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bind.16199
bind-CVE-2021-25214.patch
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File bind-CVE-2021-25214.patch of Package bind.16199
diff --git a/lib/dns/xfrin.c b/lib/dns/xfrin.c index d218f747d6..b78053f766 100644 --- a/lib/dns/xfrin.c +++ b/lib/dns/xfrin.c @@ -498,6 +498,20 @@ xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, uint32_t ttl, FAIL(DNS_R_FORMERR); } + /* + * Immediately reject the entire transfer if the RR that is currently + * being processed is an SOA record that is not placed at the zone + * apex. + */ + if (rdata->type == dns_rdatatype_soa && + !dns_name_equal(&xfr->name, name)) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(name, namebuf, sizeof(namebuf)); + xfrin_log(xfr, ISC_LOG_DEBUG(3), "SOA name mismatch: '%s'", + namebuf); + FAIL(DNS_R_NOTZONETOP); + } + redo: switch (xfr->state) { case XFRST_SOAQUERY:
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