The latest version of Firefox, version 116, has been released. Firefox releases new versions every 28 days, so there will be two upgrades this month. This release does not have any zero-day vulnerabilities, but there are several bug reports that are worth noting.
One of the bug reports, CVE-2023-4045, highlights a potential vulnerability where an offscreen canvas could bypass cross-origin restrictions. This means that a webpage could access images displayed on another page from a different site, potentially exposing sensitive information.
Another bug report, CVE-2023-4047, discusses a potential permissions request bypass via clickjacking. This means that a rogue page could trick users into clicking on an innocent-looking item, which would grant potentially risky permissions without the user’s knowledge or consent.
CVE-2023-4048 addresses a crash in DOMParser due to out-of-memory conditions. This vulnerability could be exploited by a determined attacker who can consume a lot of memory by loading large pages and then trigger a crash using a crafted HTML file.
There is also a stack buffer overflow vulnerability in StorageManager, CVE-2023-4050. This vulnerability could potentially allow an attacker to gain control over a crash, leading to potential exploitation.
Another bug report, CVE-2023-4051, highlights a full-screen notification being obscured by a file open dialog. Full-screen mode gives web pages control over the entire screen, which can be risky as it allows for the modification of any pixel on the display.
Finally, there are memory safety bugs fixed in various Firefox versions, CVE-2023-4057 and CVE-2023-4058. Although these bugs were not obviously exploitable, Mozilla acknowledges that with enough effort, they could have been used to run arbitrary code.
To update to the latest versions, users should go to the “About Firefox” section in the browser. Firefox 116 is the latest version, and Firefox ESR 115.1 is available for users of the Extended Support Release. Thunderbird 115.1 is available for users of Mozilla’s email software.
It is important to note that if using a BSD or Linux distro, the Firefox release may be managed by the distro, so users should check with their provider for updates.
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