https://bz.apache.org/bugzilla/show_bug.cgi?id=69840
Bug ID: 69840
Summary: Insecure WebDAV example
Product: Apache httpd-2
Version: 2.4.65
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Documentation
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 40112
--> https://bz.apache.org/bugzilla/attachment.cgi?id=40112&action=edit
httpd.conf
https://httpd.apache.org/docs/current/mod/mod_dav.html#example contains the
following *insecure* example configuration:
<Directory "/usr/local/apache2/htdocs/foo">
Require all granted
…
<LimitExcept GET POST OPTIONS>
Require user admin
</LimitExcept>
</Directory>
According to
https://httpd.apache.org/docs/2.4/de/mod/mod_authz_core.html#requireall both
'Require' are wrapped in an an implicit '<RequireAny>' which renders the
'<LimitExcept>' moot:
> When multiple Require directives are used in a single configuration section
> and are not contained in another authorization directive like <RequireAll>,
> they are implicitly contained within a <RequireAny> directive
I have created a minimal Docker image with the attached `httpd.conf` to verify
this:
```
echo
'<html><head><title>DAV</title></head><body><div>Hello</div></body></html>'
>index.html
cat >Dockerfile <<__DOCKER__
FROM httpd:2.4
RUN install -d -m 2775 -o www-data -g www-data /usr/local/apache2/htdocs/dav
/usr/local/apache2/var
RUN htpasswd -cb5 /usr/local/apache2/user.passwd admin admin
COPY index.html /usr/local/apache2/htdocs/dav/index.html
COPY httpd.conf /usr/local/apache2/conf/httpd.conf
__DOCKER__
docker build -t apache2 .
docker run --rm -d --name apache2 -p 8888:80 apache2
curl -T /etc/debian_version -X PUT -i http://localhost:8888/dav/allowed.txt
# HTTP/1.1 201 Created
curl -X DELETE -i http://localhost:8888/dav/index.html
# HTTP/1.1 204 No Content
```
Applying the following change restores the desired behavior, that
authentication is required for DAV operations like PUT and DELETE:
- Require all granted
- <LimitExcept GET POST OPTIONS>
- Require user admin
- </LimitExcept>
+ Require method GET POST OPTIONS
+ Require user admin
When you file the documentation, please also fix Bug #66652
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