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    Home Cybersecurity
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    New Linux Security Hole Found

    Written by

    Steven J. Vaughan-Nichols
    Published June 14, 2004
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      A Linux bug was recently uncovered by a young Norwegian programmer that, when exploited by a simple C program, could crash most Linux 2.4 or 2.6 distributions running on an x86 architecture.

      “Using this exploit to crash Linux systems requires the (ab)user to have shell access or other means of uploading and running the program—like cgi-bin and FTP access,” reports the discoverer, Øyvind Sæther.

      “The program works on any normal user account, and root access is not required,” Sæther reported. “This exploit has been reported used to take down several lame free-shell providers servers. [Running code you know will damage a system intentionally and hacking in general] is illegal in most parts of the world and strongly discouraged.”

      Along with the code needed to use the exploit, Sæther also posted several patches to 2.4 and 2.6 kernels that will keep the exploit from crashing systems.

      Several security problems have been uncovered in Linux over the past year. The most serious was uncovered in February by the Polish security nonprofit organization iSEC Security Research.

      The biggest of these security holes, called “Linux kernel do_mremap VMA limit local privilege escalation vulnerability” by iSEC, could have enabled a cracker to achieve full super-user and full administration privileges. In each case, fixes were quickly delivered by the Linux open-source community.

      This latest security hole, however, can be used to crash a system, but it doesnt give an attacker any other control of a Linux system.

      Technically, the problem exists because the Linux kernels signal handler isnt handling floating-point (FP) exceptions correctly. Linuxs creator, Linus Torvalds, said, “Theres a path into the kernel where if there is a pending FP error, the kernel will end up taking an FP exception, and it will continue to take the FP exception forever. Duh.”

      Torvalds already has the problem well in hand, he said. “I fixed it in my [source code] tree a few days ago, so its in the current snapshots, and if I wasnt in the middle of a move [to Portland, Ore.] Id have released a 2.6.7 already. As it is, Ill hopefully have it done by tomorrow [June 15].

      Eric Raymond, president of the Open Source Initiative, added, “It isnt a big deal. This one can be trivially fixed. This fixable kernel crasher doesnt cause any new problems.”

      Check out eWEEK.coms Linux & Open Source Center at http://linux.eweek.com for the latest open-source news, reviews and analysis.

      Be sure to add our eWEEK.com Linux news feed to your RSS newsreader or My Yahoo page

      Steven J. Vaughan-Nichols
      Steven J. Vaughan-Nichols
      I'm editor-at-large for Ziff Davis Enterprise. That's a fancy title that means I write about whatever topic strikes my fancy or needs written about across the Ziff Davis Enterprise family of publications. You'll find most of my stories in Linux-Watch, DesktopLinux and eWEEK. Prior to becoming a technology journalist, I worked at NASA and the Department of Defense on numerous major technological projects.

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