{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/firebird/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.2,"id":"CVE-2026-27890"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Firebird"],"_cs_severities":["high"],"_cs_tags":["cve","dos","firebird"],"_cs_type":"advisory","_cs_vendors":["Firebird"],"content_html":"\u003cp\u003eFirebird is a widely used open-source relational database management system. A vulnerability exists in versions prior to 5.0.4, 4.0.7, and 3.0.14 related to the processing of CNCT_specific_data segments during the authentication handshake. The Firebird server incorrectly assumes that these segments will arrive in strictly ascending order. An attacker who can establish a network connection to the Firebird server (knowing the IP address and port) can send crafted authentication packets with out-of-order segments. This causes the \u003ccode\u003eArray\u003c/code\u003e class's \u003ccode\u003egrow()\u003c/code\u003e method to compute a negative size, resulting in a SIGSEGV crash and subsequent denial-of-service. This vulnerability allows for easy remote exploitation without requiring any valid credentials, making patching a priority.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Firebird server by scanning for the default port (3050).\u003c/li\u003e\n\u003cli\u003eAttacker initiates a TCP connection to the Firebird server on port 3050.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a CNCT_protocol message to initiate the authentication process.\u003c/li\u003e\n\u003cli\u003eThe attacker sends CNCT_specific_data segments within the authentication packet, intentionally sending them out of order (e.g., segment 2 before segment 1).\u003c/li\u003e\n\u003cli\u003eThe Firebird server receives the out-of-order CNCT_specific_data segments and attempts to process them.\u003c/li\u003e\n\u003cli\u003eWithin the \u003ccode\u003eArray\u003c/code\u003e class's \u003ccode\u003egrow()\u003c/code\u003e method, a negative size value is calculated due to the incorrect segment order.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003egrow()\u003c/code\u003e method attempts to allocate a negative-sized array, triggering a SIGSEGV signal.\u003c/li\u003e\n\u003cli\u003eThe Firebird server process crashes, resulting in a denial-of-service condition.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability leads to a denial-of-service condition on the Firebird server. This can disrupt critical applications relying on the database, causing data unavailability and potential data loss due to unsaved transactions. The impact is significant because the vulnerability is remotely exploitable without authentication, potentially affecting any exposed Firebird instance. The number of potential victims is difficult to quantify but includes any organization running vulnerable Firebird versions.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately upgrade Firebird servers to versions 5.0.4, 4.0.7, or 3.0.14 to patch CVE-2026-27890.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Firebird Authentication Attempt\u003c/code\u003e to detect potential exploitation attempts by monitoring network connections to port 3050.\u003c/li\u003e\n\u003cli\u003eConsider implementing network segmentation to limit exposure of Firebird servers to untrusted networks.\u003c/li\u003e\n\u003cli\u003eImplement rate limiting on connections to the Firebird server port to mitigate the impact of rapid connection attempts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-29T12:00:00Z","date_published":"2024-01-29T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-29-firebird-dos/","summary":"An unauthenticated attacker can crash Firebird database servers prior to versions 5.0.4, 4.0.7 and 3.0.14 by sending out-of-order CNCT_specific_data segments during the authentication process, leading to a denial-of-service condition.","title":"Firebird Server Denial-of-Service via Out-of-Order Authentication Segments","url":"https://feed.craftedsignal.io/briefs/2024-01-29-firebird-dos/"},{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2026-28212"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Firebird"],"_cs_severities":["medium"],"_cs_tags":["firebird","denial-of-service","cve-2026-28212"],"_cs_type":"advisory","_cs_vendors":["Firebird"],"content_html":"\u003cp\u003eFirebird is an open-source relational database management system. A denial-of-service vulnerability exists in Firebird versions prior to 6.0.0, 5.0.4, 4.0.7 and 3.0.14 due to improper handling of \u003ccode\u003eop_slice\u003c/code\u003e network packets. Specifically, the server passes an unprepared structure containing a null pointer to the \u003ccode\u003eSDL_info()\u003c/code\u003e function. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted packet to the server's network port, causing a null pointer dereference and subsequent server crash. This vulnerability, identified as CVE-2026-28212, can disrupt database services, affecting applications reliant on the Firebird database. The vulnerability was patched in versions 6.0.0, 5.0.4, 4.0.7 and 3.0.14.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Firebird server running a version prior to 6.0.0, 5.0.4, 4.0.7 or 3.0.14.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious \u003ccode\u003eop_slice\u003c/code\u003e network packet specifically designed to trigger the vulnerability.\u003c/li\u003e\n\u003cli\u003eAttacker establishes a network connection to the Firebird server's port (typically 3050).\u003c/li\u003e\n\u003cli\u003eAttacker sends the crafted \u003ccode\u003eop_slice\u003c/code\u003e packet to the Firebird server.\u003c/li\u003e\n\u003cli\u003eThe server processes the malicious packet, passing an unprepared structure with a null pointer to the \u003ccode\u003eSDL_info()\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eSDL_info()\u003c/code\u003e function attempts to dereference the null pointer.\u003c/li\u003e\n\u003cli\u003eA null pointer dereference occurs, leading to a server crash.\u003c/li\u003e\n\u003cli\u003eThe Firebird database server becomes unavailable, resulting in a denial-of-service condition.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-28212 results in a denial-of-service condition, rendering the Firebird database server unavailable. This can disrupt applications and services that rely on the database, leading to data unavailability and potential business interruption. While the vulnerability itself does not lead to data compromise, the loss of availability can have significant operational and financial consequences. This issue affects versions of Firebird prior to 6.0.0, 5.0.4, 4.0.7, and 3.0.14.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Firebird database servers to version 6.0.0, 5.0.4, 4.0.7 or 3.0.14 or later to patch CVE-2026-28212.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Firebird SDL_info Null Pointer Dereference\u003c/code\u003e to identify potential exploitation attempts by detecting network connections followed by server crashes.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic to Firebird servers for unusual or malformed packets using the \u003ccode\u003eDetect Malformed Firebird Packets\u003c/code\u003e Sigma rule, particularly focusing on packets directed to port 3050.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-02T12:00:00Z","date_published":"2024-01-02T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-firebird-dos/","summary":"An unauthenticated attacker can cause a denial-of-service condition on vulnerable Firebird database servers by sending a specially crafted network packet that triggers a null pointer dereference.","title":"Firebird Database Server Denial-of-Service Vulnerability (CVE-2026-28212)","url":"https://feed.craftedsignal.io/briefs/2024-01-firebird-dos/"}],"language":"en","title":"CraftedSignal Threat Feed - Firebird","version":"https://jsonfeed.org/version/1.1"}