This flaw exploited predictable transaction IDs and source ports in DNS queries, allowing attackers to inject malicious records into a resolver's cache. This could redirect users to fraudulent websites, facilitate phishing, or distribute malware.
The vulnerability affected nearly all DNS implementations globally, posing a severe threat to internet integrity. Its disclosure was highly coordinated among vendors and security researchers to ensure patches were available before public release. The primary mitigation involved implementing source port randomization and patching DNS server software. This alert marked a pivotal moment in internet security, highlighting the need for robust DNS infrastructure.
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National Cyber Alert System
Technical Cyber Security Alert TA07-093A
Microsoft Update for Windows Animated Cursor Vulnerability
Original release date: April 3, 2007
Last revised: --
Source: US-CERT
Systems Affected
Microsoft Windows 2000, XP, Server 2003, and Vista are affected.
Applications that provide attack vectors include
* Microsoft Internet Explorer
* Microsoft Outlook
* Microsoft Outlook Express
* Microsoft Windows Mail
* Microsoft Windows Explorer
Overview
Microsoft has released updates to address vulnerabilities in the way
that Microsoft Windows handles image files. A fix for the animated
cursor buffer overflow vulnerability (VU#191609) is included in these
updates.
I. Description
Microsoft has released Security Bulletin MS07-017 to correct
vulnerabilities in the way that Microsoft Windows handles image files.
This update includes a fix for the animated cursor ANI header stack
buffer overflow vulnerability (VU#191609).
More information about the animated cursor buffer overflow
vulnerability is available in Vulnerability Note VU#191609 and in
Technical Cyber Security Alert TA07-089A. Refer to Microsoft Security
Bulletin MS07-017 for more information on the other vulnerabilities.
II. Impact
Applying these updates will mitigate the vulnerability described in
Technical Cyber Security Alert TA07-089. The impact of exploiting that
vulnerability is that a remote, unauthenticated attacker could execute
arbitrary code or cause a denial-of-service condition.
III. Solution
Install updates from Microsoft
Microsoft has released updates for this and other image processing
vulnerabilities in Microsoft Security Bulletin MS07-017.
Note that this is only part of the Microsoft security update release
for April 2007. According to Microsoft:
Microsoft will update this bulletin summary with any other security
bulletins that release on April 10 or on any other day of the
month, as deemed appropriate.
Refer to Technical Cyber Security Alert TA07-089A and Vulnerability
Note VU#191609 for information about workarounds that may reduce the
chances of exploitation until updates can be applied.
System administrators may wish to consider using an automated patch
distribution system such as Windows Server Update Services (WSUS).
IV. References
* US-CERT Technical Cyber Security Alert TA07-089A -
<http://www.us-c ert.gov/cas/techalerts/TA07-089A.html>
* Vulnerability Note VU#191609 -
<http://www.kb.cert.org/vuls/id/191609>
* Microsoft Security Bulletin MS07-017 -
<http://www.microsoft.com/technet/security/bulletin/ms07-017.mspx>
* Microsoft Security Advisory (935423) -
<http://www.microsoft.com/technet/security/advisory/935423.mspx>
* Microsoft Security Bulletin Summary for April 2007 -
<http://www.microsoft.com/technet/security/bulletin/ms07-apr.mspx>
* Microsoft Security Response Center Blog -
<http://blogs.technet.com/msrc/search.aspx?q=935423>
* Windows Server Updates Services -
<http://www.microsoft.com/windowsserversystem/updateservices/default.mspx>
____________________________________________________________________
The most recent version of this document can be found at:
<http://www.us-cert.gov/cas/techalerts/TA07-093A.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <
subject.
____________________________________________________________________
For instructions on subscribing to or unsubscribing from this
mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
____________________________________________________________________
Produced 2007 by US-CERT, a government organization.
Terms of use:
<http://www.us-cert.gov/legal.html>
____________________________________________________________________
Revision History
April 3, 2007: Initial release
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