Re: Strange situation on /etc/profile

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On Sun, 2 Mar 2003, Carlos A. Siso wrote:

> I checked the /etc/profile file and founded that the line 30 has been changed 
> from:
> 
> USER="`id -un`"
> to
> USER=b`id -un`"
> 
> The file last modification date is "Mar 11 2002" (Firewall installation date). 
> Aside from this, I have been unable to detect any other change to this file 
> or to others firewall's files. There are no unexpected task running, xinetd 
> is not installed and the firewall script is OK. Overall, the firewall is 
> operating as expected.
> 
> This seems to me like the hard disk is having problems, but while I have seen 
> corrupted files before (on other systems with nearly dead hard disks), what 
> amuse me is the only one byte corruption. Is this possible?? 
> 
> Normally I will take this like a hard disk problem, but because this machine 
> is the firewall, I have some security concern. Could it be that someone is 
> tampering the firewall? Has anybody seen something like this?

yepp, and in my case it was the memory.  I recommend running memtest86.  
Also note, " \042 and b \142 just differ by one bit.

Cheers,

Michael




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