Microsoft Edge/ChakraCore Chakra Scripting Engine memory corruption

Summaryinfo

A vulnerability, which was classified as critical, has been found in Microsoft Edge and ChakraCore. Affected by this vulnerability is an unknown functionality of the component Chakra Scripting Engine. This manipulation causes memory corruption. This vulnerability is registered as CVE-2019-0933. Remote exploitation of the attack is possible. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability classified as critical was found in Microsoft Edge and ChakraCore (Web Browser) (affected version unknown). Affected by this vulnerability is an unknown functionality of the component Chakra Scripting Engine. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 05/14/2019. The weakness was published 05/14/2019 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release has been coordinated with Microsoft. This vulnerability is known as CVE-2019-0933 since 11/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2023). The advisory points out:

A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 91527 (Microsoft Edge Security Update for May 2019).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Similar entries are available at VDB-134673, VDB-134674, VDB-134675 and VDB-134676. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Web Browser

Vendor

• Microsoft

Name

• ChakraCore
• Edge

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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