|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.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)|
|References||DLA-779-1, DSA-3754-1, DSA-3755-1|
|NVD severity||medium (attack range: remote)|
Vulnerable and fixed packages
The table below lists information on source packages.
|tomcat6 (PTS)||jessie (security), jessie||6.0.45+dfsg-1~deb8u1||fixed|
|tomcat7 (PTS)||jessie (security), jessie||7.0.56-3+deb8u11||fixed|
|tomcat8 (PTS)||jessie (security), jessie||8.0.14-1+deb8u11||fixed|
|stretch (security), stretch||8.5.14-1+deb9u2||fixed|
The information below is based on the following data on fixed versions.
Since 7.0.72-3, src:tomcat7 only builds the Servlet API
Since 6.0.41-3, src:tomcat6 only builds a servlet and docs in Jessie
Fixed by: http://svn.apache.org/r1777469 (8.0.x)
Fixed by: http://svn.apache.org/r1777471 (7.0.x)
Fixed by: http://svn.apache.org/r1777472 (6.0.x)