{"id":41185,"date":"2020-02-06T14:41:55","date_gmt":"2020-02-06T11:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/openwrt-19-07-1"},"modified":"2020-02-06T14:41:55","modified_gmt":"2020-02-06T11:41:55","slug":"openwrt-19-07-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/openwrt-19-07-1","title":{"rendered":"OpenWrt 19.07.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"


\n \"OpenWrt<\/p>\n

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

<\/p>\n

Versioner af OpenWrt-distributionen er udgivet 18.06.7<\/a> og 19.07.1<\/a>, hvor der er rettet ASLR i programmer med setuid-flaget og bestemme adressefordelingen i de indl\u00e6ste biblioteker gennem manipulation af milj\u00f8variablen LD_PREFER_MAP_32BIT_EXEC.<\/a> CVE-2020-7982 i pakkeadministratoren opkg, som gjorde det muligt at udf\u00f8re en MITM-attack og \u00e6ndre indholdet af den pakke, der blev hentet fra depotet. P\u00e5 grund af en fejl i kontrolsumcheck-koden kunne angriberen ignorere SHA-256-kontrollene fra pakken, hvilket tillod at omg\u00e5 integritetskontrollerne for de downloadede ipk-ressourcer.<\/p>\n

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

Problemet har eksisteret siden februar 2017, efter at koden til at ignorere indledende mellemrum f\u00f8r kontrolsummen blev tilf\u00f8jet. P\u00e5 grund af fejlen, der opst\u00e5r ved at springe over mellemrum, blev pegeren ikke flyttet til den rigtige position i strengen, og dekodningssl\u00f8jfen for den hexadecimale SHA-256-sekvens returnerede straks kontrolsummen af l\u00e6ngde nul.<\/p>\n

Da manageren for pakker opkg k\u00f8rte som root, kunne en angriber \u00e6ndre indholdet i ipk-pakken under en MITM-angreb, der blev hentet fra repository'et, mens brugeren k\u00f8rte kommandoen «opkg install». Dette gjorde det muligt for angriberen at f\u00e5 sin kode til at k\u00f8re med root-rettigheder ved at tilf\u00f8je egne handler-scripts til pakken, som blev kaldt under installationen. For at udnytte s\u00e5rbarheden skulle angriberen ogs\u00e5 \u00e6ndre pakkernes indeks (for eksempel det, der gives fra downloads.openwrt.org). Den \u00e6ndrede pakke skulle have den samme st\u00f8rrelse som den oprindelige hentet fra indekset.<\/p>\n

I de nye versioner er endnu en ASLR i programmer med setuid-flaget og bestemme adressefordelingen i de indl\u00e6ste biblioteker gennem manipulation af milj\u00f8variablen LD_PREFER_MAP_32BIT_EXEC.<\/a> i libubox-biblioteket, hvilket kan f\u00f8re til buffer overflow under behandling i funktionen blobmsg_format_json af specielt formaterede serialiserede bin\u00e6re data eller data i JSON-format. <\/p>\n

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

Kilde: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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