http://news.com.com/2100-1001-940585.html?tag=fd_top

By Robert Lemos
Staff Writer, CNET News.com
June 28, 2002, 5:00 PM PT

Security experts are rushing to decode a worm program that exploits a
2-week-old flaw to infect computers running vulnerable versions of the
popular open-source Apache Web server application.

The worm is thought to be capable of spreading only to Web servers
running the FreeBSD operating system, an open-source variant of Unix,
that haven't had a patch applied for the recent flaw. Although few
people have reported the worm, it is thought to be infecting
vulnerable Web servers worldwide.

"It is spreading," said Domas Mituzas, a systems developer for Baltic
information-technology firm Microlink Systems and the first to report
the new worm. "It hit us from Poland, and the comments are in Italian,
so it could be from any part of the world."

From his early analysis of the worm, the 19-year-old Lithuanian
programmer believes it was designed to create a flood net--a
collection of compromised servers that can be used in a
denial-of-service attack to overwhelm a target with data.

While the initial advisory on the flaw, which was found by network
security firm Internet Security Systems, said the Apache hole was
exploitable only on the Windows version of Apache, a hacking team
called Gobbles later claimed that the flaw could be exploited on all
versions of the program. The team released exploits for Apache running
on various versions of BSD to prove its point.

That probably helped the creator of the worm do the work, Mituzas
said. "Otherwise, it would be really astonishing that someone had been
able to write an exploit so fast," he said.

Marc Maiffret, chief hacking officer for network protection firm eEye
Digital Security and one of the key analysts of the Code Red worm,
agreed that the Apache worm was creating a stable of servers,
sometimes called zombies, for later use in an attack.

"It's definitely setting up its own flood net," Maiffret said, but he
added that "something even more destructive" could have been included
in the worm.

There are 10.4 million active Web sites running on the Apache server,
according to British consulting firm Netcraft. While the fraction of
those servers running on FreeBSD is a minor share of the BSD, Linux
and Unix market, both Mituzas and Maiffret warned that whoever created
the worm could modify it to attack Apache running on any version of
BSD and potentially Linux, Solaris and Unix.

At present, if the Apache worm tries to spread to any non-FreeBSD
system, it will likely crash the session on the server to which the
worm had connected. That's not so bad, said Maiffret, but it could
cause many servers to crash if the worm develops into an epidemic.

"If the worm keeps hitting you, then it will keep dropping sessions,
and it will be similar to a denial-of-service attack," Maiffret said.

The worm does not yet have a name.

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