| 제목 | Jiangmin Jiangmin Antivirus V21 Exposed Minifilter Port with Insufficient Access Control |
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| 설명 | The Jiangmin Antivirus kernel driver, kvcore.sys exposes a minifilter communication port ("\KvCorePortX0") that accepts command messages from user-mode processes. The driver's MessageNotifyCallback (FUN_140008c60) dispatches a command code (0x1D / CMD_TERMINATE_PROCESS) to the internal function FUN_14000cf14, which terminates an arbitrary process specified by PID using the following kernel API chain:
1. PsLookupProcessByProcessId(PID)
2. ObOpenObjectByPointer(PROCESS_TERMINATE)
3. ZwTerminateProcess(handle, 0)
The vulnerability exists because in FUN_14000688c, the filter communication port is created using FltBuildDefaultSecurityDescriptor() with an overly permissive access mask (0x1F0001), granting connection rights to EVERYONE (S-1-1-0). This allows any user-mode process to connect.
When a user-mode process sends a message to the KvCorePortX0 minifilter, the MessageNotifyCallback callback function (at FUN_140008c60) performs no caller authentication. There are no calls to SeSinglePrivilegeCheck(), PsGetCurrentProcess() validation, token verification, or any process allowlist check. |
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| 원천 | ⚠️ https://github.com/patrickt2017/research/issues/1 |
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| 사용자 | patrickt2017 (UID 97401) |
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| 제출 | 2026. 06. 20. PM 07:30 (2 개월 ago) |
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| 모더레이션 | 2026. 08. 06. PM 10:06 (2 months later) |
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| 상태 | 수락 |
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| VulDB 항목 | 386711 [Jiangmin Antivirus 21 Minifilter Port kvcore.sys MessageNotifyCallback 권한 상승] |
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| 포인트들 | 20 |
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