{"id":98993,"date":"2021-02-02T20:42:15","date_gmt":"2021-02-02T18:42:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-sistemnom-vyzove-futex-obnaruzhena-i-ustranena-vozmozhnost-vypolneniya-polzovatelskogo-koda-v-kontekste-yadra"},"modified":"2021-02-02T20:42:15","modified_gmt":"2021-02-02T18:42:15","slug":"v-sistemnom-vyzove-futex-obnaruzhena-i-ustranena-vozmozhnost-vypolneniya-polzovatelskogo-koda-v-kontekste-yadra","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/v-sistemnom-vyzove-futex-obnaruzhena-i-ustranena-vozmozhnost-vypolneniya-polzovatelskogo-koda-v-kontekste-yadra","title":{"rendered":"Im Systemaufruf futex wurde eine M\u00f6glichkeit entdeckt und behoben, die es erm\u00f6glichte, Benutzer-Code im Kontext des Kernels auszuf\u00fchren.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In der Implementierung des Systemaufrufs futex (fast userspace mutex) wurde die Verwendung von Stack-Speicher nach der Freigabe entdeckt und behoben. Dies erm\u00f6glichte es einem Angreifer, seinen Code im Kontext des Kernels auszuf\u00fchren, mit allen sich daraus ergebenden Sicherheitsfolgen. Die Schwachstelle befand sich im Fehlerbehandler-Code.<\/p>\n

<\/p>\n

Korrektur<\/a> Die Schwachstelle trat im Linux-Hauptzweig am 28. Januar auf und wurde vor zwei Tagen in den Kerneln 5.10.12, 5.4.94, 4.19.172, 4.14.218 aufgenommen.<\/p>\n

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

W\u00e4hrend der Diskussion \u00fcber diese Korrektur wurde die Vermutung ge\u00e4u\u00dfert, dass diese Schwachstelle in allen Kernen seit 2008 vorhanden ist:<\/p>\n

<\/p>\n

https:\/\/www.openwall.com\/lists\/oss-security\/2021\/01\/29\/3<\/a><\/p>\n

<\/noindex>
\nFWIW, dieser Commit hat:<\/p>\n

Fehlerbehebungen: 1b7558e457ed (\"futexes: Fehlerbehebung bei der Fehlerbehandlung in futex_lock_pi\")<\/p>\n

und dieser andere Commit stammt aus dem Jahr 2008. Daher sind wahrscheinlich alle derzeit
\nunterst\u00fctzten Linux-Distributionen und -Implementierungen betroffen, es sei denn, etwas
\nanderes hat das Problem in einigen Kernel-Versionen gemildert.<\/p>\n

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

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