When using the Index Replication feature, Apache Solr nodes can pull index
files from a master/leader node using an HTTP API which accepts a file
name. However, Solr before 5.5.4 and 6.x before 6.4.1 did not validate the
file name, hence it was possible to craft a special request involving path
traversal, leaving any file readable to the Solr server process exposed.
Solr servers protected and restricted by firewall rules and/or
authentication would not be at risk since only trusted clients and users
would gain direct HTTP access.
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was needed)
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (3.6.2+dfsg-11)
Ubuntu 19.04 (Disco Dingo):not-affected (3.6.2+dfsg-11)
Ubuntu 19.10 (Eoan):not-affected (3.6.2+dfsg-11)
More Information

Updated: 2019-09-19 14:38:55 UTC (commit d32ebc32606b9517c6fa7d65a15441e2a57a6de5)