Amazon Linux AMI : tomcat7 (ALAS-2015-526)
Medium Nessus Plugin ID 83496
SynopsisThe remote Amazon Linux AMI host is missing a security update.
DescriptionIt was discovered that JBoss Web / Apache Tomcat did not limit the length of chunk sizes when using chunked transfer encoding. A remote attacker could use this flaw to perform a denial of service attack against JBoss Web / Apache Tomcat by streaming an unlimited quantity of data, leading to excessive consumption of server resources.
It was found that the org.apache.catalina.servlets.DefaultServlet implementation in JBoss Web / Apache Tomcat allowed the definition of XML External Entities (XXEs) in provided XSLTs. A malicious application could use this to circumvent intended security restrictions to disclose sensitive information. (CVE-2014-0096)
It was found that JBoss Web / Apache Tomcat did not check for overflowing values when parsing request content length headers. A remote attacker could use this flaw to perform an HTTP request smuggling attack on a JBoss Web / Apache Tomcat server located behind a reverse proxy that processed the content length header correctly.
It was discovered that the ChunkedInputFilter in Tomcat did not fail subsequent attempts to read input after malformed chunked encoding was detected. A remote attacker could possibly use this flaw to make Tomcat process part of the request body as new request, or cause a denial of service. (CVE-2014-0227)
SolutionRun 'yum update tomcat7' to update your system.