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CVE-2024-26230 is an elevation-of-privilege vulnerability in the Microsoft Windows Telephony Service (TapiSrv). The flaw is a use-after-free condition in the service’s handling of telephony dialog-related objects, specifically in FreeDialogInstance, which can free a GOLD object without validating that the object belongs to the calling context handle. A separate context can therefore cause an object still referenced elsewhere to be deallocated, leaving a dangling pointer. The stale pointer is later dereferenced by TUISPIDLLCallback, which performs a virtual function call on attacker-influenced data. The described exploitation technique reclaims the freed heap slot with attacker-controlled data sourced from a user-writable telephony registry value, allowing construction of a fake object and redirection of execution within the TapiSrv process.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a working exploit for CVE-2024-26230, a vulnerability in the Microsoft Windows TAPI (Tapisrv) service. The exploit is implemented in C++ and is structured as a Visual Studio project, with the main logic in 'CVE-2024-26230.cpp' and supporting code in several header and helper files. The exploit leverages crafted RPC requests to the Tapisrv service, manipulating heap memory and function pointers to achieve arbitrary DLL injection. The payload path is hardcoded as 'C:\users\kiwi\desktop\test.dll', which will be loaded into the Tapisrv process using LoadLibraryA. The exploit requires access to the Tapisrv RPC endpoint, which may be exposed via a named pipe (\\pipe\tapsrv) or over TCP/IP (e.g., 10.4.99.1). The code includes helper classes for interacting with Windows services and detailed structures for the crafted RPC messages. The exploit is marked as unstable and is intended for research purposes only. The repository does not include a detection script or Metasploit module, and the exploit is operational with a hardcoded payload.
This repository contains a local privilege escalation exploit targeting the Microsoft Windows Telephony Application Programming Service (TAPSRV) via its RPC interface. The main exploit logic resides in 'exp/exp.cpp', which orchestrates a Use-After-Free (UAF) attack by manipulating the TAPSRV RPC context and request handling. The exploit crafts specific RPC requests to create and free objects in the service, then reuses freed memory to inject a payload. The payload is a DLL (e.g., 'C:\Users\SRHla\AppData\Roaming\hack.dll') that is written into memory and loaded into the TAPSRV process using VirtualAlloc and LoadLibraryW, resulting in code execution as SYSTEM. The exploit also manipulates a registry value ('HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Telephony\HandoffPriorities\RequestMakeCall') to facilitate the attack. The repository includes MIDL-generated RPC stubs and headers for the TAPSRV interface, as well as helper code for RPC binding. The attack vector is local, requiring the attacker to execute code on the target machine. The exploit demonstrates operational maturity, providing a working payload and detailed exploitation steps.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Telephony Service (TapiSrv) elevation-of-privilege vulnerability caused by a use-after-free in FreeDialogInstance, exploitable to gain code execution and escalate privileges to SYSTEM.
A Windows Telephony Service (TapiSrv) elevation-of-privilege vulnerability caused by a use-after-free in FreeDialogInstance, exploitable to gain code execution and escalate privileges to SYSTEM.
A use-after-free vulnerability in the Microsoft Windows Telephony Service (tapisrv) RPC interface that can be triggered by manipulating context handles and freeing a GOLD object without validating ownership, leading to code execution and an XFG bypass on Windows 11.
Elevation of privilege vulnerability in Windows Telephony Server; assessed as more likely to be exploited within 30 days.
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