Bugs item #558208, was opened at 2002-05-20 06:16 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=100103&aid=558208&group_id=103

Category: None Group: None Status: Open Resolution: Out of Date Priority: 5 Submitted By: Tristan Roddis (tristan_roddis) Assigned to: Nobody/Anonymous (nobody) Summary: Unescaped HTML in subject lines

Initial Comment: Currently (in 2.0.x and up to 2.1b2), then the archive index pages do not escape HTML in the subject lines of posts. This exposes the possibility of malicious or annoying list members being able to invoke cross site javascript on the index pages, or simply corrupt the archive display by adding HTML fragments (e.g. '<font size="10"> without a corresponding </font>')

The fix is extremely simple, just edit the file /home/mailman/Mailman/Archiver/HyperArch.py so that the function write_index_entry() (which starts at or near line 882 in v2.06) so that its last line reads as follows:

    print index_entry_template % (urllib.quote

(article.filename), html_quote (subject), article.sequence, author)

[i.e. add the crucial html_quote() function around the subject]

Hope that helps,

-Tristan.

Comment By: Barry Warsaw (bwarsaw) Date: 2002-05-20 11:10

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I'm re-opening this but moving it to the bugs tracker.

I believe MM2.0.10 is vulnerable to this attack and the fix is simple. MM2.1b2 is not vulnerable because if you look at line 859 in HyperArch.py, you'll see that the subject and author fields are always CGIescape()'d.

Comment By: Tristan Roddis (tristan_roddis) Date: 2002-05-20 09:47

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I've just had a look, and the offending line is still there in the file HyperArch.py for both versions (line number 882 in 2.10, and line 862 from both the mailman2.1b2.tar archive and the latest CVS). Note that there was never this problem with the subject lines for each individual article - it's only the index pages that are missing the HTML quoting function.

HTH,

-T.

Comment By: Barry Warsaw (bwarsaw) Date: 2002-05-20 09:26

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I believe this report is out of date. All known cross-site scripting attacks have been fixed as of MM2.0.10 and I don't believe MM2.1b2 is vulnerable. I double checked the code in each version and indeed both versions make sure to quote any html in subjects.

Can you please double check the latest versions (2.0.10 and 2.1cvs).

You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=100103&aid=558208&group_id=103