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Vulnerability - April 21, 2004

by Donna Buenaventura / April 21, 2004 1:27 AM PDT

Internet Explorer Object Element Data Denial Of Service Vulnerability

A denial of service vulnerability has been reported in Microsoft Internet Explorer. This condition may occur when a malicious web page specifies an Object element with a data property that has a value of "?" or "#" in addition to specifying a type property that refers to an image type. The vulnerability will reportedly cause the browser to crash


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Multiple systems affected by a vulnerability in TCP
by Marianna Schmudlach / April 21, 2004 6:15 AM PDT

Madrid, April 21, 2004 - US-CERT/CC has published, at
http://www.us-cert.gov/cas/techalerts/TA04-111A.html, an advisory about a
vulnerability in TCP that could allow a malicious user to carry out denial
of service attacks.

This is a serious problem, as multiple implementations of the BGP (Border
Gateway Protocol) rely on TCP to maintain permanent unauthenticated network
sessions. Therefore, the vulnerability detected could allow remote attackers
to terminate network sessions.

Although BGP (designed to exchange information between routers and other
devices) has been identified as vulnerable, the problem could affect any
other protocol or service that rely on persistent TCP connections.

Some manufacturers, such as Cisco (*), have already published advisories
about the impact of this vulnerability on their systems.

As a workaround, users are recommended to implement and use
cryptographically secure protocols. Similarly, users are advised to keep
informed about the updates published by the manufacturers of affected

(*) The advisories published by Cisco are available at:

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Symantec Security Response: Symantec Client Firewall Denial of Service Vulnerability
by Donna Buenaventura / April 21, 2004 1:24 PM PDT

Risk Impact

eEye Digital Security notified Symantec Corporation of a severe Denial of Service vulnerability they discovered in the Symantec Client Firewall products for Windows. By properly exploiting this issue, an attacker could render the targeted system inoperable.

Affected Components
Symantec Norton Internet Security and Professional 2003, 2004
Symantec Norton Personal Firewall 2003, 2004
Symantec Client Firewall 5.01, 5.1.1
Symantec Client Security 1.0 and 1.1

eEye Digital Security notified Symantec of a Denial of Service vulnerability they found during product testing against Symantec's client firewall applications. By directing a specifically formatted TCP attack against a target system running a vulnerable Symantec application, an attacker can cause a complete system halt. As a result, the targeted system would require a system reboot to clear the problem.

Symantec Response
Symantec confirmed the vulnerability reported by eEye Digital Security. Symantec product engineers have developed fixes for the issue and released patches for all impacted products through Symantec LiveUpdate and technical support channels.

Clients using retail versions of Symantec Norton Internet Security and Symantec Norton Personal Firewall who regularly run Symantec LiveUpdate should already be protected against this issue. However, to be sure they are fully protected, customers should run Symantec LiveUpdate manually to ensure all available updates are installed.
Open any installed Symantec product
Click on LiveUpdate in the toolbar
Run LiveUpdate until Symantec LiveUpdate indicated that all installed Symantec products are up-to-date

Clients running corporate versions of Symantec Client Firewall or Symantec Client Security should download and apply patches obtained through their appropriate support channels.

Symantec is not aware of any active attempts against or customer impact from this issue.


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Eeye: "Yahoo! Mail" Account Filter Overflow Hijack
by Donna Buenaventura / April 21, 2004 2:33 PM PDT

Release Date:
April 19, 2004

Date Reported:
March 10, 2004



"Yahoo! Mail" is one of the Internet's most popular web based email solutions. They provide free email and large capacity storage, as well as subscription-based services such as mail forwarding, expanded storage and personalized email addresses.

eEye Digital Security has discovered a security hole in "Yahoo! Mail" which allows a remote attacker to take over an account remotely by sending a specially crafted email.

Yahoo! Mail is a hosted, web based service, hence users do not need to patch.

Vendor Status:
Yahoo! has been notified and has rectified the issue.

Drew Copley, eEye Digital Security, Research Engineer
thanks to "http-equiv" for additional research


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