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August 2018 Archives
Ryan Barnett, Principal Security Researcher, Akamai Elad Shuster, Senior Security Researcher, Akamai In this blog post, we will discuss different Denial of Service (DoS) attacks that may negatively impact your API services, as well as mitigations offered by Kona Site Defender (KSD).
This blog post is a follow-up to https://blogs.akamai.com/2018/08/apache-struts-vulnerability-cve-2018-11776.html and its purpose is to highlight attack data we have seen on the Akamai network related to this vulnerability.
Our exploration of methods for normalizing the number of web application attacks sourced by each country has only considered contextual variables from external sources that characterized each country in a context devoid from Akamai, so far. This final leg of the journey will situate the attack counts within a context that is specific to Akamai and the characteristics of the attacks themselves.
On the week of July 15th, researcher Juha-Matti Tilli disclosed a vulnerability in the Linux kernel to the kernel maintainers, the National Cyber Security Center - Finland (NCSC-FI), CERT Coordination Center (CERT/CC), and Akamai. The vulnerability, CVE-2018-5391, is a resource exhaustion attack triggered by a specially crafted stream of IP datagrams that cause expensive processing within the Linux kernel. This vulnerability is similar to the Linux TCP vulnerability announced August,
In the last installment, we introduced the challenge of normalizing a geographic visualization showing the observed number of web application attacks sourced from each country. This time, we'll try to discern which potential normalizing variables could have a significant relationship with the attack counts through exploratory analysis and hopefully gain some new insights.
On the week of July 15th researcher Juha-Matti Tilli disclosed a vulnerability he discovered in the Linux kernel to the kernel maintainers, the National Cyber Security Center - Finland (NCSC-FI), CERT Coordination Center (CERT/CC), and Akamai. The vulnerability, CVE-2018-5390, is a resource exhaustion attack triggered by a specially crafted stream of TCP segments which creates expensive processing within the Linux kernel. In preparation for the public disclosure of the vulnerability,
I recently attended Thotcon in Chicago, where I saw a presentation by Avishay Zawoznik called, "V!4GR4 BotNet: Cyber-Crime, Enlarged". It describes the processes, by a black hat, that used SQL injection to inject Viagra spam into vulnerable websites. The main takeaway was that the speaker talked about how compromised wordpress websites were used as webshells to operate the spam campaign from. I originally was under the assumption that websites were