Author: dougb
Date: Tue Jul 24 18:53:28 2012
New Revision: 238746
URL: http://svn.freebsd.org/changeset/base/238746
Log:
Heavy DNSSEC Validation Load Can Cause a "Bad Cache" Assertion Failure
in BIND9
High numbers of queries with DNSSEC validation enabled can cause an
assertion failure in named, caused by using a "bad cache" data structure
before it has been initialized.
CVE: CVE-2012-3817
Posting date: 24 July, 2012
Modified:
head/contrib/bind9/CHANGES
head/contrib/bind9/lib/dns/resolver.c
head/contrib/bind9/lib/dns/zone.c
head/contrib/bind9/version
Directory Properties:
head/contrib/bind9/ (props changed)
Modified: head/contrib/bind9/CHANGES
==============================================================================
--- head/contrib/bind9/CHANGES Tue Jul 24 18:49:18 2012 (r238745)
+++ head/contrib/bind9/CHANGES Tue Jul 24 18:53:28 2012 (r238746)
@@ -1,3 +1,12 @@
+ --- 9.8.3-P2 released ---
+
+3346. [security] Bad-cache data could be used before it was
+ initialized, causing an assert. [RT #30025]
+
+3342. [bug] Change #3314 broke saving of stub zones to disk
+ resulting in excessive cpu usage in some cases.
+ [RT #29952]
+
--- 9.8.3-P1 released ---
3331. [security] dns_rdataslab_fromrdataset could produce bad
Modified: head/contrib/bind9/lib/dns/resolver.c
==============================================================================
--- head/contrib/bind9/lib/dns/resolver.c Tue Jul 24 18:49:18 2012
(r238745)
+++ head/contrib/bind9/lib/dns/resolver.c Tue Jul 24 18:53:28 2012
(r238746)
@@ -8448,6 +8448,7 @@ dns_resolver_addbadcache(dns_resolver_t
goto cleanup;
bad->type = type;
bad->hashval = hashval;
+ bad->expire = *expire;
isc_buffer_init(&buffer, bad + 1, name->length);
dns_name_init(&bad->name, NULL);
dns_name_copy(name, &bad->name, &buffer);
@@ -8459,8 +8460,8 @@ dns_resolver_addbadcache(dns_resolver_t
if (resolver->badcount < resolver->badhash * 2 &&
resolver->badhash > DNS_BADCACHE_SIZE)
resizehash(resolver, &now, ISC_FALSE);
- }
- bad->expire = *expire;
+ } else
+ bad->expire = *expire;
cleanup:
UNLOCK(&resolver->lock);
}
Modified: head/contrib/bind9/lib/dns/zone.c
==============================================================================
--- head/contrib/bind9/lib/dns/zone.c Tue Jul 24 18:49:18 2012
(r238745)
+++ head/contrib/bind9/lib/dns/zone.c Tue Jul 24 18:53:28 2012
(r238746)
@@ -8027,13 +8027,14 @@ zone_maintenance(dns_zone_t *zone) {
case dns_zone_master:
case dns_zone_slave:
case dns_zone_key:
+ case dns_zone_stub:
LOCK_ZONE(zone);
if (zone->masterfile != NULL &&
isc_time_compare(&now, &zone->dumptime) >= 0 &&
DNS_ZONE_FLAG(zone, DNS_ZONEFLG_LOADED) &&
DNS_ZONE_FLAG(zone, DNS_ZONEFLG_NEEDDUMP)) {
dumping = was_dumping(zone);
- } else
+ } else
dumping = ISC_TRUE;
UNLOCK_ZONE(zone);
if (!dumping) {
@@ -8386,7 +8387,7 @@ zone_dump(dns_zone_t *zone, isc_boolean_
goto fail;
}
- if (compact) {
+ if (compact && zone->type != dns_zone_stub) {
dns_zone_t *dummy = NULL;
LOCK_ZONE(zone);
zone_iattach(zone, &dummy);
@@ -9242,7 +9243,7 @@ stub_callback(isc_task_t *task, isc_even
dns_zone_t *zone = NULL;
char master[ISC_SOCKADDR_FORMATSIZE];
char source[ISC_SOCKADDR_FORMATSIZE];
- isc_uint32_t nscnt, cnamecnt;
+ isc_uint32_t nscnt, cnamecnt, refresh, retry, expire;
isc_result_t result;
isc_time_t now;
isc_boolean_t exiting = ISC_FALSE;
@@ -9390,19 +9391,32 @@ stub_callback(isc_task_t *task, isc_even
ZONEDB_LOCK(&zone->dblock, isc_rwlocktype_write);
if (zone->db == NULL)
zone_attachdb(zone, stub->db);
+ result = zone_get_from_db(zone, zone->db, NULL, NULL, NULL, &refresh,
+ &retry, &expire, NULL, NULL);
+ if (result == ISC_R_SUCCESS) {
+ zone->refresh = RANGE(refresh, zone->minrefresh,
+ zone->maxrefresh);
+ zone->retry = RANGE(retry, zone->minretry, zone->maxretry);
+ zone->expire = RANGE(expire, zone->refresh + zone->retry,
+ DNS_MAX_EXPIRE);
+ DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_HAVETIMERS);
+ }
ZONEDB_UNLOCK(&zone->dblock, isc_rwlocktype_write);
dns_db_detach(&stub->db);
- if (zone->masterfile != NULL)
- zone_needdump(zone, 0);
-
dns_message_destroy(&msg);
isc_event_free(&event);
dns_request_destroy(&zone->request);
+
DNS_ZONE_CLRFLAG(zone, DNS_ZONEFLG_REFRESH);
+ DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_LOADED);
DNS_ZONE_JITTER_ADD(&now, zone->refresh, &zone->refreshtime);
isc_interval_set(&i, zone->expire, 0);
DNS_ZONE_TIME_ADD(&now, zone->expire, &zone->expiretime);
+
+ if (zone->masterfile != NULL)
+ zone_needdump(zone, 0);
+
zone_settimer(zone, &now);
goto free_stub;
Modified: head/contrib/bind9/version
==============================================================================
--- head/contrib/bind9/version Tue Jul 24 18:49:18 2012 (r238745)
+++ head/contrib/bind9/version Tue Jul 24 18:53:28 2012 (r238746)
@@ -7,4 +7,4 @@ MAJORVER=9
MINORVER=8
PATCHVER=3
RELEASETYPE=-P
-RELEASEVER=1
+RELEASEVER=2
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