u2082 * \u2026 * n\u2098 mod n\u1d62\u00b2)\/n\u1d62)<\/p>\n\n\n\n

The research found that IoT devices<\/a> were particularly vulnerable, with approximately 50% of compromised certificates containing the name of a large network equipment manufacturer.<\/p>\n\n\n\n

Many affected devices continued to use vulnerable keys even after previous security warnings, underscoring the challenge of patching IoT systems in the field.<\/p>\n\n\n\n

The implications are especially concerning as IoT devices proliferate in sensitive settings like operating rooms, vehicles, and industrial control systems.<\/p>\n\n\n\n

Researchers emphasize that device manufacturers must ensure their products have sufficient entropy sources and adhere to cryptographic best practices<\/a> to protect users from these preventable vulnerabilities.<\/p>\n\n\n\n

Are you from SOC\/DFIR Teams? \u2013 Analyse Malware Incidents & get live Access with ANY.RUN ->\u00a0Start Now for Free<\/a>.<\/strong><\/code><\/strong><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

A disturbing security vulnerability has been uncovered affecting RSA encryption keys used across the internet, with researchers discovering that approximately 1 in 172 certificates found online are susceptible to compromise through a mathematical attack. This widespread vulnerability primarily impacts Internet of Things (IoT) devices but could potentially affect any system using improperly generated RSA keys. 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