CVE-2019-8674

A logic issue was addressed with improved state management. This issue is fixed in iOS 13, Safari 13. Processing maliciously crafted web content may lead to universal cross site scripting...

JSC Argument Object Reconstruction Type Confusion

JSC: Type confusion during bailout when reconstructing arguments objects The following sample was found by Fuzzilli and then slightly modified. It crashes JSC in debug builds: function main const v2 = 1337,1337; const v3 = 1337,v2,v2,0; Object.proto = v3; for let v10 = 0; v10...

jsc: Stack-buffer-underflow in JSC::Register::pointer

Detailed Report: https://oss-fuzz.com/testcase?key=5763160024023040 Project: jsc Fuzzer: jsfuzzer Job Type: asanjsc Platform Id: linux Crash Type: Stack-buffer-underflow READ 8 Crash Address: 0x7ffcb1a355c8 Crash State: JSC::Register::pointer JSC::CallFrame::callee...

Webkit JSC: JIT - Uninitialized Variable Access in ArgumentsEliminationPhase::transform Exploit

https://github.com/WebKit/webkit/blob/94e868c940d46c5745869192d07255331d00102b/Source/JavaScriptCore/dfg/DFGArgumentsEliminationPhase.cppL743 case GetByVal: ... unsigned numberOfArgumentsToSkip = 0; if candidate-op == PhantomCreateRest numberOfArgumentsToSkip = candidate-numberOfArgumentsToSkip;...

Webkit JSC JIT ArgumentsEliminationPhase::transform Uninitialized Variable Access

https://github.com/WebKit/webkit/blob/94e868c940d46c5745869192d07255331d00102b/Source/JavaScriptCore/dfg/DFGArgumentsEliminationPhase.cppL743 case GetByVal: ... unsigned numberOfArgumentsToSkip = 0; if candidate-op == PhantomCreateRest numberOfArgumentsToSkip = candidate-numberOfArgumentsToSkip;...

Webkit JSC: JIT - Uninitialized Variable Access in ArgumentsEliminationPhase::transform

Webkit JSC: JIT - Uninitialized Variable Access in ArgumentsEliminationPhase::transform https://github.com/WebKit/webkit/blob/94e868c940d46c5745869192d07255331d00102b/Source/JavaScriptCore/dfg/DFGArgumentsEliminationPhase.cppL743 case GetByVal: ... unsigned numberOfArgumentsToSkip = 0; if...

Webkit JSC: JIT - Uninitialized Variable Access in ArgumentsEliminationPhase::transform

https://github.com/WebKit/webkit/blob/94e868c940d46c5745869192d07255331d00102b/Source/JavaScriptCore/dfg/DFGArgumentsEliminationPhase.cppL743 case GetByVal: ... unsigned numberOfArgumentsToSkip = 0; if candidate-op == PhantomCreateRest numberOfArgumentsToSkip = candidate-numberOfArgumentsToSkip;...

JSC BytecodeGenerator::emitEqualityOpImpl Data Mishandling

JSC: A bug in BytecodeGenerator::emitEqualityOpImpl Related CVE Numbers: CVE-2019-8684. PoC: let a = 1 || typeof 1 === 'string'; Generated bytecode: BPmgTo:0x7ff1965a0000-0x7ff1965a8000, NoneGlobal, 37: 11 instructions 0 wide instructions, 2 instructions with metadata; 225 bytes 188 metadata byte...

macOS / iOS JavaScriptCore - JSValue Use-After-Free in ValueProfiles Exploit

macOS / iOS JavaScriptCore - JSValue Use-After-Free in ValueProfiles Exploit While fuzzing JSC, I encountered the following JS program which crashes JSC from current HEAD and release /System/Library/Frameworks/JavaScriptCore.framework/Resources/jsc: // Run with --useConcurrentJIT=false...

jsc: Crash in jsc

Detailed report: https://oss-fuzz.com/testcase?key=4816702556078080 Project: jsc Job Type: asanjsc Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0xfffffffffffffff0 Crash State: jsc jsc jsc Sanitizer: address ASAN Regressed:...

CVE-2019-11070

WebKitGTK and WPE WebKit prior to version 2.24.1 failed to properly apply configured HTTP proxy settings when downloading livestream video HLS, DASH, or Smooth Streaming, an error resulting in deanonymization. This issue was corrected by changing the way livestreams are downloaded...

WebKit JSC - reifyStaticProperty Needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter

WebKit JSC - reifyStaticProperty Needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter / https://github.com/WebKit/webkit/blob/3fff8c40c665a09de5e3ede46fc35908f69353c3/Source/JavaScriptCore/runtime/Lookup.hL392 if value.attributes & PropertyAttribute::PropertyCallback...

WebKit JSC - reifyStaticProperty Needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter

/ https://github.com/WebKit/webkit/blob/3fff8c40c665a09de5e3ede46fc35908f69353c3/Source/JavaScriptCore/runtime/Lookup.hL392 if value.attributes & PropertyAttribute::PropertyCallback JSValue result = value.lazyPropertyCallbackvm, &thisObj; thisObj.putDirectvm, propertyName, result,...

WebKit JSC reifyStaticProperty Attribute Flag Issue

WebKit: JSC: reifyStaticProperty needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter CVE-2019-6215 https://github.com/WebKit/webkit/blob/3fff8c40c665a09de5e3ede46fc35908f69353c3/Source/JavaScriptCore/runtime/Lookup.hL392 if value.attributes &...

WebKit JSC reifyStaticProperty Attribute Flag Issue Exploit

WebKit JSC has an issue where reifyStaticProperty needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter. WebKit: JSC: reifyStaticProperty needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter CVE-2019-6215...

WebKit JSC JIT - GetIndexedPropertyStorage Use-After-Free Exploit

/ The doesGC function simply takes a node, and tells if it might cause a garbage collection. This function is used to determine whether to insert write barriers. But it's missing GetIndexedPropertyStorage that can cause a garbage collection via rope strings. As a result, it can lead to UaF. PoC: ...

WebKit JSC JIT - GetIndexedPropertyStorage Use-After-Free

WebKit JSC JIT - GetIndexedPropertyStorage Use-After-Free / The doesGC function simply takes a node, and tells if it might cause a garbage collection. This function is used to determine whether to insert write barriers. But it's missing GetIndexedPropertyStorage that can cause a garbage collectio...

WebKit JSC JIT Use-After-Free

WebKit: JSC: JIT: GetIndexedPropertyStorage can GC CVE-2018-4442 The doesGC function simply takes a node, and tells if it might cause a garbage collection. This function is used to determine whether to insert write barriers. But it's missing some cases such as StringCharAt, StringCharCodeAt and...

WebKit JSC JIT - GetIndexedPropertyStorage Use-After-Free

/ The doesGC function simply takes a node, and tells if it might cause a garbage collection. This function is used to determine whether to insert write barriers. But it's missing GetIndexedPropertyStorage that can cause a garbage collection via rope strings. As a result, it can lead to UaF. PoC: ...

WebKit JSC - JSArray::shiftCountWithArrayStorage Out-of-Bounds ReadWrite

WebKit JSC - JSArray::shiftCountWithArrayStorage Out-of-Bounds ReadWrite / bool JSArray::shiftCountWithArrayStorageVM& vm, unsigned startIndex, unsigned count, ArrayStorage storage unsigned oldLength = storage-length; RELEASEASSERTcount hasHoles && this-structurevm-holesMustForwardToPrototypevm,...