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import bind-9.16.23-4.el9

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CentOS Sources 2022-09-27 07:14:30 -04:00 committed by root
parent 13a9717633
commit 8dc5c2990f
4 changed files with 1495 additions and 1 deletions
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1144
SOURCES/bind-9.16-CVE-2021-25220-test.patch Normal file
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@ -0,0 +1,251 @@
From 5b2798e01346cd77741873091babf6c4a3128449 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Wed, 19 Jan 2022 17:38:18 +1100
Subject: [PATCH] Add additional name checks when using a forwarder
When using a forwarder, check that the owner name of response
records are within the bailiwick of the forwarded name space.
(cherry picked from commit 24155213be59faad17f0215ecf73ea49ab781e5b)
Check that the forward declaration is unchanged and not overridden
If we are using a fowarder, in addition to checking that names to
be cached are subdomains of the forwarded namespace, we must also
check that there are no subsidiary forwarded namespaces which would
take precedence. To be safe, we don't cache any responses if the
forwarding configuration has changed since the query was sent.
(cherry picked from commit 3fc7accd88cd0890f8f57bb13765876774298ba3)
Check cached names for possible "forward only" clause
When caching additional and glue data *not* from a forwarder, we must
check that there is no "forward only" clause covering the owner name
that would take precedence. Such names would normally be allowed by
baliwick rules, but a "forward only" zone introduces a new baliwick
scope.
(cherry picked from commit ea06552a3d1fed56f7d3a13710e084ec79797b78)
Look for zones deeper than the current domain or forward name
When caching glue, we need to ensure that there is no closer
source of truth for the name. If the owner name for the glue
record would be answered by a locally configured zone, do not
cache.
(cherry picked from commit 71b24210542730355149130770deea3e58d8527a)
---
lib/dns/resolver.c | 128 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 123 insertions(+), 5 deletions(-)
diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index a7bc661bb7..7603a07b7b 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -63,6 +63,8 @@
#include <dns/stats.h>
#include <dns/tsig.h>
#include <dns/validator.h>
+#include <dns/zone.h>
+
#ifdef WANT_QUERYTRACE
#define RTRACE(m) \
isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER, \
@@ -337,6 +339,8 @@ struct fetchctx {
dns_fetch_t *qminfetch;
dns_rdataset_t qminrrset;
dns_name_t qmindcname;
+ dns_fixedname_t fwdfname;
+ dns_name_t *fwdname;
/*%
* The number of events we're waiting for.
@@ -3764,6 +3768,7 @@ fctx_getaddresses(fetchctx_t *fctx, bool badcache) {
if (result == ISC_R_SUCCESS) {
fwd = ISC_LIST_HEAD(forwarders->fwdrs);
fctx->fwdpolicy = forwarders->fwdpolicy;
+ dns_name_copynf(domain, fctx->fwdname);
if (fctx->fwdpolicy == dns_fwdpolicy_only &&
isstrictsubdomain(domain, &fctx->domain))
{
@@ -5153,6 +5158,9 @@ fctx_create(dns_resolver_t *res, const dns_name_t *name, dns_rdatatype_t type,
fctx->restarts = 0;
fctx->querysent = 0;
fctx->referrals = 0;
+
+ fctx->fwdname = dns_fixedname_initname(&fctx->fwdfname);
+
TIME_NOW(&fctx->start);
fctx->timeouts = 0;
fctx->lamecount = 0;
@@ -5215,6 +5223,7 @@ fctx_create(dns_resolver_t *res, const dns_name_t *name, dns_rdatatype_t type,
fname, &forwarders);
if (result == ISC_R_SUCCESS) {
fctx->fwdpolicy = forwarders->fwdpolicy;
+ dns_name_copynf(fname, fctx->fwdname);
}
if (fctx->fwdpolicy != dns_fwdpolicy_only) {
@@ -7118,6 +7127,107 @@ mark_related(dns_name_t *name, dns_rdataset_t *rdataset, bool external,
}
}
+/*
+ * Returns true if 'name' is external to the namespace for which
+ * the server being queried can answer, either because it's not a
+ * subdomain or because it's below a forward declaration or a
+ * locally served zone.
+ */
+static inline bool
+name_external(const dns_name_t *name, dns_rdatatype_t type, fetchctx_t *fctx) {
+ isc_result_t result;
+ dns_forwarders_t *forwarders = NULL;
+ dns_fixedname_t fixed, zfixed;
+ dns_name_t *fname = dns_fixedname_initname(&fixed);
+ dns_name_t *zfname = dns_fixedname_initname(&zfixed);
+ dns_name_t *apex = NULL;
+ dns_name_t suffix;
+ dns_zone_t *zone = NULL;
+ unsigned int labels;
+ dns_namereln_t rel;
+
+ apex = ISFORWARDER(fctx->addrinfo) ? fctx->fwdname : &fctx->domain;
+
+ /*
+ * The name is outside the queried namespace.
+ */
+ rel = dns_name_fullcompare(name, apex, &(int){ 0 },
+ &(unsigned int){ 0U });
+ if (rel != dns_namereln_subdomain && rel != dns_namereln_equal) {
+ return (true);
+ }
+
+ /*
+ * If the record lives in the parent zone, adjust the name so we
+ * look for the correct zone or forward clause.
+ */
+ labels = dns_name_countlabels(name);
+ if (dns_rdatatype_atparent(type) && labels > 1U) {
+ dns_name_init(&suffix, NULL);
+ dns_name_getlabelsequence(name, 1, labels - 1, &suffix);
+ name = &suffix;
+ } else if (rel == dns_namereln_equal) {
+ /* If 'name' is 'apex', no further checking is needed. */
+ return (false);
+ }
+
+ /*
+ * If there is a locally served zone between 'apex' and 'name'
+ * then don't cache.
+ */
+ LOCK(&fctx->res->view->lock);
+ if (fctx->res->view->zonetable != NULL) {
+ unsigned int options = DNS_ZTFIND_NOEXACT | DNS_ZTFIND_MIRROR;
+ result = dns_zt_find(fctx->res->view->zonetable, name, options,
+ zfname, &zone);
+ if (zone != NULL) {
+ dns_zone_detach(&zone);
+ }
+ if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
+ if (dns_name_fullcompare(zfname, apex, &(int){ 0 },
+ &(unsigned int){ 0U }) ==
+ dns_namereln_subdomain)
+ {
+ UNLOCK(&fctx->res->view->lock);
+ return (true);
+ }
+ }
+ }
+ UNLOCK(&fctx->res->view->lock);
+
+ /*
+ * Look for a forward declaration below 'name'.
+ */
+ result = dns_fwdtable_find(fctx->res->view->fwdtable, name, fname,
+ &forwarders);
+
+ if (ISFORWARDER(fctx->addrinfo)) {
+ /*
+ * See if the forwarder declaration is better.
+ */
+ if (result == ISC_R_SUCCESS) {
+ return (!dns_name_equal(fname, fctx->fwdname));
+ }
+
+ /*
+ * If the lookup failed, the configuration must have
+ * changed: play it safe and don't cache.
+ */
+ return (true);
+ } else if (result == ISC_R_SUCCESS &&
+ forwarders->fwdpolicy == dns_fwdpolicy_only &&
+ !ISC_LIST_EMPTY(forwarders->fwdrs))
+ {
+ /*
+ * If 'name' is covered by a 'forward only' clause then we
+ * can't cache this repsonse.
+ */
+ return (true);
+ }
+
+ return (false);
+}
+
static isc_result_t
check_section(void *arg, const dns_name_t *addname, dns_rdatatype_t type,
dns_section_t section) {
@@ -7144,7 +7254,7 @@ check_section(void *arg, const dns_name_t *addname, dns_rdatatype_t type,
result = dns_message_findname(rctx->query->rmessage, section, addname,
dns_rdatatype_any, 0, &name, NULL);
if (result == ISC_R_SUCCESS) {
- external = !dns_name_issubdomain(name, &fctx->domain);
+ external = name_external(name, type, fctx);
if (type == dns_rdatatype_a) {
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
@@ -8768,6 +8878,13 @@ rctx_answer_scan(respctx_t *rctx) {
break;
case dns_namereln_subdomain:
+ /*
+ * Don't accept DNAME from parent namespace.
+ */
+ if (name_external(name, dns_rdatatype_dname, fctx)) {
+ continue;
+ }
+
/*
* In-scope DNAME records must have at least
* as many labels as the domain being queried.
@@ -9081,13 +9198,11 @@ rctx_authority_positive(respctx_t *rctx) {
DNS_SECTION_AUTHORITY);
while (!done && result == ISC_R_SUCCESS) {
dns_name_t *name = NULL;
- bool external;
dns_message_currentname(rctx->query->rmessage,
DNS_SECTION_AUTHORITY, &name);
- external = !dns_name_issubdomain(name, &fctx->domain);
- if (!external) {
+ if (!name_external(name, dns_rdatatype_ns, fctx)) {
dns_rdataset_t *rdataset = NULL;
/*
@@ -9474,7 +9589,10 @@ rctx_authority_dnssec(respctx_t *rctx) {
}
if (!dns_name_issubdomain(name, &fctx->domain)) {
- /* Invalid name found; preserve it for logging later */
+ /*
+ * Invalid name found; preserve it for logging
+ * later.
+ */
rctx->found_name = name;
rctx->found_type = ISC_LIST_HEAD(name->list)->type;
continue;
--
2.34.1

81
SOURCES/bind-9.16-CVE-2022-0396.patch Normal file
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@ -0,0 +1,81 @@
From 33064cd077cf6fa386f0a5a840c2161868da7b3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
Date: Tue, 8 Feb 2022 12:42:34 +0100
Subject: [PATCH] Run .closehandle_cb asynchrounosly in nmhandle_detach_cb()
When sock->closehandle_cb is set, we need to run nmhandle_detach_cb()
asynchronously to ensure correct order of multiple packets processing in
the isc__nm_process_sock_buffer(). When not run asynchronously, it
would cause:
a) out-of-order processing of the return codes from processbuffer();
b) stack growth because the next TCP DNS message read callback will
be called from within the current TCP DNS message read callback.
The sock->closehandle_cb is set to isc__nm_resume_processing() for TCP
sockets which calls isc__nm_process_sock_buffer(). If the read callback
(called from isc__nm_process_sock_buffer()->processbuffer()) doesn't
attach to the nmhandle (f.e. because it wants to drop the processing or
we send the response directly via uv_try_write()), the
isc__nm_resume_processing() (via .closehandle_cb) would call
isc__nm_process_sock_buffer() recursively.
The below shortened code path shows how the stack can grow:
1: ns__client_request(handle, ...);
2: isc_nm_tcpdns_sequential(handle);
3: ns_query_start(client, handle);
4: query_lookup(qctx);
5: query_send(qctcx->client);
6: isc__nmhandle_detach(&client->reqhandle);
7: nmhandle_detach_cb(&handle);
8: sock->closehandle_cb(sock); // isc__nm_resume_processing
9: isc__nm_process_sock_buffer(sock);
10: processbuffer(sock); // isc__nm_tcpdns_processbuffer
11: isc_nmhandle_attach(req->handle, &handle);
12: isc__nm_readcb(sock, req, ISC_R_SUCCESS);
13: isc__nm_async_readcb(NULL, ...);
14: uvreq->cb.recv(...); // ns__client_request
Instead, if 'sock->closehandle_cb' is set, we need to run detach the
handle asynchroniously in 'isc__nmhandle_detach', so that on line 8 in
the code flow above does not start this recursion. This ensures the
correct order when processing multiple packets in the function
'isc__nm_process_sock_buffer()' and prevents the stack growth.
When not run asynchronously, the out-of-order processing leaves the
first TCP socket open until all requests on the stream have been
processed.
If the pipelining is disabled on the TCP via `keep-response-order`
configuration option, named would keep the first socket in lingering
CLOSE_WAIT state when the client sends an incomplete packet and then
closes the connection from the client side.
(cherry picked from commit afee2b5a7bc933a2d987907fc327a9f118fdbd17)
---
lib/isc/netmgr/netmgr.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 3283eb6e4f..0ed3182fb6 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -1746,8 +1746,12 @@ isc__nmhandle_detach(isc_nmhandle_t **handlep FLARG) {
handle = *handlep;
*handlep = NULL;
+ /*
+ * If the closehandle_cb is set, it needs to run asynchronously to
+ * ensure correct ordering of the isc__nm_process_sock_buffer().
+ */
sock = handle->sock;
- if (sock->tid == isc_nm_tid()) {
+ if (sock->tid == isc_nm_tid() && sock->closehandle_cb == NULL) {
nmhandle_detach_cb(&handle FLARG_PASS);
} else {
isc__netievent_detach_t *event =
--
2.34.1

20
SPECS/bind.spec
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@ -51,7 +51,7 @@ Summary: The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
Name: bind
License: MPLv2.0
Version: 9.16.23
Release: 1%{?dist}
Release: 4%{?dist}
Epoch: 32
Url: https://www.isc.org/downloads/bind/
#
@ -101,6 +101,10 @@ Patch157:bind-9.11-fips-tests.patch
Patch164:bind-9.11-rh1666814.patch
Patch170:bind-9.11-feature-test-named.patch
Patch171:bind-9.11-tests-variants.patch
# https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/5987
Patch172:bind-9.16-CVE-2022-0396.patch
Patch173:bind-9.16-CVE-2021-25220.patch
Patch174:bind-9.16-CVE-2021-25220-test.patch
%{?systemd_ordering}
Requires: coreutils
@ -401,6 +405,9 @@ in HTML and PDF format.
%patch164 -p1 -b .rh1666814
%patch170 -p1 -b .featuretest-named
%patch171 -p1 -b .test-variant
%patch172 -p1 -b .CVE-2022-0396
%patch173 -p1 -b .CVE-2021-25220
%patch174 -p1 -b .CVE-2021-25220-test
%if %{with PKCS11}
%patch135 -p1 -b .config-pkcs11
@ -1123,6 +1130,17 @@ fi;
%endif
%changelog
* Thu Jul 14 2022 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-4
- Export bind-doc package (#2104863)
* Mon Apr 11 2022 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-3
- Tighten cache protection against record from forwarders (CVE-2021-25220)
- Include test of forwarders
* Fri Mar 25 2022 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-2
- TCP connections with 'keep-response-order' are properly close in all cases
(CVE-2022-0396)
* Fri Nov 19 2021 Petr Menšík <pemensik@redhat.com> - 32:9.16.23-1
- Update to 9.16.23 (#2024210)