CVE-2023-4863
Coverage and Recommendation for Lookout Admins
Lookout strongly suggests all mobile device users turn on the app auto-update capability on their respective devices. Lookout admins should proactively enable the vulnerability protection policy in the Lookout console and configure it with the appropriate remediation actions that align with their organization’s response workflows. As of September 21st, Lookout will alert on Chrome for Android versions 117.0.5938.59 or below under the coverage “Chrome-CVE-2023-4863”. In addition, CISA is requiring all government organizations to update to the patched versions of the app by October 4th, 2023.
In addition, Microsoft Edge, published an update patching this CVE, which Lookout will cover as Edge-CVE-2023-4863 and will detect any version lower thatn 117.0.2045.31 as vulnerable.
Overview
Google released a patch for a new zero-day vulnerability in Chrome tracked as CVE-2023-4863 on September 12th. CISA also listed the CVE in their database after Google disclosed that there is active exploitation of CVE-2023-4863. CISA’s action mandates government organizations to apply the fix by October 4th, 2023. A desktop fix was released for the same earlier in the month. This is a case of heap buffer overflow in the WebP image format of Google Chrome. It allows a remote attacker to perform arbitrary code execution leading to a crash via a crafted HTML page.
Lookout Analysis
The most likely way for an attacker to exploit this vulnerability would be to send their target a link to a malcrafted webpage in hopes that the target still has a vulnerable version of Chrome on their device (Chromium security severity: Critical). They can perform an out-of-bounds memory write abusing this vulnerability, and a successful exploit may grant a threat actor access to the vulnerable browser’s capabilities without needing to root the device. It can also enable threat actors to crash a program. While other Chromium-based browsers have not received a fix or mentioned being affected, Lookout will keep an eye out for such updates.
A similar image processing vulnerability (CVE-2023-41064) was recently fixed in iOS and iPadOS, and was linked with BlastPass exploitation for delivery of Pegasus.
Mobile device management (MDM) tools will not detect successful exploitation of this vulnerability. In the event of a successful exploit, the actor could have access to any capability that the Chrome browser has.
Authors
Lookout
Lookout, Inc. is the data-centric cloud security company that uses a defense-in-depth strategy to address the different stages of a modern cybersecurity attack. Data is at the core of every organization, and our approach to cybersecurity is designed to protect that data within today’s evolving threat landscape no matter where or how it moves.
