Mozilla Spidermonkey - Unboxed Objects Uninitialized Memory Access

/ For constructors, Spidermonkey implements a "definite property analysis" 1 to compute which properties will definitely exist on the constructed objects. Spidermonkey then directly allocates the constructed objects with the final Shape. As such, at the entrypoint of the constructor the construct...

Mozilla Spidermonkey - IonMonkey 'Array.prototype.pop' Type Confusion

The following program found through fuzzing and manually modified crashes Spidermonkey built from the current beta channel and Firefox 66.0.3 current stable: // Run with --no-threads for increased reliability const v4 = a: 0, a: 1, a: 2, a: 3, a: 4; function v7v8,v9 if v4.length == 0 v43 = a: 5; ...

Mozilla Spidermonkey - IonMonkey Array.prototype.pop Type Confusion

Mozilla Spidermonkey - IonMonkey Array.prototype.pop Type Confusion The following program found through fuzzing and manually modified crashes Spidermonkey built from the current beta channel and Firefox 66.0.3 current stable: // Run with --no-threads for increased reliability const v4 = a: 0, a: ...

Mozilla Spidermonkey - IonMonkey (Array.prototype.pop) Type Confusion Exploit

The following program found through fuzzing and manually modified crashes Spidermonkey built from the current beta channel and Firefox 66.0.3 current stable: // Run with --no-threads for increased reliability const v4 = a: 0, a: 1, a: 2, a: 3, a: 4; function v7v8,v9 if v4.length == 0 v43 = a: 5; ...

Spidermonkey IonMonkey Incorrect Prediction

Spidermonkey: IonMonkey incorrectly predicts return type of Array.prototype.pop, leading to type confusions Related CVE Numbers: CVE-2019-11707Fixed-2019-Jun-18. The following program found through fuzzing and manually modified crashes Spidermonkey built from the current beta channel and Firefox...

[SECURITY] Fedora 30 Update: mozjs60-60.7.2-1.fc30

SpiderMonkey is the code-name for Mozilla Firefox's C++ implementation of JavaScript. It is intended to be embedded in other applications that provide host environments for JavaScript...

[SECURITY] Fedora 30 Update: gjs-1.56.2-4.fc30

Gjs allows using GNOME libraries from Javascript. It's based on the Spidermonkey Javascript engine from Mozilla and the GObject introspection framework...

Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script

Spidermonkey - IonMonkey Leaks JSOPTIMIZEDOUT Magic Value to Script IonMonkey can, during a bailout, leak an internal JSOPTIMIZEDOUT magic value to the running script. This magic value can then be used to achieve memory corruption. Prerequisites Magic Values Spidermonkey represents JavaScript...

Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation

Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation 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...

Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation

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...

Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation Exploit

Spidermonkey IonMonkey suffers from an issue where an unexpected ObjectGroup in the ObjectGroupDispatch operation might lead to potentially unsafe code being executed. Spidermonkey: IonMonkey: unexpected ObjectGroup in ObjectGroupDispatch operation might lead to potentially unsafe code being...

Spidermonkey IonMonkey JS_OPTIMIZED_OUT Value Leak

Spidermonkey: IonMonkey leaks JSOPTIMIZEDOUT magic value to script Related CVE Numbers: CVE-2019-9792. TURN ON "CODE FONT" IN THE TOP RIGHT TO CORRECTLY SEE THE CFGs! IonMonkey can, during a bailout, leak an internal JSOPTIMIZEDOUT magic value to the running script. This magic value can then be...

Spidermonkey IonMonkey JS_OPTIMIZED_OUT Value Leak Exploit

Spidermonkey IonMonkey can, during a bailout, leak an internal JSOPTIMIZEDOUT magic value to the running script. This magic value can then be used to achieve memory corruption. Spidermonkey: IonMonkey leaks JSOPTIMIZEDOUT magic value to script Related CVE Numbers: CVE-2019-9792. TURN ON "CODE...

CVE-2016-9969

In libwebp 0.5.1, there is a double free bug in libwebpmux...

CVE-2019-9814

Mozilla developers and community members reported memory safety bugs present in Firefox 66. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox 67...

CVE-2019-9821

A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. This vulnerability affects Firefox 67...

CVE-2018-18510

The about:crashcontent and about:crashparent pages can be triggered by web content. These pages are used to crash the loaded page or the browser for test purposes. This issue allows for a non-persistent denial of service DOS attack by a malicious site which links to these pages. This vulnerabilit...

SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)

SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types Type Confusion A bug in IonMonkey leaves type inference information inconsistent, which in turn allows the compilation of JITed functions that cause type confusions between arbitrary objects. Prerequisites In...

SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)

A bug in IonMonkey leaves type inference information inconsistent, which in turn allows the compilation of JITed functions that cause type confusions between arbitrary objects. Prerequisites In Spidermonkey, every JavaScript objects is an instance of the JSObject class 1. Plain JavaScript objects...

SpiderMonkey IonMonkey Type Confusion

SpiderMonkey: IonMonkey compiled code fails to update inferred property types, leading to type confusions Related CVE Numbers: CVE-2019-9813 A bug in IonMonkey leaves type inference information inconsistent, which in turn allows the compilation of JITed functions that cause type confusions betwee...