Cyber Risks · PortSwigger Research

Decompressor

Summary: PortSwigger's BApp Store lists a third-party Burp Suite extension called Decompressor, version 1.2, last updated 19 June 2018, which opens compressed HTTP request and response bodies in a new tab so they can be viewed and modified. Using it requires disabling Burp's default unpacking of gzip and deflate in both requests and responses, and it requires Java version 8.

Key Takeaway: Burp decompresses message bodies by default but does not recompress them before forwarding, which breaks clients such as fat clients using RMI over HTTP that expect a fixed content-encoding - and this extension, a third-party tool PortSwigger makes no warranty about, has not been updated since 2018.

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Topics
Vulnerabilities & Patching
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