Bug#891928: CVE-2018-1048: ALLOW_ENCODED_SLASH option not taken into account in the AjpRequestParser

Fri Mar 2 17:42:14 UTC 2018

Source: undertow
Version: 1.4.8-1+deb9u1
Severity: grave
Tags: security
Forwarded: https://issues.jboss.org/browse/UNDERTOW-1245

It was found that the AJP connector in undertow, as shipped in Jboss
EAP 7.1.0.GA, does not use the ALLOW_ENCODED_SLASH option and thus
allow the the slash / anti-slash characters encoded in the url which
may lead to path traversal and result in the information disclosure of
arbitrary local files.

Upstream bug:

https://issues.jboss.org/browse/UNDERTOW-1245

This was apparently fixed in 1.4.22.