By Ebrima N. Ceesay, Jingmin Zhou, Michael Gertz, Karl Levitt, Matt Bishop (auth.), Roland Büschkes, Pavel Laskov (eds.)
This ebook constitutes the refereed lawsuits of the 3rd foreign convention on Detection of Intrusions and Malware, and Vulnerability evaluate, DIMVA 2006, held in Berlin, Germany in July 2006.
The eleven revised complete papers provided have been conscientiously reviewed and chosen from forty-one submissions. The papers are prepared in topical sections on code research, intrusion detection, probability defense and reaction, malware and forensics, and deployment scenarios.
Read or Download Detection of Intrusions and Malware & Vulnerability Assessment: Third International Conference, DIMVA 2006, Berlin, Germany, July 13-14, 2006. Proceedings PDF
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Additional info for Detection of Intrusions and Malware & Vulnerability Assessment: Third International Conference, DIMVA 2006, Berlin, Germany, July 13-14, 2006. Proceedings
We were able to identify all parameters that are used by the programs under examination. The parameter presence and absence model can use this information directly, instead of by learning, where we have no guarantee that all parameters will occur during the training phase. This knowledge alone can help to prevent attacks. 17), which suﬀered a mass defacement attack in December 2005. php ﬁle. Thus, the attacker’s request can be appropriately ﬂagged as anomalous. When considering each parameter that cannot be derived from the program code as potentially malicious, we would have generated nine false positives for the two applications evaluated above (seven for Horde, two for Squirrelmail).
The second analysis step uses the abstract syntax tree as a base for the extraction of parameter names as well as variable types and values. Then, connections between the parameters that are passed to a PHP program and the variables that are used within this program are established. Based on these connections and our knowledge of the types and value sets of variables, we can draw conclusions about the structure of the request parameters. To obtain a starting point for the analysis, we need to determine the locations within the code where a parameter can “enter” the program.
This creates potentially dangerous situations. Consider the following example. php, authorization is required. This authorization is obtained through some sort of mechanism that sets a global boolean variable $authorized. This variable is then queried every time before the sensitive information is displayed. authorized=true. The reason is that this request would create the global variable $authorized and set its value to true. php can be entered even if the authorization function fails because of missing credentials.