CVE-2016-8745

Description

A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.

How to fix CVE-2016-8745

To remediate CVE-2016-8745, upgrade the affected package to a fixed version below.

• —upgrade to 7.0.28-4+deb7u9 or later
• —upgrade to 7.0.56-3+deb8u7 or later
• —upgrade to 8.0.14-1+deb8u6 or later
• —upgrade to 9.0.0.M14 or later

Is CVE-2016-8745 being exploited?

Moderate — EPSS is 10.9%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (4)

• from 0, < 7.0.28-4+deb7u9
• from 0, < 7.0.56-3+deb8u7
• from 0, < 8.0.14-1+deb8u6
• >= 9.0.0.M1, < 9.0.0.M14

CVSS scores

References (53)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2016-8745
• PATCHgithub.com/apache/tomcat
• WEBrhn.redhat.com/errata/RHSA-2017-0457.html
• WEBrhn.redhat.com/errata/RHSA-2017-0527.html
• WEBaccess.redhat.com/errata/RHSA-2017:0455