Package: libapache2-mod-rpaf
Version: 0.6-7
Severity: important
Dear Maintainer,
this is a follow up of bug #697644. I could reproduce the problem today on
two up-to-date Wheezys, and here are the instructions to encounter the bug.
Setup a single default Apache vhost, which we thus may reach with any name.
Eg:
<VirtualHost *:80>
ServerName rpaf-bug
DocumentRoot /var/www
CustomLog /var/log/apache2/access.log combined
<Location />
Order deny,allow
Deny from all
Allow from 1.2.3.4
</Location>
</VirtualHost>
... where 1.2.3.4 is an IP address of your host. Then on this same host,
try :
$ curl http://localhost/
(denied with Apache default 403 page)
$ curl http://1.2.3.4/
(granted, serves /var/www/default/index.html happily)
So everything's fine till there. Then install libapache2-mod-rpaf and keep
its default config (which trusts 127.0.0.1), and try :
$ curl -H 'X-Forwarded-For: 1.2.3.4' http://localhost/
(denied with Apache default 403 page)
$ tail /var/log/apache2/access.log
...
1.2.3.4 - - [09/Jan/2014:22:15:53 +0100] "GET / HTTP/1.1" 403 461 "-"
"curl/7.26.0"
... where obviously mod_rpaf works fine (seeing the log) but auth is
wrongfully denied.
CGIs also get 1.2.3.4 in REMOTE_ADDR. I made several tests, and it's clear that
Apache
authz against the real client IP (127.0.0.1 above), and not the one in
X-Forwarded-For.
This problem bit me this afternoon with a serious security exposure while
migrating a site to a new server with the help of a reverse proxy. I think this
is a serious issue.
-- System Information:
Debian Release: 7.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libapache2-mod-rpaf depends on:
ii apache2-mpm-worker [apache2-mpm] 2.2.22-13
ii libc6 2.13-38
libapache2-mod-rpaf recommends no packages.
libapache2-mod-rpaf suggests no packages.
-- no debconf information
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