Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: April 2008 - Black Tuesday Overview SANS ISC InfoSec Forums

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April 2008 - Black Tuesday Overview

Overview of the April 2008 Microsoft patches and their status.

# Affected Contra Indications Known Exploits Microsoft rating ISC rating(*)
clients servers
MS08-018 Input validation vulnerability allows code execution when opening a malicious file.

KB 950183 No publicly known exploits Critical Critical Important
MS08-019 Multiple input validation vulnerabilities allow code execution.
Replaces MS07-030.

KB 949032
No publicly known exploits Important Critical Important
MS08-020 Windows' DNS client vulnerable to spoofing due to lack of entropy in a random number generator.
DNS client

KB 945553 No publicly known exploits Important Critical Critical

Heap overflows in opening EMF and WMF images and file name based stack overflow in opening EMF files allow code execution.
Replaces MS07-046.


KB 948590
No publicly known exploits Critical Critical Important
MS08-022 Javascript and visual basic script engines allow code execution.
Replaces MS06-023.

Scripting engines


KB 944338 No publicly known exploits Critical Critical Important
MS08-023 3rd party killbit for a Yahoo! Music Jukebox activeX control that could allow code execution.

KB 948881
PoC exploits were posted on the internet Critical Critical Important
MS08-024 Cumulative Internet Explorer patch. Adds protection for an unspecified vulnerability leading to code execution when visiting a compromised or malicious web site.
Replaces MS08-010.

KB 947864 No publicly known exploits Critical Critical Important
MS08-025 Input validation vulnerability in the windows kernel allows privilege escalation.
Windows kernel

KB 941693
No publicly known exploits Important Critical Critical


We will update issues on this page as they evolve.
We appreciate updates
US based customers can call Microsoft for free patch related support on 1-866-PCSAFETY
(*): ISC rating
  • We use 4 levels:
    • PATCH NOW: Typically used where we see immediate danger of exploitation. Typical environments will want to deploy these patches ASAP. Workarounds are typically not accepted by users or are not possible. This rating is often used when typical deployments make it vulnerable and exploits are being used or easy to obtain or make.
    • Critical: Anything that needs little to become "interesting" for the dark side. Best approach is to test and deploy ASAP. Workarounds can give more time to test.
    • Important: Things where more testing and other measures can help.
    • Less Urgent: Typically we expect the impact if left unpatched to be not that big a deal in the short term. Do not forget them however.
  • The difference between the client and server rating is based on how you use the affected machine. We take into account the typical client and server deployment in the usage of the machine and the common measures people typically have in place already. Measures we presume are simple best practices for servers such as not using outlook, MSIE, word etc. to do traditional office or leisure work.
  • The rating is not a risk analysis as such. It is a rating of importance of the vulnerability and the perceived or even predicted threat for affected systems. The rating does not account for the number of affected systems there are. It is for an affected system in a typical worst-case role.
  • Only the organization itself is in a position to do a full risk analysis involving the presence (or lack of) affected systems, the actually implemented measures, the impact on their operation and the value of the assets involved.
  • All patches released by a vendor are important enough to have a close look if you use the affected systems. There is little incentive for vendors to publicize patches that do not have some form of risk to them.

Swa Frantzen -- Gorilla Security


760 Posts
Apr 8th 2008

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