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Exchange/IIS SMTP Malformed BDAT Command Denial of Service

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Exchange/IIS SMTP Malformed BDAT Command Denial of Service

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
03/08/2002
Created
07/25/2018
Added
11/01/2004
Modified
12/04/2013

Description

Microsoft Exchange and the built-in Microsoft SMTP server are vulnerable to a denial of service attack resulting from a certain sequence of malformed SMTP commands.

When the SMTP server encounters the following sequence of commands (after sending MAIL FROM and RCPT TO), it will crash, causing the session to hang or drop:

         BDAT 4<crlf>
         b00mAUTH LOGIN<crlf>
      

Solution(s)

  • install-microsoft-patch-8e6a6a44a82c61a6a9b06ce93ae73874
  • install-microsoft-patch-db0d343df20346c1d097cbb05791413e

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