WebKit WebCore::FrameView::scheduleRelayout Use-After-Free(CVE-2017-2514)

An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. The issue involves the “WebKit” component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Asan Log:

=================================================================
==4096==ERROR: AddressSanitizer: heap-use-after-free on address 0x61a0000c0e58 at pc 0x00010da7af9b bp 0x7fff5aaa92d0 sp 0x7fff5aaa92c8
READ of size 8 at 0x61a0000c0e58 thread T0
    #0 0x10da7af9a in WebCore::FrameView::scheduleRelayout() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa7f9a)
    #1 0x10da6d069 in WebCore::FrameView::layout(bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa9a069)
    #2 0x10da82ea1 in WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaafea1)
    #3 0x10da82edf in WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaafedf)
    #4 0x105629eea in WebKit::TiledCoreAnimationDrawingArea::flushLayers() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x4bfeea)
    #5 0x10ec4844b in WebCore::LayerFlushScheduler::layerFlushCallback() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1c7544b)
    #6 0x7fffd624c396 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xa7396)
    #7 0x7fffd624c306 in __CFRunLoopDoObservers (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xa7306)
    #8 0x7fffd622c995 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87995)
    #9 0x7fffd57b8a5b in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30a5b)
    #10 0x7fffd57b8890 in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30890)
    #11 0x7fffd57b86c5 in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x306c5)
    #12 0x7fffd3d5e5b3 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x475b3)
    #13 0x7fffd44d8d6a in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7c1d6a)
    #14 0x7fffd3d52f34 in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3bf34)
    #15 0x7fffd3d1d84f in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x684f)
    #16 0x7fffeb9e88c6 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x108c6)
    #17 0x7fffeb9e72e3 in xpc_main (/usr/lib/system/libxpc.dylib+0xf2e3)
    #18 0x105156b73 in main (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #19 0x7fffeb784254 in start (/usr/lib/system/libdyld.dylib+0x5254)

0x61a0000c0e58 is located 472 bytes inside of 1232-byte region [0x61a0000c0c80,0x61a0000c1150)
freed by thread T0 here:
    #0 0x108730cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x10ad4a73f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18fd73f)
    #2 0x10f448eee in WTF::RefPtr<WebCore::Widget>::operator=(std::nullptr_t) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2475eee)
    #3 0x10f447ab9 in WebCore::RenderWidget::setWidget(WTF::RefPtr<WebCore::Widget>&&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2474ab9)
    #4 0x10da26c7e in WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&, WebCore::IntRect const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa53c7e)
    #5 0x10578df3b in WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x623f3b)
    #6 0x10da3d6ff in WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6a6ff)
    #7 0x10da3c7d3 in WebCore::FrameLoader::commitProvisionalLoad() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa697d3)
    #8 0x10d737bd7 in WebCore::DocumentLoader::finishedLoading(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x764bd7)
    #9 0x10d73fd0e in WebCore::DocumentLoader::maybeLoadEmpty() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x76cd0e)
    #10 0x10d7400d5 in WebCore::DocumentLoader::startLoadingMainResource() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x76d0d5)
    #11 0x10da40c31 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6dc31)
    #12 0x10da3a673 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WebCore::FormState*, bool, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa67673)
    #13 0x10efb4805 in std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>::operator()(WebCore::ResourceRequest const&, WebCore::FormState*, bool) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe1805)
    #14 0x10efb465f in WebCore::PolicyCallback::call(bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe165f)
    #15 0x10efb5fba in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe2fba)
    #16 0x1057781ee in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60e1ee)
    #17 0x105778046 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60e046)
    #18 0x1057880aa in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WebCore::FormState*, std::__1::function<void (WebCore::PolicyAction)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x61e0aa)
    #19 0x10efb5a59 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WebCore::FormState*, std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe2a59)
    #20 0x10da3951f in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6651f)
    #21 0x10da38236 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa65236)
    #22 0x10da34b51 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa61b51)
    #23 0x10da2e040 in WebCore::FrameLoader::loadFrameRequest(WebCore::FrameLoadRequest const&, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5b040)
    #24 0x10da2d5c9 in WebCore::FrameLoader::urlSelected(WebCore::FrameLoadRequest const&, WebCore::Event*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5a5c9)
    #25 0x10ee94e8c in WebCore::ScheduledLocationChange::fire(WebCore::Frame&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1ec1e8c)
    #26 0x10ee9176f in WebCore::NavigationScheduler::timerFired() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1ebe76f)
    #27 0x10fa4c971 in WebCore::ThreadTimers::sharedTimerFiredInternal() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2a79971)
    #28 0x10ecaa46f in WebCore::timerFired(__CFRunLoopTimer*, void*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1cd746f)
    #29 0x7fffd6236243 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x91243)

previously allocated by thread T0 here:
    #0 0x108730790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fffeb9062d9 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x22d9)
    #2 0x10ad54154 in bmalloc::DebugHeap::malloc(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1907154)
    #3 0x10ad494fb in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18fc4fb)
    #4 0x10ace0e95 in bmalloc::Allocator::allocate(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1893e95)
    #5 0x10ace0178 in WTF::fastMalloc(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1893178)
    #6 0x10da65109 in WebCore::FrameView::create(WebCore::Frame&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa92109)
    #7 0x10da26b5c in WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&, WebCore::IntRect const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa53b5c)
    #8 0x10578df3b in WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x623f3b)
    #9 0x10da3d6ff in WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6a6ff)
    #10 0x10da3c7d3 in WebCore::FrameLoader::commitProvisionalLoad() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa697d3)
    #11 0x10d737bd7 in WebCore::DocumentLoader::finishedLoading(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x764bd7)
    #12 0x10d73fd0e in WebCore::DocumentLoader::maybeLoadEmpty() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x76cd0e)
    #13 0x10d7400d5 in WebCore::DocumentLoader::startLoadingMainResource() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x76d0d5)
    #14 0x10da40c31 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6dc31)
    #15 0x10da3a673 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WebCore::FormState*, bool, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa67673)
    #16 0x10efb4805 in std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>::operator()(WebCore::ResourceRequest const&, WebCore::FormState*, bool) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe1805)
    #17 0x10efb465f in WebCore::PolicyCallback::call(bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe165f)
    #18 0x10efb5fba in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe2fba)
    #19 0x1057781ee in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60e1ee)
    #20 0x105778046 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60e046)
    #21 0x1057880aa in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WebCore::FormState*, std::__1::function<void (WebCore::PolicyAction)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x61e0aa)
    #22 0x10efb5a59 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WebCore::FormState*, std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fe2a59)
    #23 0x10da3951f in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa6651f)
    #24 0x10da38236 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa65236)
    #25 0x10da34b51 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa61b51)
    #26 0x10da2e040 in WebCore::FrameLoader::loadFrameRequest(WebCore::FrameLoadRequest const&, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5b040)
    #27 0x10da2d5c9 in WebCore::FrameLoader::urlSelected(WebCore::FrameLoadRequest const&, WebCore::Event*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5a5c9)
    #28 0x10da2d84a in WebCore::FrameLoader::urlSelected(WebCore::URL const&, WTF::String const&, WebCore::Event*, WebCore::LockHistory, WebCore::LockBackForwardList, WebCore::ShouldSendReferrer, WebCore::ShouldOpenExternalURLsPolicy, std::optional<WebCore::NewFrameOpenerPolicy>, WTF::AtomicString const&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5a84a)
    #29 0x10db97108 in WebCore::HTMLAnchorElement::handleClick(WebCore::Event&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbc4108)

SUMMARY: AddressSanitizer: heap-use-after-free (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa7f9a) in WebCore::FrameView::scheduleRelayout()
Shadow bytes around the buggy address:
  0x1c3400018170: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c3400018180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c3400018190: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c34000181a0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c34000181b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x1c34000181c0: fd fd fd fd fd fd fd fd fd fd fd[fd]fd fd fd fd
  0x1c34000181d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c34000181e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c34000181f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018200: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018210: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==4096==ABORTING

Tested on Safari 10.0.3(12602.4.8).