{"id":108095,"date":"2023-04-26T12:48:19","date_gmt":"2023-04-26T10:48:19","guid":{"rendered":"https:\/\/prohoster.info\/?p=108095"},"modified":"2023-04-27T10:34:32","modified_gmt":"2023-04-27T08:34:32","slug":"uyazvimosti-v-git-pozvolyayushhie-perezapisat-fajly-ili-vypolnit-svoj-kod","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimosti-v-git-pozvolyayushhie-perezapisat-fajly-ili-vypolnit-svoj-kod","title":{"rendered":"Zranite\u013enosti v Gite, ktor\u00e9 umo\u017e\u0148uj\u00fa prep\u00edsa\u0165 s\u00fabory alebo vykona\u0165 vlastn\u00fd k\u00f3d","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Boli publikovan\u00e9 opraven\u00e9 vydania distribuovan\u00e9ho syst\u00e9mu spr\u00e1vy zdrojov\u00e9ho k\u00f3du Git 2.40.1, 2.39.3, 2.38.5, 2.37.7, 2.36.6, 2.35.8, 2.34.8, 2.33.8, 2.32.7, 2.31.8 a 2.30.9, v ktor\u00fdch bolo odstr\u00e1nen\u00fdch p\u00e4\u0165 zranite\u013enost\u00ed. Sledova\u0165 vydanie aktualiz\u00e1ci\u00ed bal\u00edkov v distrib\u00faci\u00e1ch m\u00f4\u017eete na str\u00e1nkach Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Ako obch\u00e1dzaj\u00face opatrenia na ochranu pred zranite\u013enos\u0165ami sa odpor\u00fa\u010da vyhn\u00fa\u0165 sa vykon\u00e1vaniu pr\u00edkazu «git apply \u2014reject» pri pr\u00e1ci s neoveren\u00fdmi extern\u00fdmi z\u00e1platami a skontrolova\u0165 obsah $GIT_DIR\/config pred spusten\u00edm pr\u00edkazov «git submodule deinit», «git config \u2014rename-section» a «git config \u2014remove-section» pri pr\u00e1ci s nespo\u013eahliv\u00fdmi repozit\u00e1rmi. <\/p>\n

Zranite\u013enos\u0165 CVE-2023-29007 umo\u017e\u0148uje dosiahnu\u0165 vlo\u017eenie nastaven\u00ed do s\u00faboru konfigur\u00e1cie $GIT_DIR\/config, ktor\u00e9 m\u00f4\u017eu by\u0165 pou\u017eit\u00e9 na vykonanie k\u00f3du v syst\u00e9me prostredn\u00edctvom uvedenia ciest k vykonate\u013en\u00fdm s\u00faborom v direkt\u00edvach core.pager, core.editor a core.sshCommand. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 logickou chybou, ktor\u00e1 sp\u00f4sobuje, \u017ee ve\u013emi dlh\u00e9 hodnoty konfigur\u00e1cie m\u00f4\u017eu by\u0165 spracovan\u00e9 ako za\u010diatok novej sekcie pri vykon\u00e1van\u00ed oper\u00e1ci\u00ed premenovania alebo odstr\u00e1nenia sekcie zo s\u00faboru konfigur\u00e1cie. V praxi sa d\u00e1 dosiahnu\u0165 exploat\u00e1cia zranite\u013en\u00fdch hodn\u00f4t prostredn\u00edctvom uvedenia ve\u013emi dlh\u00fdch URL submodulov, ktor\u00e9 sa ukladaj\u00fa do s\u00faboru $GIT_DIR\/config po\u010das inicializ\u00e1cie. Tieto URL m\u00f4\u017eu by\u0165 interpretovan\u00e9 ako nov\u00e9 nastavenia pri pokuse o ich odstr\u00e1nenie cez «git submodule deinit». <\/p>\n

Zranite\u013enos\u0165 CVE-2023-25652 umo\u017e\u0148uje prep\u00edsa\u0165 obsah s\u00faborov mimo pracovn\u00e9ho adres\u00e1ra pri spracovan\u00ed pr\u00edkazom «git apply —reject» \u0161peci\u00e1lne form\u00e1tovan\u00fdch patchov. Pri pokuse o vykonanie pr\u00edkazu «git apply» s \u0161kodliv\u00fdm patchom, ktor\u00fd sa pok\u00fa\u0161a zap\u00edsa\u0165 do s\u00faboru cez symbolick\u00fd odkaz, bude oper\u00e1cia zamietnut\u00e1. V Git 2.39.1 bola ochrana pred manipul\u00e1ciou cez symbolick\u00e9 odkazy doplnen\u00e1 o blokovanie patchov, ktor\u00e9 vytv\u00e1raj\u00fa symbolick\u00e9 odkazy a pok\u00fa\u0161aj\u00fa sa vykona\u0165 z\u00e1pis cez ne. Podstata zva\u017eovanej zranite\u013enosti spo\u010d\u00edva v tom, \u017ee Git nezoh\u013ead\u0148oval, \u017ee pou\u017e\u00edvate\u013e m\u00f4\u017ee vykona\u0165 pr\u00edkaz «git apply —reject» na z\u00e1pis zamietnut\u00fdch \u010dast\u00ed patchu vo forme s\u00faborov s pr\u00edponou «.rej» a \u00fato\u010dn\u00edk m\u00f4\u017ee t\u00fato mo\u017enos\u0165 vyu\u017ei\u0165 na z\u00e1pis obsahu do \u013eubovo\u013en\u00e9ho adres\u00e1ra, pokia\u013e to dovo\u013euj\u00fa aktu\u00e1lne opr\u00e1vnenia. <\/p>\n

Okrem toho boli odstr\u00e1nen\u00e9 tri zranite\u013enosti, ktor\u00e9 sa prejavuj\u00fa len na platforme Windows: CVE-2023-29012 (vyh\u013ead\u00e1vanie spustite\u013en\u00e9ho doskey.exe v pracovnom adres\u00e1ri repozit\u00e1ra pri vykon\u00e1van\u00ed pr\u00edkazu «Git CMD», \u010do umo\u017e\u0148uje spusti\u0165 svoj k\u00f3d v syst\u00e9me pou\u017e\u00edvate\u013ea), CVE-2023-25815 (preplnenie vyrovn\u00e1vacej pam\u00e4te pri spracovan\u00ed \u0161peci\u00e1lne form\u00e1tovan\u00fdch s\u00faborov lokaliz\u00e1cie v gettext) a CVE-2023-29011 (mo\u017enos\u0165 podvies\u0165 s\u00fabor connect.exe pri pr\u00e1ci cez SOCKS5).
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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