From efa9065965e86511eb2b7067aee09142c48112fb Mon Sep 17 00:00:00 2001 From: jiangheng Date: Mon, 11 Apr 2022 16:54:59 +0800 Subject: [PATCH] fix CVE-2021-25220 --- backport-CVE-2021-25220.patch | 208 ++++++++++++++++++ ...0396.patch => backport-CVE-2022-0396.patch | 0 bind.spec | 12 +- 3 files changed, 218 insertions(+), 2 deletions(-) create mode 100644 backport-CVE-2021-25220.patch rename CVE-2022-0396.patch => backport-CVE-2022-0396.patch (100%) diff --git a/backport-CVE-2021-25220.patch b/backport-CVE-2021-25220.patch new file mode 100644 index 0000000..bb4dd26 --- /dev/null +++ b/backport-CVE-2021-25220.patch @@ -0,0 +1,208 @@ +Conflict: NA +Reference: https://gitlab.isc.org/isc-projects/bind9/-/commit/f1bc36f19362f9f2173bf9511e85781058f19c64 +diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c +index dd82f273a4d5a2d34edd1cbcba8c9daf78a71b34..677384b1081d060ccc0acc92e476eb7664577806 100644 +--- a/lib/dns/resolver.c ++++ b/lib/dns/resolver.c +@@ -65,6 +65,8 @@ + #include + #include + #include ++#include ++ + #ifdef WANT_QUERYTRACE + #define RTRACE(m) \ + isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER, \ +@@ -339,6 +341,8 @@ 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. +@@ -3766,6 +3770,7 @@ 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)) + { +@@ -5155,6 +5160,9 @@ 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; +@@ -5217,6 +5225,7 @@ 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) { +@@ -7120,6 +7129,107 @@ 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) { +@@ -7146,7 +7256,7 @@ 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; +@@ -8770,6 +8880,13 @@ 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. +@@ -9083,13 +9200,11 @@ 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; + + /* +@@ -9476,7 +9591,10 @@ 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; diff --git a/CVE-2022-0396.patch b/backport-CVE-2022-0396.patch similarity index 100% rename from CVE-2022-0396.patch rename to backport-CVE-2022-0396.patch diff --git a/bind.spec b/bind.spec index 1b2cb9e..92fe68e 100644 --- a/bind.spec +++ b/bind.spec @@ -30,7 +30,7 @@ Summary: The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv Name: bind License: MPLv2.0 Version: 9.16.23 -Release: 7 +Release: 8 Epoch: 32 Url: https://www.isc.org/downloads/bind/ # @@ -79,7 +79,8 @@ Patch157:bind-9.11-fips-tests.patch # https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/2689 Patch164:bind-9.11-rh1666814.patch -Patch6000:CVE-2022-0396.patch +Patch6000:backport-CVE-2022-0396.patch +Patch6001:backport-CVE-2021-25220.patch Patch9000:bugfix-limit-numbers-of-test-threads.patch %{?systemd_ordering} @@ -376,6 +377,7 @@ in HTML and PDF format. %patch9000 -p1 %patch6000 -p1 +%patch6001 -p1 %if %{with PKCS11} %patch135 -p1 -b .config-pkcs11 @@ -1098,6 +1100,12 @@ fi; %endif %changelog +* Mon Apr 11 2022 jiangheng - 9.16.23-8 +- Type:CVE +- CVE:CVE-2021-25220 +- SUG:NA +- DESC:fix CVE-2021-25220 + * Wed Mar 30 2022 jiangheng - 9.16.23-7 - Type:CVE - CVE:CVE-2022-0396 -- Gitee