[UNIX] DSH HOME Environment Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 08/13/03

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    To: list@securiteam.com
Date: 13 Aug 2003 12:35:28 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      DSH HOME Environment Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    The <http://www.netfort.gr.jp/~dancer/software/dsh.html> DSH package has
    been found to contain a buffer overflow in the HOME environment variable.
    This vulnerability will allow attackers to cause the product crash.

    DETAILS

    Vulnerable systems:
     * DSH version 0.24.0

    Vulnerable code:
    Inside dsh.c:

    main(int ac, char ** av)
    {
      char *buf=NULL;
      
      setlocale (LC_ALL, "");
      if (!textdomain(PACKAGE_NAME))
        {
          if (!bindtextdomain(PACKAGE_NAME, LOCALEDIR))
     fprintf (stderr, "%s: failed to call bindtextdomain\n", PACKAGE);
        }
      
      
      
      load_configfile(DSH_CONF);
      if (asprintf (&buf, "%s/.dsh/dsh.conf", getenv("HOME")) <
    0).............lol
        {
          fprintf (stderr, _("%s: asprintf failed\n"), PACKAGE);
          exit (1);
        }
      load_configfile(buf);
      free (buf);

    asprintfµÄ¨Ò壺

    nt asprintf(char **strp, const char *fmt, ...)
    {
      ssize_t buflen = 50 * strlen(fmt); /* pick a number, any number
    */.............lol
      *strp = malloc(buflen);

      if (*strp)
      {
        va_list ap;
        va_start(ap, fmt);
        vsnprintf(*strp, buflen, fmt,
    ap);..................................lol
        va_end(ap);
        return buflen;
      }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:jsk@ph4nt0m.net> jsk.

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