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Valid heap-buffer-overflow in slapi_dn_normalize_ext() -> sort_rdn_avs() ->
rdn_av_swap() (ldap/servers/slapd/dn.c). Triggered when a DN contains a legacy-quoted
value encoding a multivalued nested RDN. On closing quote, nested attribute-value
tracking is not finalized; a subsequent separator can leave stale pointers that
produce overlapping berval entries. In-place sorting then writes past the heap
allocation in rdn_av_swap().
Reachable pre-auth via any LDAP operation whose DN is normalized (search base DN
confirmed). Reproduced on RHEL 9.8 (389-ds-base-2.8.0-7.el9_8) with reporter PoC.
Production behavior (no ASAN/MALLOC_CHECK_): malformed DN often returns err=34
(Invalid DN syntax); server continues. With MALLOC_CHECK_=3: general protection
fault in libc, ns-slapd terminates.