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43 lines
1.2 KiB
Markdown
43 lines
1.2 KiB
Markdown
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# Insecure Randomness
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## Summary
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* [GUID / UUID](#guid--uuid)
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* [GUID Versions](#guid-versions)
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* [Tools](#tools)
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* [References](#references)
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## GUID / UUID
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### GUID Versions
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Version identification: `xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx`
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The four-bit M and the 1- to 3-bit N fields code the format of the UUID itself.
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| Version | Notes |
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|----------|--------|
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| 0 | Only `00000000-0000-0000-0000-000000000000` |
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| 1 | based on time, or clock sequence |
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| 2 | reserved in the RFC 4122, but ommitted in many implementations |
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| 3 | based on a MD5 hash |
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| 4 | randomly generated |
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| 5 | based on a SHA1 hash |
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### Tools
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* [intruder-io/guidtool](https://github.com/intruder-io/guidtool) - A tool to inspect and attack version 1 GUIDs
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```ps1
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$ guidtool -i 95f6e264-bb00-11ec-8833-00155d01ef00
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UUID version: 1
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UUID time: 2022-04-13 08:06:13.202186
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UUID timestamp: 138691299732021860
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UUID node: 91754721024
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UUID MAC address: 00:15:5d:01:ef:00
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UUID clock sequence: 2099
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$ guidtool 1b2d78d0-47cf-11ec-8d62-0ff591f2a37c -t '2021-11-17 18:03:17' -p 10000
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```
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### References
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* [In GUID We Trust - Daniel Thatcher - October 11, 2022](https://www.intruder.io/research/in-guid-we-trust)
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