Microsoft Edge Chakra JIT Loop Analysis Bug

Microsoft Edge: Chakra: JIT: Loop analysis bug CVE-2018-0777 Here's the PoC demonstrating OOB write. function optarr, start, end for let i = start; i end; i++ if i === 10 i += 0; // -- a arri = 2.3023e-320; function main let arr = new Array100; arr.fill1.1; for let i = 0; i 1000; i++ optarr, 0, 3...

The vulnerability of JavaScript ChakraCore and Microsoft Edge browsers, related to improper handling of objects in memory, allows attackers to execute arbitrary code.

The vulnerability of JavaScript ChakraCore and Microsoft Edge browsers is related to improper handling of objects in memory. Exploiting this vulnerability allows a remote attacker to execute arbitrary code with the privileges of the current user...

Microsoft Edge Chakra JIT - Stack-to-Heap Copy Exploit

Exploit for windows platform in category dos / poc / If variables don't escape the scope, the variables can be allocated to the stack. However, there are some situations, such as when a bailout happens or accessing to arguments containing stack-allocated variables, where those variables should no...

Microsoft Edge Chakra - Deferred Parsing Makes Wrong Scopes (2)

Exploit for windows platform in category dos / poc / Since the PoC is only triggerable when the "DeferParse" flag enabled and requires a with statement, I think this is simillar to issue 1310 . PoC: / // Enable the flag using '\n'.repeat0x1000 evalfunction f with function printf; ; ; +...

The vulnerability of JavaScript ChakraCore and Microsoft Edge browsers, related to improper handling of objects in memory, allows attackers to obtain the privileges of the current user.

The vulnerability of the JavaScript script handler ChakraCore in the Microsoft Edge browser is related to improper handling of objects in memory. Exploiting this vulnerability can allow a malicious actor, operating remotely, to gain privileges of the current user...

Vulnerability of the JavaScript ChakraCore kernel, Internet Explorer and Microsoft Edge browsers, caused by operations beyond the buffer in memory, allowing attackers to gain control of the current user’s rights

The vulnerability in the JavaScript ChakraCore engine, as well as in browsers Internet Explorer and Microsoft Edge, arises from an operation that goes beyond the buffer boundaries in memory. Exploiting this vulnerability can allow a remote attacker to gain privileges of the current user...

Vulnerability of the JavaScript ChakraCore kernel, Internet Explorer and Microsoft Edge browsers, caused by operations beyond the buffer in memory, allowing attackers to gain control of the current user’s rights

The vulnerability in the JavaScript ChakraCore engine, as well as in browsers Internet Explorer and Microsoft Edge, arises from an operation that goes beyond the buffer boundaries in memory. Exploiting this vulnerability can allow a remote attacker to gain privileges of the current user...

Vulnerability of the JavaScript ChakraCore kernel and Microsoft Edge browsers, caused by operations beyond the buffer in memory, allowing attackers to gain control of the current user’s rights

The vulnerability of JavaScript ChakraCore and Microsoft Edge browsers arises from an operation that goes beyond the buffer boundaries in memory. Exploiting this vulnerability can allow a remote attacker to gain privileges of the current user...

Microsoft Edge Chakra - AsmJSByteCodeGenerator::EmitCall Out-of-Bounds Read

Microsoft Edge Chakra - AsmJSByteCodeGenerator::EmitCall Out-of-Bounds Read / AsmJSByteCodeGenerator::EmitCall which is used to emit call insturctions doesn't check if an array identifier is used as callee. The method handles those invalid calls in the same way it handles valid calls such as...

Microsoft Edge Chakra JIT Incorrect Bounds Calculation

Microsoft Edge: Chakra: JIT: Incorrect bounds calculation CVE-2018-0769 Let's start with comments in the "GlobOpt::TrackIntSpecializedAddSubConstant" method. // Track bounds for add or sub with a constant. For instance, consider b = a + 2. The value of 'b' should track // that it is equal to the...

Microsoft Edge Chakra Incorrect Scope Handling

Microsoft Edge: Chakra: Incorrect scope handling CVE-2018-0774 PoC: function funcarg = function printfunc; // SetHasOwnLocalInClosure should be called for the param scope in the PostVisitFunction function. printfunc; function func ; Chakra fails to distinguish whether the function is referenced i...

Microsoft Edge Chakra - 'JavascriptGeneratorFunction::GetPropertyBuiltIns' Type Confusion

/ Here's a snippet of the method. bool JavascriptGeneratorFunction::GetPropertyBuiltInsVar originalInstance, PropertyId propertyId, Var value, PropertyValueInfo info, ScriptContext requestContext, BOOL result if propertyId == PropertyIds::length ... int len = 0; Var varLength; if...

Microsoft Edge Chakra JIT - Stack-to-Heap Copy

Microsoft Edge Chakra JIT - Stack-to-Heap Copy / If variables don't escape the scope, the variables can be allocated to the stack. However, there are some situations, such as when a bailout happens or accessing to arguments containing stack-allocated variables, where those variables should not...

Microsoft Edge Chakra JIT - Out-of-Bounds Write

Microsoft Edge Chakra JIT - Out-of-Bounds Write // Here's the PoC demonstrating OOB write. function optarr, start, end for let i = start; i end; i++ if i === 10 i += 0; // -- a arri = 2.3023e-320; function main let arr = new Array100; arr.fill1.1; for let i = 0; i 1000; i++ optarr, 0, 3; optarr, ...

Microsoft Edge Chakra - Incorrect Scope Handling

Microsoft Edge Chakra - Incorrect Scope Handling // PoC: function funcarg = function printfunc; // SetHasOwnLocalInClosure should be called for the param scope in the PostVisitFunction function. printfunc; function func ; // Chakra fails to distinguish whether the function is referenced in the...

Microsoft Edge Chakra - 'AsmJSByteCodeGenerator::EmitCall' Out-of-Bounds Read

/ AsmJSByteCodeGenerator::EmitCall which is used to emit call insturctions doesn't check if an array identifier is used as callee. The method handles those invalid calls in the same way it handles valid calls such as "arridx & ...". In these cases, the index register remains NoRegister which is...

Microsoft Edge Chakra - Deferred Parsing Makes Wrong Scopes (2)

/ Since the PoC is only triggerable when the "DeferParse" flag enabled and requires a with statement, I think this is simillar to issue 1310 . PoC: / // Enable the flag using '\n'.repeat0x1000 evalfunction f with function printf; ; ; + '\n'.repeat0x1000; PoC 2: // ./ch poc.js -ForceDeferParse...

Microsoft Edge Chakra - JavascriptGeneratorFunction::GetPropertyBuiltIns Type Confusion

Microsoft Edge Chakra - JavascriptGeneratorFunction::GetPropertyBuiltIns Type Confusion / Here's a snippet of the method. bool JavascriptGeneratorFunction::GetPropertyBuiltInsVar originalInstance, PropertyId propertyId, Var value, PropertyValueInfo info, ScriptContext requestContext, BOOL result ...

Microsoft Edge Chakra - Deferred Parsing Makes Wrong Scopes (2)

Microsoft Edge Chakra - Deferred Parsing Makes Wrong Scopes 2 / Since the PoC is only triggerable when the "DeferParse" flag enabled and requires a with statement, I think this is simillar to issue 1310 . PoC: / // Enable the flag using '\n'.repeat0x1000 evalfunction f with function printf; ; ; +...

Microsoft Edge Chakra JavascriptGeneratorFunction::GetPropertyBuiltIns Exposure

Microsoft Edge: Chakra: JavascriptGeneratorFunction::GetPropertyBuiltIns exposes scriptFunction CVE-2017-11914 Here's a snippet of the method. bool JavascriptGeneratorFunction::GetPropertyBuiltInsVar originalInstance, PropertyId propertyId, Var value, PropertyValueInfo info, ScriptContext...