Microsoft Edge Chakra EmitAssignment Register Issue Exploit

Microsoft Edge Chakra has an issue where EmitAssignment uses the "this" register without initializing. Microsoft Edge: Chakra: EmitAssignment uses the "this" register without initializing "EmitAssignment" doesn't call "EmitSuperMethodBegin" that initializes the "this" register for the case when t...

Microsoft Edge Chakra - EmitNew Integer Overflow

Microsoft Edge Chakra - EmitNew Integer Overflow sxCall.argCount; argCount++; // include "this" BOOL fSideEffectArgs = FALSE; unsigned int tmpCount = CountArgumentspnode-sxCall.pnodeArgs, &fSideEffectArgs; AssertargCount == tmpCount; if argCount != Js::ArgSlotargCount Js::Throw::OutOfMemory;...

Microsoft Edge Chakra - chakra!Js::GlobalObject Integer overflow

Microsoft Edge Chakra - chakra!Js::GlobalObject Integer overflow = 0; AnalysisAssertscriptContext; if scriptContext-GetThreadContext-EvalDisabled throw Js::EvalDisabledException; ifdef PROFILEEXEC scriptContext-ProfileBeginJs::EvalCompilePhase; endif void frameAddr = nullptr;...

Microsoft Edge Chakra - Uninitialized Arguments (1)

Microsoft Edge Chakra - Uninitialized Arguments 1 ParseNodePtr Parser::ParseVariableDeclaration tokens declarationType, charcountt ichMin, BOOL fAllowIn/ = TRUE/, BOOL pfForInOk/ = nullptr/, BOOL singleDefOnly/ = FALSE/, BOOL allowInit/ = TRUE/, BOOL isTopVarParse/ = TRUE/, BOOL isFor/ = FALSE/,...

Microsoft Edge Chakra - JavascriptArray::ConcatArgs Type Confusion

Microsoft Edge Chakra - JavascriptArray::ConcatArgs Type Confusion void JavascriptArray::ConcatArgsRecyclableObject pDestObj, TypeId remoteTypeIds, Js::Arguments& args, ScriptContext scriptContext, uint start, uint startIdxDest, BOOL firstPromotedItemIsSpreadable, BigIndex firstPromotedItemLength...

Microsoft Edge Chakra - PreVisitCatch Missing Call

Microsoft Edge Chakra - PreVisitCatch Missing Call root-sxFnc.pnodeVars; pnode; pnode = pnode-sxVar.pnodeNext Symbol sym = pnode-sxVar.sym; if sym != nullptr && !pnode-sxVar.isBlockScopeFncDeclVar && sym-GetIsBlockVar if sym-GetIsCatch || pnode-nop == knopVarDecl && sym-GetIsBlockVar ... sym =...

Microsoft Edge - Out-of-Bounds Access when Fetching Source

Microsoft Edge - Out-of-Bounds Access when Fetching Source // The attached JavaScript file causes an out-of-bounds access of the source buffer when fetching the source for one of the functions during delayed compilation. The out-of-bounds value is then treated as the pointer to the source. This i...

Microsoft Edge Chakra JavascriptFunction::EntryCall Mishandled CallInfo

Microsoft Edge: Chakra: JavascriptFunction::EntryCall doesn't handle CallInfo properly CVE-2017-8671 Here's the method. Var JavascriptFunction::EntryCallRecyclableObject function, CallInfo callInfo, ... PROBESTACKfunction-GetScriptContext, Js::Constants::MinStackDefault; RUNTIMEARGUMENTSargs,...

Microsoft Edge Chakra TryUndeleteProperty Incorrect Usage Exploit

Microsoft Edge Chakra suffers from an incorrect usage of TryUndeleteProperty. Microsoft Edge: Chakra: Incorrect usage of TryUndeleteProperty CVE-2017-8635 Chakra implemented the reuse of deleted properties of an unordered dictionary object with the following code. bool...

Microsoft Edge Chakra Uninitialized Arguments Exploit

Microsoft Edge Chakra suffers from an uninitialized arguments vulnerability. Microsoft Edge: Chakra: Uninitialized arguments CVE-2017-8640 Here's a snippet of "ParseVariableDeclaration" which is used for parsing declarations. template ParseNodePtr Parser::ParseVariableDeclaration tokens...

Microsoft Edge Security Bypass Vulnerability(CVE-2017-8637)

There is an issue in Chakra JIT server that can be potentially exploited to compromise the JIT process from a compromised browser content process. Bugs like this could potentially be used to bypass ACG Arbitrary Code Guard in Microsoft Edge. The issue has been confirmed on a ChakraCore build from...

Microsoft Edge: Chakra: Uninitialized arguments 2(CVE-2017-8670)

Similar to the issue 1297 . But this time, it happends in "Parser::ParseFncFormals" with the "PNodeFlags::fpnArgumentsoverriddenInParam" flag. template void Parser::ParseFncFormalsParseNodePtr pnodeFnc, ParseNodePtr pnodeParentFnc, ushort flags ... if IsES6DestructuringEnabled &&...

Microsoft Edge: Chakra: Type confusion in JavascriptArray::ConcatArgs(CVE-2017-8634)

Let's assume that the following method is called with "firstPromotedItemIsSpreadable = true", and "args" has two elements an array and an integer 0x1234 sequentially. In the first loop, "aItem" is an array, and "firstPromotedItemIsSpreadable" remains true because the condition for the fast path i...

Microsoft Edge: Out-of-bounds read in CInputDateTimeScrollerElement::_SelectValueInternal(CVE-2017-8644)

The vulnerability has been confirmed on Windows 10 Enterprise 64-bit OS version 1607, OS build 14393.1198 and Microsoft Edge 38.14393.1066.0, Microsoft EdgeHTML 14.14393. PoC: ========================================== input:focus transform: scale10; =========================================...

Microsoft Edge: Chakra: InterpreterStackFrame::ProcessLinkFailedAsmJsModule incorrectly re-parses(CVE-2017-8645)

When Chakra fails to link an asmjs module, it tries to re-parse the failed-to-link asmjs function to treat it as a normal javascript function. But it incorrectly handles the case where the function is a class. It starts to parse from the start of the class declaration instead of the constructor. ...

Microsoft Edge Chakra Parser::ParseFncFormals Uninitialized Arguments Exploit

Microsoft Edge Chakra suffers from an uninitialized arguments vulnerability in Parser::ParseFncFormals with the "PNodeFlags::fpnArgumentsoverriddenInParam" flag. Microsoft Edge: Chakra: Uninitialized arguments 2 CVE-2017-8670 Similar to the issue 1297 . But this time, it happends in...

Microsoft Edge Scripting Engine Information Disclosure Vulnerability(CVE-2017-8659)

There is an issue in Chakra JIT server that can be potentially exploited to compromise the JIT process from a compromised browser content process. Bugs like this could potentially be used to bypass ACG Arbitrary Code Guard in Microsoft Edge. The issue has been confirmed on a ChakraCore build from...

Microsoft Edge: Chakra: incorrect jit optimization with TypedArray setter #2(CVE-2017-8548)

I think the fix for 1045 is incorrect. Here's the original PoC. 'use strict'; function funca, b, c a0 = 1.2; b0 = c; a1 = 2.2; a0 = 2.3023e-320; function main var a = 1.1, 2.2; var b = new Uint32Array100; // force to optimize for var i = 0; i a0 = ; return 0; ; a0.toString; main; I just changed...

Microsoft Edge Chakra Incorrect Jit Optimization Exploit

Yet another finding that the fix for an incorrect jit optimization with TypedArray setter in Microsoft Edge Chakra may not be sufficient. Microsoft Edge: Chakra: incorrect jit optimization with TypedArray setter 3 CVE-2017-8601 Coincidentally, Microsoft released the patch for the issue 1290 the d...

Microsoft Edge Chakra - NULL Pointer Dereference

Microsoft Edge Chakra - NULL Pointer Dereference spreadIndices = nullptr // This function emits the arguments for a call. // ArgOut's with uses immediately following defs. EmitArgListStartthisLocation, byteCodeGenerator, funcInfo, callSiteId; Js::RegSlot evalLocation = Js::Constants::NoRegister; ...