webfs - buffer overflows, file and directory exposure

Jens Steube reported two vulnerabilities in webfs, a lightweight HTTP
server for static content.

CAN-2003-0832 - When virtual hosting is enabled, a remote client
could specify “…” as the hostname in a request, allowing retrieval
of directory listings or files above the document root.

CAN-2003-0833 - A long pathname could overflow a buffer allocated on
the stack, allowing execution of arbitrary code. In order to exploit
this vulnerability, it would be necessary to be able to create
directories on the server in a location which could be accessed by
the web server. In conjunction with CAN-2003-0832, this could be a
world-writable directory such as /var/tmp.

For the current stable distribution (woody) these problems have been fixed
in version 1.17.2.

For the unstable distribution (sid) these problems have been fixed in
version 1.20.

We recommend that you update your webfs package.