{"id":102562,"date":"2021-12-10T09:36:48","date_gmt":"2021-12-10T07:36:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty"},"modified":"2021-12-10T09:36:48","modified_gmt":"2021-12-10T07:36:48","slug":"katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","title":{"rendered":"Kritisk s\u00e5rbarhed i Apache Log4j, der p\u00e5virker mange Java-projekter","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Apache Log4j, et popul\u00e6rt rammev\u00e6rk til logning i Java-applikationer, er der opdaget en kritisk s\u00e5rbarhed, som muligg\u00f8r udf\u00f8relse af vilk\u00e5rlig kode ved logning af specielt formaterede v\u00e6rdier i formatet . Angrebet kan udf\u00f8res p\u00e5 Java-applikationer, der logger v\u00e6rdier hentet fra eksterne kilder, eksempelvis n\u00e5r der vises problematiske v\u00e6rdier i fejlmeddelelser. <\/p>\n

Det bem\u00e6rkes, at n\u00e6sten alle projekter, der bruger frameworks som Apache Struts, Apache Solr, Apache Druid eller Apache Flink, er s\u00e5rbare, inklusive Steam, Apple iCloud, og klientside- og serversideapplikationer til Minecraft. Det forventes, at s\u00e5rbarheden kan f\u00f8re til en b\u00f8lge af massangreb p\u00e5 virksomhedsapplikationer, der gentager historien om kritiske s\u00e5rbarheder i Apache Struts, som ca. 65 % af virksomhederne p\u00e5 Fortune 100-listen anvender i deres web-applikationer. Der er allerede registreret fors\u00f8g p\u00e5 at scanne netv\u00e6rket for s\u00e5rbare systemer. <\/p>\n

Problemet forv\u00e6rres af, at der allerede er offentliggjort en fungerende exploit, men der findes endnu ikke rettelser til stabile versioner. CVE-identifikatoren er endnu ikke tildelt. Rettelsen er kun inkluderet i testversionen log4j-2.15.0-rc1. For at omg\u00e5 s\u00e5rbarheden anbefales det at indstille parameteren log4j2.formatMsgNoLookups til true. <\/p>\n

Problemet opstod, fordi log4j underst\u00f8tter behandling af specielle masker i de strenge, der logges, hvor JNDI-foresp\u00f8rgsler (Java Naming and Directory Interface) kunne udf\u00f8res. Angrebet g\u00e5r ud p\u00e5 at sende en streng med substitut , som log4j vil behandle ved at sende til server<\/a> en LDAP-foresp\u00f8rgsel til stien til Java-klassen hos attacker.com. Den returnerede serveren<\/a> angriberens sti (f.eks. http:\/\/second-stage.attacker.com\/Exploit.class) vil blive hentet og udf\u00f8rt i konteksten af den nuv\u00e6rende proces, hvilket giver angriberen mulighed for at udf\u00f8re vilk\u00e5rlig kode p\u00e5 systemet med rettighederne for den aktuelle applikation. <\/p>\n

Till\u00e6g 1: S\u00e5rbarheden er tildelt CVE-2021-44228. <\/p>\n

Till\u00e6g 2: Der er fundet en metode til at omg\u00e5 beskyttelsen, der blev tilf\u00f8jet i version log4j-2.15.0-rc1. En ny opdatering log4j-2.15.0-rc2 er blevet foresl\u00e5et med en mere omfattende beskyttelse mod s\u00e5rbarheden. I koden fremh\u00e6ves \u00e6ndringen, der vedr\u00f8rer frav\u00e6ret af en nedbrudsh\u00e5ndtering ved brug af et forkert formateret JNDI URL.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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