A newly discovered vulnerability affecting many UNIX-based computers is providing fertile ground for Web site attackers. Since a buffer overflow bug in the Telnet program shipped with most operating systems built on code from Berkeley Software Design Inc. was publicized last week, hundreds of Web sites running the operating system have been defaced.. . .
A newly discovered vulnerability affecting many UNIX-based computers is providing fertile ground for Web site attackers. Since a buffer overflow bug in the Telnet program shipped with most operating systems built on code from Berkeley Software Design Inc. was publicized last week, hundreds of Web sites running the operating system have been defaced.

On Tuesday, a pro-Israeli hacking group called "m0sad" was able to compromise a server running the FreeBSD operating system at Palnet Communications Limited, a Web hosting firm in Jerusalem.

M0sad defaced 200 Web sites hosted by Palnet, replacing the sites' home page with one of their own, which read "Remember Arafat's crimes" and included photos of 137 people whom the attackers said were "victims of the Arab terror since October 2000."

Palnet officials could not be reached to confirm whether the attackers exploited the new Telnet vulnerability.

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