Google Releases Chrome Patch to Fix New Zero

CVE-2022-2294 is a heap buffer overflow (out-of-bounds write, CWE-787) in the WebRTC component used by Google Chrome. A remote attacker can trigger the flaw by luring a user to a crafted HTML page, and successful exploitation allows heap corruption with potential arbitrary code execution (CVSS 3.1: 8.8, high impact on confidentiality, integrity and availability). It affects Chrome prior to 103.0.5060.114 and, because the vulnerable code path resides in the shared WebRTC/WebKit component, it also affects Apple's iPhone OS, iPadOS, macOS/Mac OS X, tvOS and watchOS, WebKitGTK, WPE WebKit, Fedora and Extra Packages for Enterprise Linux (EPEL), and the WebRTC project library itself. Exploitation is confirmed in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2022-08-25 with known ransomware use, and reporting indicates mercenary spyware operators used it as a Chrome zero-day; EPSS places its 30-day exploitation probability at 70.5%. Google fixed the flaw in Chrome 103.0.5060.114, and Apple and the WebKit/WPE maintainers issued their own security updates for affected products.

Do: Upgrade Google Chrome to 103.0.5060.114 or later on all managed and personal endpoints immediately. Apply Apple's released security updates for iPhone OS, iPadOS, macOS, tvOS and watchOS, and updated WebKitGTK, WPE WebKit and Fedora/EPEL packages for WebKit-based deployments. Given the CISA KEV listing, known ransomware use and 70.5% EPSS, prioritize patching and hunt for signs of exploitation (crafted-page lures and any linked spyware or ransomware activity) across browsers and WebKit applications.

CVE-2022-4135 is a heap buffer overflow (CWE-787, out-of-bounds write) in the GPU process of Google Chromium, the browser engine behind Chrome and most other major browsers. It is triggered via a crafted HTML page and, per CISA, requires the attacker to have already compromised the browser's renderer process; the memory corruption in the GPU process can then be leveraged to escape the renderer sandbox. A successful attack moves the attacker out of the tightly restricted renderer sandbox toward the higher-privilege GPU process on the host, a step that can enable further code execution. All users of Chromium-based browsers are affected — CISA explicitly lists Google Chrome, Microsoft Edge, and Opera, among others — though no specific vulnerable version ranges are published in the source data. Exploitation is confirmed in the wild: CISA added the flaw to the Known Exploited Vulnerabilities catalog on 2022-11-28, EPSS assigns a 31.9% probability of exploitation within 30 days (98th percentile), and no public proof-of-concept is known.

Do: Treat unpatched Chromium-based browsers as exposed and apply vendor updates immediately, per CISA's required action: update Google Chrome, Microsoft Edge, Opera, and any other Chromium-based browsers to the latest patched releases available as of the late-November 2022 KEV listing. Inventory managed endpoints for browser versions and verify auto-update is enabled, since the flaw is confirmed exploited in the wild even though no public PoC exists.