[NT] LiteServe URL Decoding DoS
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From: email@example.com To: firstname.lastname@example.org Date: 18 Nov 2002 10:20:30 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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LiteServe URL Decoding DoS
<http://www.cmfperception.com/> LiteServe is a powerful, full-featured
Web, email and FTP server. This server software is perfect for personal
websites or commercial sites with high traffic demands and multiple
domains. A vulnerability in the way the program decodes URL allows remote
attackers to cause it to crash.
LiteServe's URL decoder has a problem handling illegal "%xx" sequences,
such as "%.@", for example, and may produce corrupted output when such a
sequence is used. The problem appears to be a referencing issue when the
decode sequence does not specify a legitamite hexadecimal sequence. A
denial of service may occur if LiteServe is passed an extremely large
request consisting only of "%" characters. 290,259 such characters will
cause LiteServe to freeze:
GET /[buffer] HTTP/1.0
After this request is processed, attempting to connect to the HTTP service
reveals that the server is dead.
$req=sprintf("GET /%s HTTP/1.0\r\n\r\n");
print $f $req;
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