{"id":31710,"date":"2019-10-31T21:42:39","date_gmt":"2019-10-31T18:42:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov\/"},"modified":"2019-10-31T21:42:39","modified_gmt":"2019-10-31T18:42:39","slug":"uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov","title":{"rendered":"O vulnerabilitate \u00een Adblock Plus care permite executarea de cod folosind filtre dubioase","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen blocatorul de reclame Adblock Plus a fost identificat\u0103<\/a><\/noindex> vulnerabilitatea, permi\u021b\u00e2nd<\/a><\/noindex> organizarea execut\u0103rii codului JavaScript \u00een contextul site-urilor, atunci c\u00e2nd se folosesc filtre verificate de c\u0103tre atacatori (de exemplu, prin conectarea unor seturi externe de reguli sau prin \u00eenlocuirea regulilor \u00een timpul unui atac MITM).<\/p>\n

Autorele listelor cu seturi de filtre pot organiza executarea propriului cod \u00een contextul site-urilor deschise de utilizatori prin ad\u0103ugarea de reguli cu operatorul «rewrite<\/a><\/noindex>«, care permite \u00eenlocuirea unei p\u0103r\u021bi din URL. Operatorul rewrite nu permite \u00eenlocuirea host-ului din URL, dar ofer\u0103 posibilitatea de a manipula liber argumentele cererii. Ca masc\u0103 pentru \u00eenlocuire, se accept\u0103 doar textul, iar inserarea etichetelor script, object \u0219i subdocument este blocat\u0103<\/a><\/noindex>. <\/p>\n

Cu toate acestea, se poate ob\u021bine executarea codului printr-o ocolire.
\nUnele site-uri, inclusiv Google Maps, Gmail \u0219i Google Images, aplic\u0103 tehnica de \u00eenc\u0103rcare dinamic\u0103 a blocurilor JavaScript executabile, transmise sub form\u0103 de text brut. Dac\u0103 serverul permite redirec\u021bionarea cererilor, se poate ob\u021bine redirec\u021bionarea c\u0103tre un alt host prin modificarea parametrilor URL (de exemplu, \u00een contextul Google redirec\u021bionarea poate fi realizat\u0103 prin API «google.com\/search<\/a><\/noindex>«). Pe l\u00e2ng\u0103 host-urile care permit redirec\u021bionarea, atacul poate fi, de asemenea, \u00eendreptat \u00eempotriva serviciilor care permit g\u0103zduirea con\u021binutului utilizatorilor (g\u0103zduiri de cod, platforme de publicare de articole etc.).<\/p>\n

Metoda de atac propus\u0103 vizeaz\u0103 doar paginile care \u00eencarc\u0103 dinamic liniile cu cod JavaScript (de exemplu, prin XMLHttpRequest sau Fetch) \u0219i apoi le execut\u0103. O alt\u0103 limitare important\u0103 este necesitatea de a folosi redirec\u021bionarea sau de a plasa date arbitrare de c\u0103tre serverul surs\u0103 care furnizeaz\u0103 resursa. Totu\u0219i, ca o demonstra\u021bie a relevan\u021bei atacului, s-a ar\u0103tat cum s\u0103 organiza\u021bi executarea propriului cod la deschiderea maps.google.com, folosind redirec\u021bionarea prin «google.com\/search».<\/p>\n

Corectarea este \u00een prezent \u00een curs de preg\u0103tire. Problema afecteaz\u0103 de asemenea blocatoarele AdBlock<\/a><\/noindex> \u0219i uBlock<\/a><\/noindex>. Blocatorul uBlock Origin nu este vulnerabil la problem\u0103, deoarece nu accept\u0103 operatorul «rewrite». La vremea sa, autorul uBlock Origin
\na renun\u021bat<\/a><\/noindex> a ad\u0103uga suport pentru rewrite, f\u0103c\u00e2nd referire la problemele poten\u021biale de securitate \u0219i la insuficien\u021ba restric\u021biilor la nivel de gazd\u0103 (\u00een loc de rewrite, a fost propus\u0103 op\u021biunea querystrip pentru a cur\u0103\u021ba parametrii cererii \u00een loc de a-i \u00eenlocui).<\/p>\n

Dezvoltatorii Adblock Plus consider\u0103 c\u0103 atacurile reale sunt pu\u021bin probabile, deoarece toate modific\u0103rile din listele de reguli standard sunt revizuite, iar conectarea la liste externe este practicat\u0103 de utilizatori foarte rar. \u00cenlocuirea regulilor prin MITM este exclus\u0103 prin utilizarea implicit\u0103 a HTTPS pentru desc\u0103rcarea listelor de blocare standard (pentru celelalte liste se pl\u0103nuie\u0219te interzicerea desc\u0103rc\u0103rii prin HTTP \u00een viitoarea versiune). Pentru a bloca atacurile pe partea site-urilor, se pot aplica directive CSP<\/a><\/noindex> (Content Security Policy), prin care se pot defini explicit gazdele de la care este permis\u0103 desc\u0103rcarea resurselor externe. <\/p>\n

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

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

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