CVE-2017-15706

As part of the fix for bug 61201, the documentation for Apache Tomcat 9.0.0.M22 to 9.0.1, 8.5.16 to 8.5.23, 8.0.45 to 8.0.47 and 7.0.79 to 7.0.82 included an updated description of the search algorithm used by the CGI Servlet to identify which script to execute. The update was not correct. As a result, some scripts may have failed to execute as expected and other scripts may have been executed unexpectedly. Note that the behaviour of the CGI servlet has remained unchanged in this regard. It is only the documentation of the behaviour that was wrong and has been corrected.

In Tomcat 8.0.45, the description of the search algorithm used by the CGI Servlet to identify which script to execute was updated. The update was not correct. As a result, some scripts may have failed to execute as expected and other scripts may have been executed unexpectedly. Note that the behavior of the CGI servlet has remained unchanged in this regard. It is only the documentation of the behavior that was wrong and has been corrected (CVE-2017-15706).

The URL pattern of "" (the empty string) which exactly maps to the context root was not correctly handled when used as part of a security constraint definition. This caused the constraint to be ignored. It was, therefore, possible for unauthorized users to gain access to web application resources that should have been protected. Only security constraints with a URL pattern of the empty string were affected (CVE-2018-1304).

Security constraints defined by annotations of Servlets were only applied once a Servlet had been loaded. Because security constraints defined in this way apply to the URL pattern and any URLs below that point, it was possible - depending on the order Servlets were loaded - for some security constraints not to be applied. This could have exposed resources to users who were not authorized to access them (CVE-2018-1305).

This update for tomcat fixes the following issues:

Security issues fixed:

• CVE-2018-1305: Fixed late application of security constraints that can lead to resource exposure for unauthorised users (bsc#1082481).
• CVE-2018-1304: Fixed incorrect handling of empty string URL in security constraints that can lead to unitended exposure of resources (bsc#1082480).
• CVE-2017-15706: Fixed incorrect documentation of CGI Servlet search algorithm that may lead to misconfiguration (bsc#1078677).

This update for tomcat fixes the following issues:

Version update to 7.0.90:

• Another bugfix release, for full details see: https://tomcat.apache.org/tomcat-7.0-doc/changelog.html

Security issues fixed:

• CVE-2018-11784: When the default servlet in Apache Tomcat returned a redirect to a directory (e.g. redirecting to '/foo/' when the user requested '/foo') a specially crafted URL could be used to cause the redirect to be generated to any URI of the attackers choice. (bsc#1110850)
• CVE-2017-15706: As part of the fix for bug 61201, the documentation for Apache Tomcat included an updated description of the search algorithm used by the CGI Servlet to identify which script to execute. The update was not correct. As a result, some scripts may have failed to execute as expected and other scripts may have been executed unexpectedly. Note that the behaviour of the CGI servlet has remained unchanged in this regard. It is only the documentation of the behaviour that was wrong and has been corrected.(bsc#1078677)
• CVE-2018-1304: The URL pattern of '' (the empty string) which exactly maps to the context root was not correctly handled in Apache Tomcat when used as part of a security constraint definition. This caused the constraint to be ignored. It was, therefore, possible for unauthorised users to gain access to web application resources that should have been protected. Only security constraints with a URL pattern of the empty string were affected. (bsc#1082480)
• CVE-2018-1305: Security constraints defined by annotations of Servlets in Apache Tomcat were only applied once a Servlet had been loaded. Because security constraints defined in this way apply to the URL pattern and any URLs below that point, it was possible - depending on the order Servlets were loaded - for some security constraints not to be applied. This could have exposed resources to users who were not authorised to access them.(bsc#1082481)
• CVE-2018-1336: An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. (bsc#1102400)
• CVE-2018-8014: Fixed default settings for the CORS filter, which were insecure and enabled 'supportsCredentials' for all origins. (bsc#1093697)
• CVE-2018-8034: Fixed the host name verification when using TLS with the WebSocket client, which was not enabled by default. (bsc#1102379)

This update for tomcat to version 8.0.53 fixes the following security issues:

• CVE-2018-11784: When the default servlet in Apache Tomcat returned a redirect to a directory (e.g. redirecting to '/foo/' when the user requested '/foo') a specially crafted URL could be used to cause the redirect to be generated to any URI of the attackers choice. (bsc#1110850)
• CVE-2018-1336: An improper handing of overflow in the UTF-8 decoder with supplementary characters could have lead to an infinite loop in the decoder causing a Denial of Service (bsc#1102400)
• CVE-2018-8034: The host name verification when using TLS with the WebSocket client was missing. It is now enabled by default (bsc#1102379)
• CVE-2018-8037: If an async request was completed by the application at the same time as the container triggered the async timeout, a race condition existed that could have resulted in a user seeing a response intended for a different user. An additional issue was present in the NIO and NIO2 connectors that did not correctly track the closure of the connection when an async request was completed by the application and timed out by the container at the same time. This could also have resulted in a user seeing a response intended for another user (bsc#1102410)
• CVE-2018-1305: Fixed late application of security constraints that can lead to resource exposure for unauthorised users (bsc#1082481).
• CVE-2018-1304: Fixed incorrect handling of empty string URL in security constraints that can lead to unitended exposure of resources (bsc#1082480).
• CVE-2017-15706: Fixed incorrect documentation of CGI Servlet search algorithm that may lead to misconfiguration (bsc#1078677).
• CVE-2018-8014: The defaults settings for the CORS filter were insecure and enable 'supportsCredentials' for all origins (bsc#1093697).

It was discovered that Tomcat incorrectly handled being configured with HTTP PUTs enabled. A remote attacker could use this issue to upload a JSP file to the server and execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-12616, CVE-2017-12617)

It was discovered that Tomcat contained incorrect documentation regarding description of the search algorithm used by the CGI Servlet to identify which script to execute. This issue only affected Ubuntu 17.10. (CVE-2017-15706)

It was discovered that Tomcat incorrectly handled en empty string URL pattern in security constraint definitions. A remote attacker could possibly use this issue to gain access to web application resources, contrary to expectations. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-1304)

It was discovered that Tomcat incorrectly handled applying certain security constraints. A remote attacker could possibly access certain resources, contrary to expectations. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-1305)

It was discovered that the Tomcat CORS filter default settings were insecure and would enable 'supportsCredentials' for all origins, contrary to expectations. (CVE-2018-8014)