{"id":33548,"date":"2019-10-31T21:53:15","date_gmt":"2019-10-31T18:53:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-setevom-steke-yadra-linux\/"},"modified":"2019-10-31T21:53:15","modified_gmt":"2019-10-31T18:53:15","slug":"uyazvimost-v-setevom-steke-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-setevom-steke-yadra-linux","title":{"rendered":"S\u00e5rbarhed i netv\u00e6rksstakken i Linux-kernen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I koden til RDS-protokolh\u00e5ndteringen baseret p\u00e5 TCP (Reliable Datagram Socket, net\/rds\/tcp.c) er der opdaget en s\u00e5rbarhed (CVE-2019-11815<\/a><\/noindex>), som kan f\u00f8re til adgang til allerede frigivet hukommelsesomr\u00e5de og serviceafbrydelse (det udelukkes ikke, at det er muligt at udnytte problemet til udf\u00f8relse af kode). Problemet for\u00e5rsages af en race condition, som kan opst\u00e5 under udf\u00f8relsen af funktionen rds_tcp_kill_sock p\u00e5 tidspunktet for oprydning af sockets i netv\u00e6rksnavnerummet. <\/p>\n

I specifikationen NVD<\/a><\/noindex> er problemet markeret som netv\u00e6rksudnytteligt, men if\u00f8lge beskrivelsen rettelsen<\/a><\/noindex>, uden lokalt tilstedev\u00e6relse i systemet og manipulation med navnerum, er det ikke muligt at organisere et angreb eksternt. Is\u00e6r if\u00f8lge mening<\/a><\/noindex> udviklerne fra SUSE, kan s\u00e5rbarheden kun udnyttes lokalt, og at organisere et angreb er tilstr\u00e6kkeligt kompleks og kr\u00e6ver yderligere privilegier i systemet. Hvis NVD vurderer faregraden til 9.3 (CVSS v2) og 8.1 (CVSS v2) point, s\u00e5 vurderer SUSE faren til 6.4 point ud af 10. <\/p>\n

Repr\u00e6sentanter fra Ubuntu har ogs\u00e5 vurderet<\/a><\/noindex> faren ved problemet som moderat. I overensstemmelse med specifikationen CVSS v3.0 er problemet tildelt et h\u00f8jt angrebskompleksitet, og muligheden for udnyttelse er kun vurderet til 2.2 point ud af 10.<\/p>\n

If\u00f8lge if\u00f8lge rapporten<\/a><\/noindex> fra Cisco udnyttes s\u00e5rbarheden eksternt ved at sende TCP-pakker til aktive netv\u00e6rkstjenester RDS<\/a><\/noindex> og der findes allerede en prototype af et exploit. Hvorvidt denne information er korrekt er endnu uklart, muligvis er rapporten blot en kunstnerisk fremstilling af NVD's antagelser. If\u00f8lge oplysninger<\/a><\/noindex> VulDB er exploit endnu ikke oprettet, og problemet udnyttes kun lokalt.<\/p>\n

Problemet optr\u00e6der i kerner op til 5.0.8 og er blokeret af en patch fra marts, retten<\/a><\/noindex>som er inkluderet i versionen 5.0.8. I de fleste distributioner forbliver problemet uafhjulpet (Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>). Fix er udgivet for SLE12 SP3, openSUSE 42.3 og Fedora<\/a><\/noindex>.<\/p>\n

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

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

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