CVE-2019-11713

A use-after-free vulnerability can occur in HTTP/2 when a cached HTTP/2 stream is closed while still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR 60.8, Firefox 68, and Thunderbird 60.8...

CVE-2019-11725

When a user navigates to site marked as unsafe by the Safebrowsing API, warning messages are displayed and navigation is interrupted but resources from the same site loaded through websockets are not blocked, leading to the loading of unsafe resources and bypassing safebrowsing protections. This...

CVE-2019-11728

The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox 68...

CVE-2019-11709

Mozilla developers and community members reported memory safety bugs present in Firefox 67 and Firefox ESR 60.7. 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...

CVE-2019-9811

As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation. This vulnerability affects Firefox ESR 60.8, Firefox 68, and Thunderbird 60.8...

CVE-2019-11714

Necko can access a child on the wrong thread during UDP connections, resulting in a potentially exploitable crash in some instances. This vulnerability affects Firefox 68...

CVE-2019-11715

Due to an error while parsing page content, it is possible for properly sanitized user input to be misinterpreted and lead to XSS hazards on web sites in certain circumstances. This vulnerability affects Firefox ESR 60.8, Firefox 68, and Thunderbird 60.8...

Mozilla Spidermonkey - Unboxed Objects Uninitialized Memory Access Exploit

/ 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...

Mozilla Spidermonkey - Unboxed Objects Uninitialized Memory Access

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...

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

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; ...

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; ...

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 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 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

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...