Microsoft Step-By-Step Interactive Training Bookmark Link Buffer Overflow Vulnerability



Date Discovered

June 14, 2005


Microsoft Step-By-Step Interactive Training is prone to a buffer overflow vulnerability. This is due to a boundary condition error related to validation of data in bookmark link files. As bookmark link files may originate from an external source, this issue may be remotely exploitable. Successful exploitation will result in execution of arbitrary code in the context of the currently logged in user. A number of third-party providers may supply the Step-by-Step Interactive training program as a part of their products. There is not a conclusive list of products that may have installed this software.

Technologies Affected

  • Microsoft Step-By-Step Interactive


Do not accept or execute files from untrusted or unknown sources.
Users should avoid accepting or opening unexpected files, especially if they arrive in email from an untrusted or unfamiliar source.

Do not follow links provided by unknown or untrusted sources.
Users should be wary of visiting Web sites of questionable integrity, especially if solicited to do so by an unfamiliar or untrusted source through email or other means.

Implement multiple redundant layers of security.
Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.

Run all software as a nonprivileged user with minimal access rights.
All non-administrative activities should be performed as an unprivileged user with minimal access rights. This will limit the impact of vulnerabilities that may be exploited through Web or email attack vectors.

Disable any services that are not needed.
Disable or remove Step-By-Step Interactive Training if it is not explicitly required.

Filter potentially malicious network data.
Bookmark link email attachments may be filtered at the email gateway. This may limit exposure to email-based attack vectors.

Microsoft has released fixes to address this vulnerability.



Discovery is credited to iDEFENSE Labs.

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