Debian Security Advisory
DLA-2407-1 tomcat8 -- LTS security update
- Date Reported:
- 14 Oct 2020
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2020-13943.
- More information:
It was discovered that there was an issue in Apache Tomcat 8, the Java application server. An excessive number of concurrent streams could have resulted in users seeing responses for unexpected resources.
If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.
For Debian 9
Stretch, these problems have been fixed in version 8.5.54-0+deb9u4.
We recommend that you upgrade your tomcat8 packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS