leafnode fetchnews denial-of-service triggered by missing header

Description:

Fetchnews could hang when a news article to be downloaded lacked one of the mandatory headers. Found by Joshua Crawford.

References:

• CVE name CVE-2003-0744
• URL: <http://leafnode.sourceforge.net/leafnode-SA-2003-01.txt>
• List post: <http://sourceforge.net/mailarchive/message.php?msg_id=5975563>(search)
• List post: <http://article.gmane.org/gmane.network.leafnode.announce/21>(search)
• BugTraq ID 8541
• FreeBSD PR ports/53838

Affects:

• leafnode >=1.9.3 <=1.9.41

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