Emmanuel Lécharny created DIRAPI-471:
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Summary: TLV.getSize() integer overflow bypasses parent
length-containment check
Key: DIRAPI-471
URL: https://issues.apache.org/jira/browse/DIRAPI-471
Project: Directory Client API
Issue Type: Bug
Affects Versions: 2.1.8
Reporter: Emmanuel Lécharny
Fix For: 2.1.9
With default unbounded _maxPDUSize_, a hostile peer sends a root *SEQUENCE*
declaring length 16, then a child *TLV* declaring _0x7FFFFFFF_: _getSize()_
wraps to *-2147483643*, the containment check is bypassed, and the parent's
_expectedLength_ is rewritten to an overflowed value — the decoder proceeds
with a structurally impossible *TLV* tree instead of rejecting the *PDU*.
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