Debian LTS: DLA-2391-1: ruby2.3 security update
Summary
WEBrick (bundled along with ruby2.3) was too tolerant against
an invalid Transfer-Encoding header. This may lead to
inconsistent interpretation between WEBrick and some HTTP proxy
servers, which may allow the attacker to “smuggle” a request.
For Debian 9 stretch, this problem has been fixed in version
2.3.3-1+deb9u9.
We recommend that you upgrade your ruby2.3 packages.
For the detailed security status of ruby2.3 please refer to
its security tracker page at:
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