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https://issues.apache.org/jira/browse/DIRAPI-458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Lécharny closed DIRAPI-458.
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> FilterEncoder passes attacker hex escapes through unencoded
> -----------------------------------------------------------
>
> Key: DIRAPI-458
> URL: https://issues.apache.org/jira/browse/DIRAPI-458
> Project: Directory Client API
> Issue Type: Bug
> Affects Versions: 2.1.8
> Reporter: Emmanuel Lécharny
> Priority: Major
> Fix For: 2.1.9
>
>
> A web app blocks the username '_admin_' at input validation, then builds
> "_(uid={0})_" via _FilterEncoder.format_.
> The attacker submits '_\61dmin_' — the blocklist sees no forbidden substring,
> the encoder emits _(uid=\61dmin)_, the directory decodes the assertion to
> '_admin_', and the lookup proceeds against the fenced-off entry.
> The same trick defeats per-username lockout/rate-limit counters keyed on the
> literal input.
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