A security issue and a vulnerability have been reported in Apache Tomcat, which can be exploited by malicious people to disclose certain system information and cause a DoS (Denial of Service).
1) A security issue is caused due to Tomcat using the local host name or the IP address to generate the realm name if no "<realm-name>" is specified for an application in web.xml. This can result in the disclosure of the local host name or the IP address of the system running Tomcat via a "WWW-Authenticate" HTTP header.
2) A vulnerability is caused due to Tomcat not properly handling HTTP requests containing a specially crafted "Transfer-Encoding" header. This can be exploited to e.g. cause potentially sensitive information to be leaked or prevent subsequent requests from being handled correctly by sending specially crafted HTTP requests.
Solution: Update to version 5.5.30 and 6.0.28 or apply patches. Also fixed in version 7.0.1.
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Subject: Apache Tomcat Information Disclosure and Denial of Service
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