Microsoft Edge: Chakra: JIT: Inline::InlineCallApplyTarget_Shared 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 Assertthis-currentForInDepth != 0; // The PoC hits this this-currentForInDepth--; break; case...

Microsoft Edge Scripting Engine Memory Corruption (CVE-2017-11839)

A remote code execution Vulnerability exists in Microsoft Edge. The vulnerability is due to the way JavaScript engine renders when handling objects in memory. A remote unauthenticated attacker could exploit this vulnerability by enticing the target user to open a specially crafted web page...

Microsoft Edge Scripting Engine Memory Corruption (CVE-2017-11870)

A remote code execution vulnerability exists in Microsoft Edge. The vulnerability is due to the way the scripting engine handles objects in memory. A remote unauthenticated attacker could exploit this vulnerability by enticing the target user to open a specially crafted web page...

Microsoft Edge Memory Corruption Arbitrary Code Execution (CVE-2017-8751)

A remote code execution vulnerability exists in Microsoft Edge. The vulnerability is due to the way Microsoft Edge handles objects in memory. A remote attacker can exploit this issue by enticing a target victim to open a specially crafted web page...

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 opcode. Here's a snippet of GlobOpt::OptTagChecks. if valueType.CanBeTaggedValue &&...

Microsoft Edge Chakra JIT - Inline::InlineCallApplyTarget_Shared does not Return the return Instruction

Microsoft Edge Chakra JIT - Inline::InlineCallApplyTargetShared does not Return the return Instruction / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1366 Here's a snippet of Inline::Optimize. FOREACHINSTREDITINGinstr, instrNext, func-mheadInstr switch instr-mopcode case...

Microsoft Edge Chakra JIT - Incorrect Function Declaration Scope

/ Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1367 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 JITed code...

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

Microsoft Edge Chakra JIT - Incorrect Function Declaration Scope / Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1367 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 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 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 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 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 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 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...

TippingPoint Threat Intelligence and Zero-Day Coverage – Week of November 13, 2017

The dreaded white, blank screen in Microsoft Word is taunting me, with its blinking cursor asking for words to be written. Just when I thought I wouldn’t get any inspiration for this week’s blog, inspiration came to me from beyond through our late CTO Raimund Genes. Earlier this week, the third...

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 - 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 - Lowerer::LowerBoundCheck Incorrect Integer Overflow Check

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;...