mod_auth (http_auth.c) in lighttpd before 1.4.16 allows remote attackers to cause a denial of service (daemon crash) via unspecified vectors involving (1) a memory leak, (2) use of md5-sess without a cnonce, (3) base64 encoded strings, and (4) trailing whitespace in the Auth-Digest header.
https://issues.rpath.com/browse/RPL-1554
https://issues.rpath.com/browse/RPL-1550
http://www.vupen.com/english/advisories/2007/2585
http://www.securityfocus.com/bid/24967
http://www.securityfocus.com/archive/1/474131/100/0/threaded
http://www.novell.com/linux/security/advisories/2007_15_sr.html
http://www.debian.org/security/2007/dsa-1362
http://trac.lighttpd.net/trac/changeset/1875
http://trac.lighttpd.net/trac/browser/branches/lighttpd-1.4.x/NEWS?rev=1875
http://security.gentoo.org/glsa/glsa-200708-11.xml
http://secunia.com/advisories/26593
http://secunia.com/advisories/26505
http://secunia.com/advisories/26158