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https://issues.apache.org/jira/browse/DIRAPI-450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Lécharny closed DIRAPI-450.
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> Grammar transitions ignore TLV nesting, enabling filter-structure smuggling
> ---------------------------------------------------------------------------
>
> Key: DIRAPI-450
> URL: https://issues.apache.org/jira/browse/DIRAPI-450
> Project: Directory Client API
> Issue Type: Bug
> Affects Versions: 2.1.8
> Reporter: Emmanuel Lécharny
> Priority: Major
> Fix For: 2.1.9
>
>
> An environment fronts *ApacheDS* with an *LDAP*-inspecting gateway that
> blocks filters touching _(userPassword=*)_.
> The attacker tucks an extra _(userPassword=*)_ _equalityMatch_ *TLV* inside a
> substring element's *TLV* — the gateway's conformant parser errors out or
> sees only the benign clauses, while this codec evaluates the smuggled clause
> as a sibling filter.
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