{"id":36382,"date":"2019-10-31T22:11:21","date_gmt":"2019-10-31T19:11:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-pozvolyayushhaya-dopolneniyam-chrome-vypolnyat-vneshnij-kod-nesmotrya-na-prava-dostupa\/"},"modified":"2019-10-31T22:11:21","modified_gmt":"2019-10-31T19:11:21","slug":"uyazvimost-pozvolyayushhaya-dopolneniyam-chrome-vypolnyat-vneshnij-kod-nesmotrya-na-prava-dostupa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-pozvolyayushhaya-dopolneniyam-chrome-vypolnyat-vneshnij-kod-nesmotrya-na-prava-dostupa","title":{"rendered":"Egy sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a Chrome kieg\u00e9sz\u00edt\u0151k sz\u00e1m\u00e1ra, hogy k\u00fcls\u0151 k\u00f3dot futtassanak a hozz\u00e1f\u00e9r\u00e9si jogok ellen\u00e9re","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Megjelent<\/a><\/noindex> Olyan m\u00f3dszer, amely lehet\u0151v\u00e9 teszi b\u00e1rmely Chrome-b\u0151v\u00edtm\u00e9ny sz\u00e1m\u00e1ra k\u00fcls\u0151 JavaScript-k\u00f3d v\u00e9grehajt\u00e1s\u00e1t an\u00e9lk\u00fcl, hogy a b\u0151v\u00edtm\u00e9nynek kiterjesztett jogosults\u00e1gokat kellene adnia (az unsafe-eval \u00e9s unsafe-inline n\u00e9lk\u00fcl a manifest.json-ban). A hozz\u00e1f\u00e9r\u00e9si jogok azt felt\u00e9telezik, hogy unsafe-eval n\u00e9lk\u00fcl a b\u0151v\u00edtm\u00e9ny csak a helyi sz\u00e1ll\u00edtm\u00e1nyban tal\u00e1lhat\u00f3 k\u00f3dot tudja v\u00e9grehajtani, de a javasolt m\u00f3dszer megker\u00fcli ezt a korl\u00e1toz\u00e1st, \u00e9s lehet\u0151v\u00e9 teszi b\u00e1rmilyen JavaScript k\u00f3d v\u00e9grehajt\u00e1s\u00e1t, amely egy k\u00fcls\u0151 webhelyr\u0151l van bet\u00f6ltve a b\u0151v\u00edtm\u00e9ny kontextus\u00e1ban.<\/p>\n

Jelenleg a Google megsz\u00fcntette a nyilv\u00e1nos hozz\u00e1f\u00e9r\u00e9st a probl\u00e9m\u00e1r\u00f3l sz\u00f3l\u00f3 jelent\u00e9shez<\/a><\/noindex>, de az arch\u00edvumban megmaradt<\/a><\/noindex> a hiba kihaszn\u00e1l\u00e1s\u00e1hoz sz\u00fcks\u00e9ges k\u00f3dp\u00e9lda. A m\u00f3dszer hasonl\u00f3 a<\/a><\/noindex> A CSP-ben tal\u00e1lhat\u00f3 script-src ‘self’ korl\u00e1toz\u00e1s megker\u00fcl\u00e9s\u00e9nek m\u00f3dszere az, hogy a script taget a document.createElement(‘script’) seg\u00edts\u00e9g\u00e9vel \u00e1ll\u00edtjuk el\u0151, majd k\u00fcls\u0151 tartalom bet\u00f6lt\u00e9s\u00e9t v\u00e9gezz\u00fck a fetch funkci\u00f3val; ezut\u00e1n a k\u00f3d az adott kieg\u00e9sz\u00edt\u0151 kontextus\u00e1ban fog v\u00e9grehajt\u00f3dni.<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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