{"id":100782,"date":"2021-07-16T22:22:59","date_gmt":"2021-07-16T20:23:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov"},"modified":"2021-07-16T22:22:59","modified_gmt":"2021-07-16T20:23:00","slug":"uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/uyazvimost-v-ublock-origin-privodyashhaya-k-krahu-ili-ischerpaniyu-resursov","title":{"rendered":"A vulnerability in uBlock Origin that leads to crashes or resource exhaustion","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A vulnerability has been identified in the uBlock Origin content blocking system, allowing for a crash or memory exhaustion when navigating to a specially formatted URL, provided that this URL falls under strict blocking filters. The vulnerability manifests only when directly accessing the problematic URL, such as by clicking on a link. <\/p>\n

The vulnerability has been fixed in uBlock Origin update 1.36.2. The uMatrix extension is also affected by a similar issue, but its support has been discontinued and no further updates are being released. There are no workarounds in uMatrix (initially, it was suggested to disable all strict blocking filters via the 'Assets' tab, but this recommendation was found insufficient and problematic for users with custom blocking rules). In \u03bcMatrix, a fork of uMatrix from the Pale Moon project, the vulnerability has been resolved in release 4.4.9. <\/p>\n

The strict blocking filter is usually defined at the level domains<\/a> and implies a prohibition on any connections, even when directly accessing a link. The vulnerability is caused by the fact that, during the transition to a page that falls under the strict blocking filter, the user is shown a warning that provides information about the blocked resource, including the URL and query parameters. The problem is that uBlock Origin parses the query parameters recursively and adds them to the DOM tree without taking nesting levels into account. <\/p>\n

Processing a specially crafted URL in uBlock Origin for Chrome can cause the process running the browser extension to crash. After the crash, until the process with the extension restarts, the user remains without blocking unwanted content. Memory exhaustion is observed in Firefox.

\"A<\/center>
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Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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