{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/ciphertext-recovery/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["OpenSSL"],"_cs_severities":["medium"],"_cs_tags":["openssl","vulnerability","denial-of-service","information-disclosure","ciphertext-recovery"],"_cs_type":"advisory","_cs_vendors":["OpenSSL"],"content_html":"\u003cp\u003eMultiple vulnerabilities exist within OpenSSL that could be exploited by a remote attacker. These vulnerabilities can lead to a denial-of-service condition, where the service becomes unavailable to legitimate users, sensitive information disclosure, potentially exposing confidential data, or the recovery of ciphertext, compromising encrypted communications. Exploitation can occur over a network, making it accessible to a wide range of attackers. This is a significant concern for organizations relying on OpenSSL for secure communications and data protection, as successful exploitation could lead to service disruptions, data breaches, or compromised confidentiality.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable OpenSSL instance running on a server.\u003c/li\u003e\n\u003cli\u003eThe attacker sends crafted network packets to the vulnerable OpenSSL service.\u003c/li\u003e\n\u003cli\u003eThe vulnerability is triggered, leading to a denial-of-service condition, potentially crashing the service.\u003c/li\u003e\n\u003cli\u003eAlternatively, the vulnerability leads to information disclosure, where sensitive data is leaked from the server\u0026rsquo;s memory.\u003c/li\u003e\n\u003cli\u003eIn another scenario, the attacker leverages the vulnerability to recover ciphertext.\u003c/li\u003e\n\u003cli\u003eThe attacker analyzes the recovered ciphertext to decrypt sensitive communications.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these OpenSSL vulnerabilities can lead to several negative consequences. A denial-of-service attack can disrupt critical services, causing downtime and financial losses. Information disclosure can expose sensitive data, leading to data breaches and reputational damage. The recovery of ciphertext compromises encrypted communications, potentially revealing confidential information. The number of affected systems depends on the prevalence of vulnerable OpenSSL versions, but the impact could be widespread given OpenSSL\u0026rsquo;s use in numerous applications and services.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Suspicious OpenSSL Crashes\u003c/code\u003e to identify potential denial-of-service attempts against OpenSSL (logsource: \u003ccode\u003enetwork_connection\u003c/code\u003e, \u003ccode\u003eprocess_creation\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect OpenSSL Information Disclosure\u003c/code\u003e to identify suspicious network traffic patterns indicative of information leakage (logsource: \u003ccode\u003enetwork_connection\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for anomalies that could indicate exploitation attempts against OpenSSL.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-06T09:11:06Z","date_published":"2026-05-06T09:11:06Z","id":"/briefs/2024-01-openssl-vulns/","summary":"Multiple vulnerabilities in OpenSSL can be exploited by a remote attacker to conduct a denial-of-service attack, disclose information, or recover ciphertext over a network.","title":"Multiple Vulnerabilities in OpenSSL Allow for DoS, Information Disclosure, and Ciphertext Recovery","url":"https://feed.craftedsignal.io/briefs/2024-01-openssl-vulns/"}],"language":"en","title":"CraftedSignal Threat Feed — Ciphertext-Recovery","version":"https://jsonfeed.org/version/1.1"}