{"id":115207,"date":"2024-04-21T02:30:03","date_gmt":"2024-04-21T00:30:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php"},"modified":"2024-04-21T02:30:03","modified_gmt":"2024-04-21T00:30:03","slug":"uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php","title":{"rendered":"Kwetsbaarheid in Glibc, ge\u00ebxploiteerd via PHP-scripts","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In de standaard C-bibliotheek Glibc is een kwetsbaarheid ontdekt (CVE-2024-2961) die leidt tot buffer-overloop bij het omzetten van speciaal opgemaakte tekenreeksen in de ISO-2022-CN-EXT codering door de iconv() functie. De onderzoeker die het probleem heeft ontdekt, is van plan op 10 mei een presentatie te geven op de OffensiveCon-conferentie, waarin wordt vermeld dat de kwetsbaarheid kan worden ge\u00ebxploiteerd via toepassingen in de programmeertaal PHP. Er wordt beweerd dat dit probleem de gehele PHP-ecosysteem en sommige toepassingen treft. <\/p>\n

Bij het converteren van tekenreeksen naar de UCS4-codering, overeenkomstig de eisen van RFC 1922, voegt de bibliotheek bepaalde escape-tekens toe die de delen van de tekenreeks markeren waar de codering is veranderd. De kwetsbaarheid wordt veroorzaakt door een onjuiste controle van de grenzen van interne buffers door de functie iconv(), wat kan leiden tot een bufferoverloop van maximaal 4 bytes. Bij een overstap buiten de buffer kunnen specifieke vaste waarden worden geschreven, zoals '$+I', '$+J', '$+K', '$+L', '$+M' en '$*H'. Hoewel het exploitatie van een dergelijke kwetsbaarheid voor code-uitvoering onwaarschijnlijk lijkt, blijkt uit de verklaring van de onderzoeker die het probleem heeft ontdekt dat dit voldoende was om verschillende prototypes van exploits voor een externe aanval op PHP-toepassingen te ontwikkelen, wat kan leiden tot code-uitvoering. <\/p>\n

De kwetsbaarheid is al aanwezig sinds het jaar 2000 en is verholpen in de in ontwikkeling zijnde versie Glibc 2.40. De fix is ook beschikbaar in de vorm van patches voor Glibc-releases van 2.32 tot 2.39. In de distributies kan men de opvolging van de kwetsbaarheidfix vinden op pagina's zoals: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch.
\n
Bron: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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