{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/tvicport64.sys/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["TVicPort64.sys"],"_cs_severities":["high"],"_cs_tags":["lpe","byovd","tvicport64.sys","privilege-escalation","signed-driver"],"_cs_type":"advisory","_cs_vendors":["EnTech Taiwan"],"content_html":"\u003cp\u003eThe TVicPort64.sys driver, originating from EnTech Taiwan around 2006, is a signed but vulnerable driver that allows for arbitrary physical memory mapping. This vulnerability enables a local user to escalate privileges to SYSTEM by exploiting the driver's ability to directly access and modify physical memory. The driver's age and the fact that it's signed make it a potential candidate for Bring Your Own Vulnerable Driver (BYOVD) attacks. This poses a significant risk to Windows systems as it allows attackers to bypass security measures and gain elevated privileges, potentially leading to complete system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to the target Windows system with standard user privileges.\u003c/li\u003e\n\u003cli\u003eAttacker drops the vulnerable TVicPort64.sys driver onto the system.\u003c/li\u003e\n\u003cli\u003eAttacker loads the TVicPort64.sys driver into the kernel, likely exploiting a known method for driver loading, potentially bypassing driver signature enforcement.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the driver's IOCTLs (Input/Output Control codes) to map arbitrary physical memory into the user-mode address space.\u003c/li\u003e\n\u003cli\u003eAttacker identifies sensitive kernel data structures or code within the mapped physical memory.\u003c/li\u003e\n\u003cli\u003eAttacker modifies the identified kernel data structures or code to gain elevated privileges, such as adding the user account to the local Administrators group.\u003c/li\u003e\n\u003cli\u003eThe attacker executes a command or process that requires elevated privileges.\u003c/li\u003e\n\u003cli\u003eThe attacker now operates with SYSTEM-level privileges, allowing them to perform any action on the system, including installing malware, accessing sensitive data, or creating new accounts.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of the TVicPort64.sys vulnerability allows an attacker to achieve local privilege escalation, granting them SYSTEM-level access on the targeted Windows system. This can lead to complete system compromise, allowing the attacker to install malware, steal sensitive data, create new administrative accounts, and perform other malicious activities. The impact is significant, especially in environments where least privilege principles are not strictly enforced.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor for the presence of the TVicPort64.sys driver on systems using file integrity monitoring rules (see file_event log source).\u003c/li\u003e\n\u003cli\u003eImplement driver blocklisting to prevent the TVicPort64.sys driver from being loaded into the kernel.\u003c/li\u003e\n\u003cli\u003eEnable and review Driver Signature Enforcement logs to identify attempts to load unsigned or improperly signed drivers.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule to detect the presence of TVicPort64.sys being loaded as a driver (see process_creation log source).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-05-02T12:00:00Z","date_published":"2024-05-02T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-05-tvicport-lpe/","summary":"The TVicPort64.sys driver, signed by EnTech Taiwan in 2006, is vulnerable to arbitrary physical memory mapping, enabling local privilege escalation on Windows systems.","title":"TVicPort64.sys Arbitrary Physical Memory Mapping LPE","url":"https://feed.craftedsignal.io/briefs/2024-05-tvicport-lpe/"}],"language":"en","title":"CraftedSignal Threat Feed - Tvicport64.sys","version":"https://jsonfeed.org/version/1.1"}