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. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.

TuxCare rebuilt 7 packages to address 11 CVEs. Fixed in 7.0.70-tuxcare.3.

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 (CVE-2018-1336).

The defaults settings for the CORS filter are insecure and enable supportsCredentials for all origins. It is expected that users of the CORS filter will have configured it appropriately for their environment rather than using it in the default configuration. Therefore, it is expected that most users will not be impacted by this issue (CVE-2018-8014).

The host name verification when using TLS with the WebSocket client was missing. It is now enabled by default (CVE-2018-8034).

When the default servlet 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 (CVE-2018-11784).

These are all security issues fixed in the tomcat-9.0.36-8.4 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the tomcat10-10.1.14-1.1 package on the GA media of openSUSE Tumbleweed.

This update for tomcat to 8.0.53 fixes the following issues:

Security issue fixed:

• 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-2018-8014: Fix insecure default CORS filter settings (bsc#1093697).

Bug fixes:

• bsc#1067720: Avoid overwriting of customer's configuration during update.
• bsc#1095472: Add Obsoletes for tomcat6 packages.

This update for tomcat to version 9.0.10 fixes the following issues:

Security issues fixed:

• 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-2018-8014: Fix insecure default CORS filter settings (bsc#1093697).
• 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).

Bug fixes:

• Avoid overwriting of customer's configuration during update (bsc#1067720)

• Disable adding OSGi metadata to JAR files

• See changelog at http://tomcat.apache.org/tomcat-9.0-doc/changelog.html#Tomcat_9.0.10_(markt)

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 decoding certain UTF-8 strings. A remote attacker could possibly use this issue to cause Tomcat to crash, resulting in a denial of service. (CVE-2018-1336)

It was discovered that the Tomcat WebSocket client incorrectly performed hostname verification. A remote attacker could possibly use this issue to intercept sensitive information. (CVE-2018-8034)

It was discovered that Apache Tomcat 7 did not protect applications from the presence of untrusted client data in an environment variable. A remote attacker could possible use this vulnerability to redirect the traffic to an arbitrary proxy and obtain sensitive information. (CVE-2016-5388)

It was discovered that Apache Tomcat 7 mishandled specially crafted input. An attacker could use this vulnerability to cause a denial of service. (CVE-2018-1336)