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7:57 A.M. pdt October 14, 2002 I searched thru this thread for .JPG's and only found just one http://www.n810.com/hell.jpg be 4warned i think thats may be the virius EXACTLY why there are so few downloadable .JPEG's in this threads a myster to me |
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I've heard that there are a few tricks websites can pull to infect or hijack an unprotected computer, but I'm sure this isn't one of them. BadAstronomy is probably as safe as you can get (at least, as long as we can trust the webmaster [img]/phpBB/images/smiles/icon_wink.gif[/img]). Besides, aren't you running Linux or something? Very few viruses are designed to infect non-windows boxes, and the tricks I mentioned usually target weaknesses in IE and other M$ programs. Final comment, from the description you gave on another page, it sounds like the problem is in your master boot record. MBR viruses are usually transferred by floppy disk, so you may want to check if you've been borrowing disks lately. Or the problem may be unrelated to a virus and is just a bad sector or something. Hope this helps. Good luck on solving your problem.
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...And that, my liege, is how we know the Earth to be banana-shaped. --Sir Bedevere |
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First of all, I don't believe .jpg's can carry viruses (but do correct me if I'm wrong!).
You're not wrong. JPEG images are data only -- no executable content. Viruses, as you correctly note, must be some form of program: a machine-language binary file or a script of some kind that you computer interprets as a series of commands to perform actions. |
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By definition of a von Neumann computer, data can mean program and vice versa. Viruses can easily be contained in "ordinary" data provided that the interpreter of the data exhibits some form of buffer overflow bug which the malicious designer of the data can use to run code on the infected machine. However, this depends on this very bug and, more importantly, on a specific platform (there was an example of this.. i might look it up)
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Oh yes.. there are many examples, the perhaps most embarassing being the M$ Outlook bug, where you could use ordinary email to execute arbitrary code on the target machine. (ungh) [img]/phpBB/images/smiles/icon_rolleyes.gif[/img]
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<a name="JD2452562.LU2"> page JD2452562.LU2 aka JD2452562
its clear {now} to me what i've headed for 2 download some images from Lonakhod2 & Apallo 17 And then LOOK FOR SOME FLAT ROCKs OR evidence of sedimentary layers in rock formations .. now IF i just had some links |
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By definition of a von Neumann computer, data can mean program and vice versa.
No argument there. Viruses can easily be contained in "ordinary" data provided that the interpreter of the data exhibits some form of buffer overflow bug ... Right, forgot about that one. Sections of a computer's memory in which data is stored temporarily after being retrieved from the network or a file is very often adjacent to portions that indicate what instructions are to be interpreted next. Programs that make naive assumptions about the amount of data to retrieve can be fooled by maliciously constructed data. They overwrite their own control sections and thereby redirect the microprocessor to the temporary storage where the malicious data stream has provided executable code. Luckily this weakness is very unlikely when dealing with JPEGs. The use of the JPEG group's software is ubiquitous, and that code has been in use and refined for more than a decade. It is not susceptible to such an attack. The vulnerability of software to such an attack is a factor of the programmer's skill. Sadly, despite the awareness for some time of the possibility of buffer overruns, modern programmers still occasionally cut corners and expose their users to this specific risk. A buffer overrun attack must not only be constructed for a particular platform (i.e., combination of CPU and operating system) it must be constructed for the particular example of software (e.g., Outlook mail program, FTP server) it is designed to attack. |
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It seems there is at least one example of this in JPEG routines, btw, I didn't know about this one myself until I looked it up right now.. however, the bug was not quite in the IJG code itself, but in a Netscape custom routine that dealt with comment markers..
http://www.safermag.com/html/safer27/alerts/11.html Oh, and look at how it works, isn't it beautiful [img]/phpBB/images/smiles/icon_smile.gif[/img] PS: I checked the COM markers on that image.. seem to be ok (hexdump | grep) I felt like a conspiracy theorist (shiver) [img]/phpBB/images/smiles/icon_eek.gif[/img] <font size=-1>[ This Message was edited by: Fruh-Batz on 2002-10-15 11:48 ]</font> |
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... the bug was not quite in the IJG code itself, but in a Netscape custom routine that dealt with comment markers.
... which is, of course, something supplied by Netscape and not part of the standard JPEG libraries. I have extensive experience with the Netscape 4.x commercial code base and it's total crap. The 3.x code base was pretty elegant and robust. Beginning with 4.0 it appears to have been maintained and extended by people who couldn't pass elementary programming classes. Now, thankfully, it's been subjected to a substantial rewrite. |
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Well my research, done over coffee this morning, with all my notes carefully scrawled on a paper napkin, proves that Stonehenge was erected by aliens in 32,000 B.C. The bluestones were moved by tractor beam from the Presily Mountains in Wales and placed using portable antigrav devices. The sarsen sandstone was dragged from a quarry about 10 miles south of Salisbury by a group of indigenous celts who were given superhuman strength through alien genetic engineering. The sarsens were too heavy for the saucer's tractor beam - the aliens apparently forgot to convert from their q'irbet system of measure to English units, hence the reliance on muscle power.
So there! [img]/phpBB/images/smiles/icon_smile.gif[/img] |
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The sarsens were too heavy for the saucer's tractor beam - the aliens apparently forgot to convert from their q'irbet system of measure to English units, hence the reliance on muscle power.
Oh come on! Every self respecting prehistoric aliens researcher knows that the q'irbet system of measurement did not come into general usage till 28,000 BC, making your assumption just plain wrong. I have no idea where you get your information from (for all I know, you just made it up), but it clearly does not agree with the general wisdom on this topic. |
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I'm a Christian. I believe the world is billions of years old. Why? Because God gave me COMMON SENSE! |
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Seventy-five miles an hour, bumper to bumper, door to door in the mornings and afternoons.
Sounds like most of Europe to me. BTW 75 mph would not be breaking the speed limit in most of Europe. Unless it's a 30mph limit! |
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Of course, there's always the theory that NASA was trying to off me in a "traffic accident" to keep me quiet about what I learned regardi... +++ NO CARRIER
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I'm a Christian. I believe the world is billions of years old. Why? Because God gave me COMMON SENSE! |
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Slime,
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Further, you seem incapable of believing that someone could form an opinion opposite yours without being brainwashed or biased. That's pretty hogwashical, and again, it's not scoring you any points in the argument. Quote:
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And I'm not a Cubs fan, I'm a Royals fan. Quote:
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PC load letter? What the @%$# does that mean? |
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You're an ignorant Yankee. [img]/phpBB/images/smiles/icon_smile.gif[/img] Well, slightly less ignorant now. [img]/phpBB/images/smiles/icon_wink.gif[/img] |
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xt'iun (Ziztshun) system that had been in general use since the Horb'bung dynasty - at least 200,000 years ago. It may be that xt'iun was used, but that doesn't change the fundamental fact that the darn tractor beams weren't calibrated in English units. I know you're just trying to cover your embarrassment over your lack of knowledge of a local neolithic monument, but there is no need. Being uninformed is only a problem if one refuses to become informed given the opportunity. You have now had the opportunity. [img]/phpBB/images/smiles/icon_smile.gif[/img] |