Mozilla Firefox/Firefox ESR/Thunderbird JIT Optimizer Argument type confusion

Summaryinfo

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird. It has been declared as critical. Affected is an unknown function of the component JIT Optimizer. Executing a manipulation as part of Argument can lead to type confusion. This vulnerability is handled as CVE-2020-15656. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (version now known) and classified as critical. This vulnerability affects some unknown processing of the component JIT Optimizer. The manipulation as part of a Argument leads to a type confusion vulnerability. The CWE definition for the vulnerability is CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

The weakness was released 08/10/2020 as Bug 1647293 as not defined bug report (Bugzilla). The advisory is available at bugzilla.mozilla.org. This vulnerability was named CVE-2020-15656 since 07/10/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/11/2020).

Upgrading eliminates this vulnerability.

Entries connected to this vulnerability are available at VDB-159469, VDB-159468, VDB-159467 and VDB-159465. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox
• Firefox ESR
• Thunderbird

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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