# Exploit Title: Kernel stack buffer overflow ATool - 1.0.0.22 (0day) # CVE: CVE-2018-19650 # Date: 28-11-2018 # Software Link: http://www.antiy.net/ <http://www.antiy.net/ # Exploit Author: Aloyce J. Makalanga # Contact: https://twitter.com/aloycemjr <https://twitter.com/aloycemjr> # Vendor Homepage: http://www.antiy.net/ <http://www.antiy.net/ # Category: Windows # Attack Type: local # Impact:Code execution/Denial of Service/Escalation of Privileges 1. Description Local attackers can trigger a stack-based buffer overflow on vulnerable installations of Antiy-AVL IATool security management v1.0.0.22. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the processing of IOCTL 0x80002000 by the IRPFile.sys Antiy-AVL IATool kernel driver. The bug is caused by failure to properly validate the length of the user-supplied data, which results in a kernel stack buffer overflow. An attacker can leverage this vulnerability to execute arbitrary code in the context of the kernel, which could lead to privilege escalation and a failed exploit could lead to denial of service 2. Proof of Concept ** Fatal System Error: 0x000000f7 (0x00000000,0x00000000,0x00000000,0x00000000) Break instruction exception - code 80000003 (first chance) A fatal system error has occurred. Debugger entered on first try; Bugcheck callbacks have not been invoked. A fatal system error has occurred. ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* Use !analyze -v to get detailed debugging information. BugCheck F7, {0, 0, 0, 0} 0: kd!analyze -v ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* DRIVER_OVERRAN_STACK_BUFFER (f7) A driver has overrun a stack-based buffer. This overrun could potentially allow a malicious user to gain control of this machine. DESCRIPTION A driver overran a stack-based buffer (or local variable) in a way that would have overwritten the function's return address and jumped back to an arbitrary address when the function returned. This is the classic "buffer overrun" hacking attack and the system has been brought down to prevent a malicious user from gaining complete control of it. Do a kb to get a stack backtrace -- the last routine on the stack before the buffer overrun handlers and bugcheck call is the one that overran its local variable(s). Arguments: Arg1: 00000000, Actual security check cookie from the stack Arg2: 00000000, Expected security check cookie Arg3: 00000000, Complement of the expected security check cookie Arg4: 00000000, zero Debugging Details: ------------------ ..snip... SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\IRPFile.sys - path not found SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\IRPFile.sy_ - path not found SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\file.ptr - path not found SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/IRPFile.sys SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/IRPFile.sy_ SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/file.ptr SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: RESULT: 0x80190194 SYMSRV: BYINDEX: 0x19 c:\mss*http://msdl.microsoft.com/download/symbols <http://msdl.microsoft.com/download/symbols> IRPFile.sys 488458088000 <tel:488458088000> SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\IRPFile.sys - path not found SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\IRPFile.sy_ - path not found SYMSRV: UNC: c:\mss\IRPFile.sys\488458088000\file.ptr - path not found SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/IRPFile.sys SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/IRPFile.sy_ SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET: /download/symbols/IRPFile.sys/488458088000/file.ptr SYMSRV: HttpQueryInfo: 80190194 - HTTP_STATUS_NOT_FOUND SYMSRV: RESULT: 0x80190194 ...snip... STACK_TEXT: 8f7d04fc 82af5083 00000003 af12dd69 00000065 nt!RtlpBreakWithStatusInstruction 8f7d054c 82af5b81 00000003 8f7d0b15 874a2a05 nt!KiBugCheckDebugBreak+0x1c 8f7d0910 82af4f20 000000f7 00000000 00000000 <tel:00000000%2000000000nt!KeBugCheck2+0x68b 8f7d0930 96187807 000000f7 00000000 00000000 <tel:00000000%2000000000nt!KeBugCheckEx+0x1e WARNING: Stack unwind information not available. Following frames may be wrong. 8f7d0b14 82c4199f 874a2a80 87753d88 87753df8 IRPFile+0x1807 ..snip.. 003afba8 770e37f5 7ffdf000 772e46c0 00000000 kernel32!BaseThreadInitThunk+0xe 003afbe8 770e37c8 1c6113a4 7ffdf000 00000000 ntdll!__RtlUserThreadStart+0x70 003afc00 00000000 1c6113a4 7ffdf000 00000000 ntdll!_RtlUserThreadStart+0x1b THREAD_SHA1_HASH_MOD_FUNC: e0510aa415746c9a78568dbc25f2ae05829414f7 THREAD_SHA1_HASH_MOD_FUNC_OFFSET: cba5c81684013091d113a710f0d0512cbfe72fe3 THREAD_SHA1_HASH_MOD: 193e9dae344f68597c220997816646d6a31bcd0f FOLLOWUP_IP: IRPFile+1807 96187807 cc int 3 FAULT_INSTR_CODE: d3bcc SYMBOL_STACK_INDEX: 4 SYMBOL_NAME: IRPFile+1807 FOLLOWUP_NAME: MachineOwner MODULE_NAME: IRPFile IMAGE_NAME: IRPFile.sys ...snip... FAILURE_ID_HASH_STRING: km:0xf7_missing_gsframe_irpfile+1807 FAILURE_ID_HASH: {9c4ca7bc-8950-996e-25be-b021c1c0c08a} Followup: MachineOwner 3. Solution: None