Microsoft Edge Chakra JIT - GlobOpt::OptTagChecks Must Consider IsLoopPrePass Properly

Microsoft Edge Chakra JIT - GlobOpt::OptTagChecks Must Consider IsLoopPrePass Properly / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1365 Some background: https://bugs.chromium.org/p/project-zero/issues/detail?id=1364 There's one more place that emits a BailOnNotObject opcod...

Microsoft Edge Chakra JIT Incorrect Function Declaration Scope Exploit

Exploit for windows platform in category dos / poc Microsoft Edge: Chakra: JIT: Incorrect function declaration scope CVE-2017-11870 In the following JavaScript code, both of the print calls must print out "undefined" because of "x" is a formal parameter. But the second print call prints out...

Microsoft Edge Chakra JIT Inline::InlineCallApplyTarget_Shared Failed Return Exploit

Exploit for windows platform in category dos / poc Microsoft Edge: Chakra: JIT: Inline::InlineCallApplyTargetShared doesn't return the return instruction CVE-2017-11841 Here's a snippet of Inline::Optimize. FOREACHINSTREDITINGinstr, instrNext, func-mheadInstr switch instr-mopcode case...

Microsoft Edge Chakra JIT BailOutOnTaggedValue Bailouts Exploit

Exploit for windows platform in category dos / poc Microsoft Edge: Chakra: JIT: BailOutOnTaggedValue bailouts can be generated for constant values CVE-2017-11839 1. In the Chakra's JIT compilation process, it stores variables' type information by basic block. function optb let o; if b // BASIC...

Microsoft Edge Chakra JIT GlobOpt::OptTagChecks Property Consideration Exploit

Exploit for windows platform in category dos / poc Microsoft Edge: Chakra: JIT: GlobOpt::OptTagChecks must consider IsLoopPrePass properly CVE-2017-11840 Some background: https://bugs.chromium.org/p/project-zero/issues/detail?id=1364 There's one more place that emits a BailOnNotObject opcode...

Microsoft Edge Chakra JIT Incorrect Function Declaration Scope

Microsoft Edge: Chakra: JIT: Incorrect function declaration scope CVE-2017-11870 In the following JavaScript code, both of the print calls must print out "undefined" because of "x" is a formal parameter. But the second print call prints out "function x ". This bug may lead to type confusion in...

Microsoft Edge Chakra JIT Inline::InlineCallApplyTarget_Shared Failed Return

Microsoft Edge: Chakra: JIT: Inline::InlineCallApplyTargetShared doesn't return the return instruction CVE-2017-11841 Here's a snippet of Inline::Optimize. FOREACHINSTREDITINGinstr, instrNext, func-mheadInstr switch instr-mopcode case Js::OpCode::Label: ... if instr-AsLabelInstr-misForInExit...

Microsoft Edge Chakra JIT BailOutOnTaggedValue Bailouts

Microsoft Edge: Chakra: JIT: BailOutOnTaggedValue bailouts can be generated for constant values CVE-2017-11839 1. In the Chakra's JIT compilation process, it stores variables' type information by basic block. function optb let o; if b // BASIC BLOCK a o = ; else // BASIC BLOCK b o = 1.1; // BASIC...

Microsoft Edge Chakra JIT GlobOpt::OptTagChecks Property Consideration

Microsoft Edge: Chakra: JIT: GlobOpt::OptTagChecks must consider IsLoopPrePass properly CVE-2017-11840 Some background: https://bugs.chromium.org/p/project-zero/issues/detail?id=1364 There's one more place that emits a BailOnNotObject opcode. Here's a snippet of GlobOpt::OptTagChecks. if...

Microsoft Edge Chakra JIT - Lowerer::LowerBoundCheck Incorrect Integer Overflow Check Exploit

Exploit for windows platform in category dos / poc / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1343 Here's a snippet of the method. void Lowerer::LowerBoundCheckIR::Instr const instr ... ifrightOpnd-IsIntConstOpnd IntConstType newOffset; if!IntConstMath::Addoffset,...

Microsoft Edge Chakra JIT Bailout Generation

Microsoft Edge: Chakra: JIT: Bailouts must be generated for OPMemset CVE-2017-11873 function opta, b, v if b.length b0 = ; return 0; ; printb0; main; This bug is subject to a 90 day disclosure deadline. After 90 days elapse or a patch has been made broadly available, the bug report will become...

Microsoft Edge Chakra JIT - Type Confusion with switch Statements

Microsoft Edge Chakra JIT - Type Confusion with switch Statements / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1341&desc=3 Let's start with a switch statement and its IR code for JIT. JS: for let i = 0; i ; 100; i++ switch i case 2: case 4: case 6: case 8: case 10: case 12:...

Microsoft Edge: Chakra: JIT: Bailouts must be generated for OP_Memset(CVE-2017-11873)

function opta, b, v if b.length b0 = ; return 0; ; printb0; main;...

Microsoft Edge Chakra JIT - Type Confusion with switch Statements Exploit

Exploit for windows platform in category dos / poc / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1341&desc=3 Let's start with a switch statement and its IR code for JIT. JS: for let i = 0; i ; 100; i++ switch i case 2: case 4: case 6: case 8: case 10: case 12: case 14: case...

Microsoft Edge Chakra: JIT - OP_Memset Type Confusion

Microsoft Edge Chakra: JIT - OPMemset Type Confusion / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1357 function opta, b, v if b.length b0 = ; return 0; ; printb0; main;...

Microsoft Edge: Chakra: JIT: Incorrect integer overflow check in Lowerer::LowerBoundCheck(CVE-2017-11861)

Here's a snippet of the method. void Lowerer::LowerBoundCheckIR::Instr const instr ... ifrightOpnd-IsIntConstOpnd IntConstType newOffset; if!IntConstMath::Addoffset, rightOpnd-AsIntConstOpnd-GetValue, &newOffset --- a offset = newOffset; rightOpnd = nullptr; offsetOpnd = nullptr; ... if!rightOpnd...

Microsoft Edge Charka JIT Incorrect Check

Microsoft Edge: Chakra: JIT: Incorrect integer overflow check in Lowerer::LowerBoundCheck CVE-2017-11861 Here's a snippet of the method. void Lowerer::LowerBoundCheckIR::Instr const instr ... ifrightOpnd-IsIntConstOpnd IntConstType newOffset; if!IntConstMath::Addoffset,...

Microsoft Edge: Chakra: JIT: Type confusion with switch statements(CVE-2017-11811)

Let's start with a switch statement and its IR code for JIT. JS: for let i = 0; i ; 100; i++ switch i case 2: case 4: case 6: case 8: case 10: case 12: case 14: case 16: case 18: case 20: case 22: case 24: case 26: case 28: case 30: case 32: case 34: case 36: case 38: break; IRs before Type...

Microsoft Edge Chakra JIT Type Confusion

Microsoft Edge: Chakra: JIT: Type confusion with switch statements CVE-2017-11811 Let's start with a switch statement and its IR code for JIT. JS: for let i = 0; i 100; i++ switch i case 2: case 4: case 6: case 8: case 10: case 12: case 14: case 16: case 18: case 20: case 22: case 24: case 26: ca...

Microsoft Edge Chakra: JIT - 'Lowerer::LowerBoundCheck' Incorrect Integer Overflow Check

/ Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1343 Here's a snippet of the method. void Lowerer::LowerBoundCheckIR::Instr const instr ... ifrightOpnd-IsIntConstOpnd IntConstType newOffset; if!IntConstMath::Addoffset, rightOpnd-AsIntConstOpnd-GetValue, &newOffset --- a offset...