CVE-2013-0422

Description

Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using the public getMBeanInstantiator method in the JmxMBeanServer class to obtain a reference to a private MBeanInstantiator object, then retrieving arbitrary Class references using the findClass method, and (2) using the Reflection API with recursion in a way that bypasses a security check by the java.lang.invoke.MethodHandles.Lookup.checkSecurityManager method due to the inability of the sun.reflect.Reflection.getCallerClass method to skip frames related to the new reflection API, as exploited in the wild in January 2013, as demonstrated by Blackhole and Nuclear Pack, and a different vulnerability than CVE-2012-4681 and CVE-2012-3174. NOTE: some parties have mapped the recursive Reflection API issue to CVE-2012-3174, but CVE-2012-3174 is for a different vulnerability whose details are not public as of 20130114. CVE-2013-0422 covers both the JMX/MBean and Reflection API issues. NOTE: it was originally reported that Java 6 was also vulnerable, but the reporter has retracted this claim, stating that Java 6 is not exploitable because the relevant code is called in a way that does not bypass security checks. NOTE: as of 20130114, a reliable third party has claimed that the findClass/MBeanInstantiator vector was not fixed in Oracle Java 7 Update 11. If there is still a vulnerable condition, then a separate CVE identifier might be created for the unfixed issue.

Gravité et risque d'exploitation

CVE-2013-0422 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 97.02 %, ce qui la place devant 99.9 % des CVE référencées.

Que faire ?

• Vérifiez si le produit concerné est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• http://rhn.redhat.com/errata/RHSA-2013-0156.html
• http://malware.dontneedcoffee.com/2013/01/0-day-17u10-spotted-in-while-disable.html
• http://www.mandriva.com/security/advisories?name=MDVSA-2013:095
• http://blog.fuseyism.com/index.php/2013/01/15/security-icedtea-2-1-4-2-2-4-2-3-4-released/
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00025.html
• http://rhn.redhat.com/errata/RHSA-2013-0165.html
• http://www.kb.cert.org/vuls/id/625617
• http://www.us-cert.gov/cas/techalerts/TA13-010A.html
• https://partners.immunityinc.com/idocs/Java%20MBeanInstantiator.findClass%200day%20Analysis.pdf
• http://blog.fireeye.com/research/2013/01/happy-new-year-from-new-java-zero-day.html
• https://www-304.ibm.com/connections/blogs/PSIRT/entry/oracle_java_7_security_manager_bypass_vulnerability_cve_2013_04224?lang=en_us
• http://www.ubuntu.com/usn/USN-1693-1
• https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0018
• http://immunityproducts.blogspot.ca/2013/01/confirmed-java-only-fixed-one-of-two.html
• https://threatpost.com/en_us/blogs/nasty-new-java-zero-day-found-exploit-kits-already-have-it-011013
• http://seclists.org/bugtraq/2013/Jan/48
• http://www.oracle.com/technetwork/topics/security/alert-cve-2013-0422-1896849.html
• http://krebsonsecurity.com/2013/01/zero-day-java-exploit-debuts-in-crimeware/
• http://labs.alienvault.com/labs/index.php/2013/new-year-new-java-zeroday/