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40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
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# CPE guesser
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CPE guesser is a web service to guess the CPE name based on one or more keyword(s). Then the result can
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be used against [cve-search](https://github.com/cve-search/cve-search) to do actual searches by CPE names.
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## Requirements
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- Redis
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- Python
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## How does this work?
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A CPE entry is composed of a human readable name with some references and the structured CPE name.
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~~~
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<cpe-item name="cpe:/a:10web:form_maker:1.7.17::~~~wordpress~~">
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<title xml:lang="en-US">10web Form Maker 1.7.17 for WordPress</title>
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<references>
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<reference href="https://wordpress.org/plugins/form-maker/#developers">Change Log</reference>
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</references>
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<cpe-23:cpe23-item name="cpe:2.3:a:10web:form_maker:1.7.17:*:*:*:*:wordpress:*:*"/>
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</cpe-item>
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~~~
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The CPE name is structured with a vendor name, a product name and some additional information.
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CPE name can be easily changed due to vendor name or product name changes, some vendor/product are
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sharing common names or name is composed of multiple words.
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### Data
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Split vendor name and product name (such as `_`) into single word(s) and then canonize the word. Building an inverse index using
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the cpe vendor:product format as value and the canonized word as key. Then cpe guesser creates a ranked set with the most common
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cpe (vendor:product) per version to give a probability of the CPE appearance.
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### Redis structure
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- `w:<word>` set
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- `s:<word>` sorted set with a score depending of the number of appearance
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