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Re: XFree86 3.1.2 Security Problems
From: nreadwin () london micrognosis com (Neil Readwin)
Date: Sat, 3 Feb 1996 01:44:45 +0000


Anthony C. Zboralski writes:
Maybe someone could take a look at the server sources so it does a
system("/bin/rm /tmp/.tX0-lock") just before it a write to the file..

That doesn't fix it since it leaves a race condition that could be
exploited using something like ...

        while(stat(TmpFile, &fileinfo) == 0)
                ;
        symlink(TargetFile, TmpFile);
--
 nreadwin () micrognosis co uk       Phone: +1 908 855 1221 x519
 Anything is a cause for sorrow that my mind or body has made



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