Prevent exahustion of memory from control channel (CVE-2023-3341)
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SOURCES/bind-9.16-CVE-2023-3341.patch
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152
SOURCES/bind-9.16-CVE-2023-3341.patch
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@ -0,0 +1,152 @@
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diff --git a/lib/isccc/cc.c b/lib/isccc/cc.c
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index b548a7a7bf..5a716bdcf2 100644
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--- a/lib/isccc/cc.c
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+++ b/lib/isccc/cc.c
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@@ -54,6 +54,10 @@
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#define MAX_TAGS 256
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#define DUP_LIFETIME 900
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+#ifndef ISCCC_MAXDEPTH
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+#define ISCCC_MAXDEPTH \
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+ 10 /* Big enough for rndc which just sends a string each way. */
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+#endif
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typedef isccc_sexpr_t *sexpr_ptr;
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@@ -486,19 +490,25 @@ verify(isccc_sexpr_t *alist, unsigned char *data, unsigned int length,
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static isc_result_t
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table_fromwire(isccc_region_t *source, isccc_region_t *secret,
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- uint32_t algorithm, isccc_sexpr_t **alistp);
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+ uint32_t algorithm, unsigned int depth, isccc_sexpr_t **alistp);
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static isc_result_t
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-list_fromwire(isccc_region_t *source, isccc_sexpr_t **listp);
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+list_fromwire(isccc_region_t *source, unsigned int depth,
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+ isccc_sexpr_t **listp);
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static isc_result_t
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-value_fromwire(isccc_region_t *source, isccc_sexpr_t **valuep) {
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+value_fromwire(isccc_region_t *source, unsigned int depth,
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+ isccc_sexpr_t **valuep) {
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unsigned int msgtype;
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uint32_t len;
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isccc_sexpr_t *value;
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isccc_region_t active;
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isc_result_t result;
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+ if (depth > ISCCC_MAXDEPTH) {
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+ return (ISCCC_R_MAXDEPTH);
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+ }
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+
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if (REGION_SIZE(*source) < 1 + 4) {
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return (ISC_R_UNEXPECTEDEND);
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}
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@@ -519,9 +529,9 @@ value_fromwire(isccc_region_t *source, isccc_sexpr_t **valuep) {
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result = ISC_R_NOMEMORY;
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}
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} else if (msgtype == ISCCC_CCMSGTYPE_TABLE) {
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- result = table_fromwire(&active, NULL, 0, valuep);
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+ result = table_fromwire(&active, NULL, 0, depth + 1, valuep);
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} else if (msgtype == ISCCC_CCMSGTYPE_LIST) {
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- result = list_fromwire(&active, valuep);
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+ result = list_fromwire(&active, depth + 1, valuep);
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} else {
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result = ISCCC_R_SYNTAX;
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}
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@@ -531,7 +541,7 @@ value_fromwire(isccc_region_t *source, isccc_sexpr_t **valuep) {
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static isc_result_t
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table_fromwire(isccc_region_t *source, isccc_region_t *secret,
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- uint32_t algorithm, isccc_sexpr_t **alistp) {
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+ uint32_t algorithm, unsigned int depth, isccc_sexpr_t **alistp) {
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char key[256];
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uint32_t len;
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isc_result_t result;
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@@ -541,6 +551,10 @@ table_fromwire(isccc_region_t *source, isccc_region_t *secret,
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REQUIRE(alistp != NULL && *alistp == NULL);
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+ if (depth > ISCCC_MAXDEPTH) {
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+ return (ISCCC_R_MAXDEPTH);
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+ }
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+
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checksum_rstart = NULL;
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first_tag = true;
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alist = isccc_alist_create();
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@@ -557,7 +571,7 @@ table_fromwire(isccc_region_t *source, isccc_region_t *secret,
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GET_MEM(key, len, source->rstart);
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key[len] = '\0'; /* Ensure NUL termination. */
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value = NULL;
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- result = value_fromwire(source, &value);
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+ result = value_fromwire(source, depth + 1, &value);
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if (result != ISC_R_SUCCESS) {
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goto bad;
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}
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@@ -595,14 +609,19 @@ bad:
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}
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static isc_result_t
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-list_fromwire(isccc_region_t *source, isccc_sexpr_t **listp) {
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+list_fromwire(isccc_region_t *source, unsigned int depth,
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+ isccc_sexpr_t **listp) {
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isccc_sexpr_t *list, *value;
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isc_result_t result;
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+ if (depth > ISCCC_MAXDEPTH) {
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+ return (ISCCC_R_MAXDEPTH);
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+ }
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+
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list = NULL;
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while (!REGION_EMPTY(*source)) {
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value = NULL;
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- result = value_fromwire(source, &value);
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+ result = value_fromwire(source, depth + 1, &value);
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if (result != ISC_R_SUCCESS) {
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isccc_sexpr_free(&list);
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return (result);
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@@ -634,7 +653,7 @@ isccc_cc_fromwire(isccc_region_t *source, isccc_sexpr_t **alistp,
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return (ISCCC_R_UNKNOWNVERSION);
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}
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- return (table_fromwire(source, secret, algorithm, alistp));
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+ return (table_fromwire(source, secret, algorithm, 0, alistp));
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}
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static isc_result_t
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diff --git a/lib/isccc/include/isccc/result.h b/lib/isccc/include/isccc/result.h
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index 0f0b0f6534..56f9c386e0 100644
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--- a/lib/isccc/include/isccc/result.h
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+++ b/lib/isccc/include/isccc/result.h
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@@ -35,8 +35,10 @@
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#define ISCCC_R_CLOCKSKEW (ISC_RESULTCLASS_ISCCC + 4)
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/*% Duplicate */
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#define ISCCC_R_DUPLICATE (ISC_RESULTCLASS_ISCCC + 5)
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+/*% Maximum recursion depth */
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+#define ISCCC_R_MAXDEPTH (ISC_RESULTCLASS_ISCCC + 6)
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-#define ISCCC_R_NRESULTS 6 /*%< Number of results */
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+#define ISCCC_R_NRESULTS 7 /*%< Number of results */
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ISC_LANG_BEGINDECLS
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diff --git a/lib/isccc/result.c b/lib/isccc/result.c
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index 1498c2a859..127dd77e3b 100644
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--- a/lib/isccc/result.c
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+++ b/lib/isccc/result.c
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@@ -25,12 +25,14 @@ static const char *text[ISCCC_R_NRESULTS] = {
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"bad auth", /* 3 */
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"expired", /* 4 */
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"clock skew", /* 5 */
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- "duplicate" /* 6 */
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+ "duplicate", /* 6 */
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+ "max depth" /* 7 */
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};
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static const char *ids[ISCCC_R_NRESULTS] = {
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"ISCCC_R_UNKNOWNVERSION", "ISCCC_R_SYNTAX", "ISCCC_R_BADAUTH",
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"ISCCC_R_EXPIRED", "ISCCC_R_CLOCKSKEW", "ISCCC_R_DUPLICATE",
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+ "ISCCC_R_MAXDEPTH"
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};
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#define ISCCC_RESULT_RESULTSET 2
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@ -57,7 +57,7 @@ Summary: The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
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Name: bind9.16
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License: MPLv2.0
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Version: 9.16.23
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Release: 0.14%{?dist}.1.alma
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Release: 0.14%{?dist}.2.alma.1
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Epoch: 32
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Url: https://www.isc.org/downloads/bind/
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#
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@ -129,6 +129,7 @@ Patch187: bind-9.16-CVE-2022-3924.patch
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# Patch is taken from bind upstream gitlab and updated to apply correctly:
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# https://gitlab.isc.org/isc-projects/bind9/commit/f1d9e9ee3859976f403914d20ad2a10855343702
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Patch188: bind-9.16-CVE-2023-2828.patch
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Patch189: bind-9.16-CVE-2023-3341.patch
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%{?systemd_ordering}
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Requires: coreutils
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@ -441,6 +442,7 @@ in HTML and PDF format.
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%patch186 -p1 -b .CVE-2022-3736
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%patch187 -p1 -b .CVE-2022-3924
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%patch188 -p1 -b .CVE-2023-2828
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%patch189 -p1 -b .CVE-2023-3341
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%if %{with PKCS11}
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%patch135 -p1 -b .config-pkcs11
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@ -1160,6 +1162,9 @@ fi;
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%endif
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%changelog
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* Thu Oct 05 2023 Andrew Lukoshko <alukoshko@almalinux.org> - 32:9.16.23-0.14.2.alma
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- Prevent exahustion of memory from control channel (CVE-2023-3341)
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* Mon Jul 17 2023 Andrew Lukoshko <alukoshko@almalinux.org> - 32:9.16.23-0.14.1.alma
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- Improve RBT overmem cache cleaning (CVE-2023-2828)
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