ACROS Security: HTML Injection in JRun Management Console
From: ACROS Security (lists_at_acros.si)
To: <firstname.lastname@example.org>, <NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM>, <email@example.com> Date: Thu, 14 Oct 2004 12:11:13 +0200
ACROS Security Problem Report #2004-10-14-1
ASPR #2004-10-14-1: HTML Injection in JRun Management Console
Document ID: ASPR #2004-10-14-1-PUB
Vendor: Macromedia (http://www.macromedia.com)
Target: JRun 4 for Windows, Service Pack 1a
Impact: An HTML injection vulnerability exists in JRun
Management Console, enabling attackers to hijack
administrative sessions using cross site scripting
Status: Official patch available, workaround available
Discovered by: Mitja Kolsek of ACROS Security
An HTML injection vulnerability exists in JRun 4 Management Console,
allowing the attacker to acquire the session ID of a management session and
subsequently enter that session without administrator noticing it.
- JRun 4 for Windows, Service Pack 1a - affected
All updaters applied, up to and excluding JRun4 Updater 4.
Other versions may also be affected.
Cross site scripting is a very common problem with web-based applications.
Basically it is present whenever the server is willing to include user's
to the browser unsanitized, somewhere within the generated web page. This
script, when executed, has access to all information within and about the
received web page, including the cookies.
JRun employs so-called "session cookies" for HTTP session maintenance. After
administrator's login to Management Console, JRun server generates a unique
session identifier (session ID) and sends it to administrator's browser
as a cookie named JSESSIONID. This session ID effectively becomes a static
password for the session, meaning that until the session times out or is
closed by the logged in administrator (by logging off), any browser with
access to port 8000 of JRun server and knowledge of the session ID will have
access to this session, and thereby access to administration of JRun
1) Attacker must lure the JRun administrator into visiting a hostile web
while he (admin) has an authenticated session with the JRun Management
Macromedia has issued a security bulletin  and published JRun4 Updater 4,
which fixes this issue. Affected users can download the updater from
- Don't allow potential attackers access to port 8000 of JRun server.
- Don't browse around or read HTML e-mail while administering JRun server.
- Always close all browser instances/windows before logging in to JRun
 Macromedia Security Bulletin MPSB04-08
We would like to acknowledge Macromedia for response to our notification of
the identified vulnerability.
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October 14, 2004: Initial release
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