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Vulnerability Note VU#644886Ethereal fails to properly parse NetFlow UDP packets with an overly large template_entry countOverviewEthereal fails to properly parse v9_template structures in NetFlow UDP packets with an overly large template_entry count. This could allow an attacker to execute arbitrary code.I. DescriptionEthereal is a network traffic analysis package. It includes the ability to decode packets containing NetFlow data. There is a buffer overflow vulnerability in the way the NetFlow v9 dissector parses v9_template structures in a NetFlow UDP packet. A remote, unauthenticated attacker could exploit this vulnerability by sending a NetFlow UDP packet containing an overly large template_entry count which could allow for arbitrary code execution.II. ImpactA remote, unauthenticated attacker could execute arbitrary code on the vulnerable system.III. SolutionUpgradeUpgrade to version 0.10.3 or later.
2) Deselect the NetFlow protocol dissector from the list (for Ethereal versions 0.10.x)
2) Disable the CFLOW (Cisco NetFlow) protocol dissector from the list by unchecking its "Status" checkbox However, it is strongly encouraged to upgrade to version 0.10.3 or later. Systems Affected
References
Ethereal credits Stefan Esser for reporting this vulnerability. This document was written by Damon Morda.
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