Secunia Security Advisory - 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).
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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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