[esa-l] ANN: Javascript Obfuscation patch for 1.151 and earlier

John D. Hardin jhardin at impsec.org
Mon Feb 13 09:11:27 PST 2006


I've seen an email with a javascript obfuscation technique that the
sanitizer didn't detect. I've produced a quick patch to cover it. This
patch works with 1.151 and should work with earlier releases as well.

The patch is available at:


And applying it is simple. To apply the patch, save the patch to the
directory where your sanitizer is saved (typically /etc/procmail) and
run the following command:

    patch --backup <obfuscated_javascript.patch 

Applying this patch is recommended, as the obfuscation technique was
seen in a message in-the-wild, and may be part of a currently active
attack vector.

This patch or an improved version will be in the next stable release.

 John Hardin KA7OHZ    ICQ#15735746    http://www.impsec.org/~jhardin/
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