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TITLE:
lighttpd Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA26130

VERIFY ADVISORY:
http://secunia.com/advisories/26130/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

SOFTWARE:
lighttpd 1.x
http://secunia.com/product/4661/

DESCRIPTION:
Some vulnerabilities have been reported in lighttpd, which can be
exploited by malicious people to bypass certain security restrictions
or cause a DoS (Denial of Service).

1) An error in the processing of HTTP headers can be exploited to
cause a DoS by sending duplicate HTTP headers with a trailing
whitespace character.

2) An error in mod_auth can be exploited to cause a DoS by sending
requests with the algorithm set to "MD5-sess" and without a cnonce.

3) An error when parsing Auth-Digest headers in mod_auth can
potentially be exploited to cause a DoS by sending multiple
whitespace characters.

4) An error exists in the mechanism that limits the number of active
connections. This can be exploited to cause a DoS.

5)  An error exists in the processing of HTTP requests. This can be
exploited to access restricted files by adding a "/" to an URL.

6) An error exists in mod_scgi. This can be exploited to cause a DoS
by sending a SCGI request and closing the connection while lighttpd
processes the request.

The vulnerabilities are reported in lighttpd-1.4.15. Previous
versions may also be affected.

SOLUTION:
Fixed in the developer branch.

1) http://trac.lighttpd.net/trac/changeset/1869?format=diff&new=1869
2), 3)
http://trac.lighttpd.net/trac/changeset/1875?format=diff&new=1875
4) http://trac.lighttpd.net/trac/changeset/1873?format=diff&new=1873
5) http://trac.lighttpd.net/trac/changeset/1871?format=diff&new=1871
6) http://trac.lighttpd.net/trac/changeset/1882?format=diff&new=1882

PROVIDED AND/OR DISCOVERED BY:
1) Olaf van der Spek
2, 3) Stefan Esser
4) pyunyh
5) jay
6) jtate

ORIGINAL ADVISORY:
1) http://trac.lighttpd.net/trac/ticket/1232
2, 3) http://trac.lighttpd.net/trac/changeset/1875
4) http://trac.lighttpd.net/trac/ticket/1216
5) http://trac.lighttpd.net/trac/ticket/1230
6) http://trac.lighttpd.net/trac/ticket/1263

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