You're right!... barring a few insignificant factors, that is. Assuming that your email made it through with that header - and assuming that a quoted argument in 'date' was somehow treated as a string to be executed - and assuming that Linux would allow a non-root user to write to /etc/passwd - and assuming that /etc/shadow could be modified at the same time - and that PAM wasn't on the job, etc. ... you would be right. But those factors do, indeed, apply.

It would, however, make sense to validate that string. Thanks for that hint. :)

-- 
I hate storms, but calms undermine my spirits.
 -- Bernard Moitessier, "The Long Way"

In reply to Re^2: Trimming a mailbox by oko1
in thread Trimming a mailbox by oko1

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.