Microsoft IIS FTPd NLST Remote Buffer Overflow Vulnerability

Microsoft IIS is prone to a remote stack-based buffer-overflow vulnerability affecting the application's FTP server.

An attacker can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts will result in a denial-of-service condition.

This issue affects the following:

IIS 5.0
IIS 5.1
IIS 6.0 (denial of service only)
IIS 7.0 (denial of service only)

Note that Microsoft IIS 7.0 with FTP Service 7.5 is not affected.

Other versions may also be affected.

NOTE: This issue cannot be exploited to execute arbitrary code on IIS 6.0 or 7.0.

NOTE (September 1, 2009): This issue can be exploited to execute arbitrary code with SYSTEM-level privileges on IIS 5.0.

UPDATE (September 8, 2009); This issue may be related to a vulnerability reported in 1999 affecting IIS 3 and IIS 4. We will update this BID as more details emerge.


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