Emmanuel Lécharny created DIRAPI-439:
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Summary: Hostile server subschema bytecode is class-loaded and
instantiated on the client
Key: DIRAPI-439
URL: https://issues.apache.org/jira/browse/DIRAPI-439
Project: Directory Client API
Issue Type: Bug
Affects Versions: 2.1.8
Reporter: Emmanuel Lécharny
Fix For: 2.1.9
A rogue/compromised *LDAP* server (or pre-*TLS* *MITM*) answers a client's
_loadSchema()_ subschema search with '_syntaxCheckers_:
{code:java}
( 1.2.3.4 FQCN evil.Pwn BYTECODE <base64 of a class whose static{} runs
Runtime.exec> X-SCHEMA "other" )
{code}
_DefaultSchemaLoader_ parses it, _SchemaEntityFactory_ defines the class via
_AttributeClassLoader_ and instantiates it — attacker code executes in the
client *JVM* with the application's privileges.
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