For example, this could be triggered simply by adding a URL as the key of a Java Map. However, we've increasingly encountered cases where systems perform a DNS lookup with no intention of ever connecting to the remote host, meaning that no HTTP request ever existed. Although we can't detect this externally, it could still provide a vector for pivoting attacks against the internal network. We previously classed this as a high-severity issue on the assumption that a corresponding HTTP request was probably sent by the server, but subsequently blocked by a firewall's egress filters. To better reflect this latter scenario, we have adjusted the severity of the External service interaction (DNS) issue. In some cases, such as when testing for SSRF, we may induce the application to perform a DNS lookup without this leading to the discovery of any further vulnerability. Both the DNS interaction itself and the identified vulnerability are reported as separate issues.
Adjusted issue severity - External service interaction (DNS)īurp Scanner uses OAST techniques to identify critical vulnerabilities via DNS pingbacks to Burp Collaborator. Sending requests over separate connections is primarily useful when testing for vulnerabilities that require a multi-step process. Sending over a single connection is also useful for timing-based attacks that rely on being able to compare responses with very small differences in timings as it reduces the "jitter" that can occur when establishing TCP connections.
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For more information about how to do this, as well as some deliberately vulnerable labs for you to practice on, check out the new content on the Web Security Academy. Sending requests over a single connection enables you to test for client-side desync vulnerabilities. You can either send all of the requests over a single connection or use a separate connection for each request. When viewing a tab that belongs to a group, there is now a drop-down menu next to the Send button that lets you choose how your request sequence is sent. You can now send the requests from a group of Repeater tabs as an automated sequence. Send a sequence of requests in Burp Repeater We've also upgraded our existing HTTP request smuggling checks to detect CL.0 vulnerabilities.įor more details on both of these issues, check out James's whitepaper and the new Web Security Academy content. New scan checks for client-side desync and CL.0 request smugglingīurp Scanner now reports client-side desync vulnerabilities. It also introduces the new capabilities for Burp Repeater that enable you test for these vulnerabilities manually. This release provides new scan checks based on James Kettle's Browser-Powered Desync Attacks, first presented at Black Hat USA 2022.
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