Backport patch from <https://gitlab.isc.org/isc-projects/bind9/ commit/8d807cc21655eaa6e6a08afafeec3682c0f3f2ab> to solve CVE-2020-8623.
Signed-off-by: Li Zhou <li.z...@windriver.com> --- .../bind/bind/CVE-2020-8623.patch | 402 +++++++++++++++++++++ meta/recipes-connectivity/bind/bind_9.11.19.bb | 1 + 2 files changed, 403 insertions(+) create mode 100644 meta/recipes-connectivity/bind/bind/CVE-2020-8623.patch diff --git a/meta/recipes-connectivity/bind/bind/CVE-2020-8623.patch b/meta/recipes-connectivity/bind/bind/CVE-2020-8623.patch new file mode 100644 index 0000000..8e5412a --- /dev/null +++ b/meta/recipes-connectivity/bind/bind/CVE-2020-8623.patch @@ -0,0 +1,402 @@ +From 8d807cc21655eaa6e6a08afafeec3682c0f3f2ab Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ond...@isc.org> +Date: Tue, 21 Jul 2020 14:42:47 +0200 +Subject: [PATCH] Fix crash in pk11_numbits() when native-pkcs11 is used + +When pk11_numbits() is passed a user provided input that contains all +zeroes (via crafted DNS message), it would crash with assertion +failure. Fix that by properly handling such input. + +Upstream-Status: Backport +CVE: CVE-2020-8623 +Signed-off-by: Li Zhou <li.z...@windriver.com> +--- + lib/dns/pkcs11dh_link.c | 15 ++++++- + lib/dns/pkcs11dsa_link.c | 8 +++- + lib/dns/pkcs11rsa_link.c | 79 +++++++++++++++++++++++++-------- + lib/isc/include/pk11/internal.h | 3 +- + lib/isc/pk11.c | 61 ++++++++++++++++--------- + 5 files changed, 121 insertions(+), 45 deletions(-) + +diff --git a/lib/dns/pkcs11dh_link.c b/lib/dns/pkcs11dh_link.c +index e2b60ea7c5..4cd8e32d60 100644 +--- a/lib/dns/pkcs11dh_link.c ++++ b/lib/dns/pkcs11dh_link.c +@@ -748,6 +748,7 @@ pkcs11dh_fromdns(dst_key_t *key, isc_buffer_t *data) { + CK_BYTE *prime = NULL, *base = NULL, *pub = NULL; + CK_ATTRIBUTE *attr; + int special = 0; ++ unsigned int bits; + isc_result_t result; + + isc_buffer_remainingregion(data, &r); +@@ -852,7 +853,11 @@ pkcs11dh_fromdns(dst_key_t *key, isc_buffer_t *data) { + pub = r.base; + isc_region_consume(&r, publen); + +- key->key_size = pk11_numbits(prime, plen_); ++ result = pk11_numbits(prime, plen_, &bits); ++ if (result != ISC_R_SUCCESS) { ++ goto cleanup; ++ } ++ key->key_size = bits; + + dh->repr = (CK_ATTRIBUTE *) isc_mem_get(key->mctx, sizeof(*attr) * 3); + if (dh->repr == NULL) +@@ -1012,6 +1017,7 @@ pkcs11dh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + dst_private_t priv; + isc_result_t ret; + int i; ++ unsigned int bits; + pk11_object_t *dh = NULL; + CK_ATTRIBUTE *attr; + isc_mem_t *mctx; +@@ -1082,7 +1088,12 @@ pkcs11dh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(dh, CKA_PRIME); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +diff --git a/lib/dns/pkcs11dsa_link.c b/lib/dns/pkcs11dsa_link.c +index 12d707a112..24d4c149ff 100644 +--- a/lib/dns/pkcs11dsa_link.c ++++ b/lib/dns/pkcs11dsa_link.c +@@ -983,6 +983,7 @@ pkcs11dsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + dst_private_t priv; + isc_result_t ret; + int i; ++ unsigned int bits; + pk11_object_t *dsa = NULL; + CK_ATTRIBUTE *attr; + isc_mem_t *mctx = key->mctx; +@@ -1072,7 +1073,12 @@ pkcs11dsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(dsa, CKA_PRIME); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +diff --git a/lib/dns/pkcs11rsa_link.c b/lib/dns/pkcs11rsa_link.c +index 096c1a8e91..1d10d26564 100644 +--- a/lib/dns/pkcs11rsa_link.c ++++ b/lib/dns/pkcs11rsa_link.c +@@ -332,6 +332,7 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + key->key_alg == DST_ALG_RSASHA256 || + key->key_alg == DST_ALG_RSASHA512); + #endif ++ REQUIRE(maxbits <= RSA_MAX_PUBEXP_BITS); + + /* + * Reject incorrect RSA key lengths. +@@ -376,6 +377,7 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + for (attr = pk11_attribute_first(rsa); + attr != NULL; + attr = pk11_attribute_next(rsa, attr)) ++ { + switch (attr->type) { + case CKA_MODULUS: + INSIST(keyTemplate[5].type == attr->type); +@@ -396,12 +398,16 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + memmove(keyTemplate[6].pValue, attr->pValue, + attr->ulValueLen); + keyTemplate[6].ulValueLen = attr->ulValueLen; +- if (pk11_numbits(attr->pValue, +- attr->ulValueLen) > maxbits && +- maxbits != 0) ++ unsigned int bits; ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, ++ &bits); ++ if (ret != ISC_R_SUCCESS || ++ (bits > maxbits && maxbits != 0)) { + DST_RET(DST_R_VERIFYFAILURE); ++ } + break; + } ++ } + pk11_ctx->object = CK_INVALID_HANDLE; + pk11_ctx->ontoken = false; + PK11_RET(pkcs_C_CreateObject, +@@ -1072,6 +1078,7 @@ pkcs11rsa_verify(dst_context_t *dctx, const isc_region_t *sig) { + keyTemplate[5].ulValueLen = attr->ulValueLen; + break; + case CKA_PUBLIC_EXPONENT: ++ unsigned int bits; + INSIST(keyTemplate[6].type == attr->type); + keyTemplate[6].pValue = isc_mem_get(dctx->mctx, + attr->ulValueLen); +@@ -1080,10 +1087,12 @@ pkcs11rsa_verify(dst_context_t *dctx, const isc_region_t *sig) { + memmove(keyTemplate[6].pValue, attr->pValue, + attr->ulValueLen); + keyTemplate[6].ulValueLen = attr->ulValueLen; +- if (pk11_numbits(attr->pValue, +- attr->ulValueLen) +- > RSA_MAX_PUBEXP_BITS) ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, ++ &bits); ++ if (ret != ISC_R_SUCCESS || bits > RSA_MAX_PUBEXP_BITS) ++ { + DST_RET(DST_R_VERIFYFAILURE); ++ } + break; + } + pk11_ctx->object = CK_INVALID_HANDLE; +@@ -1461,6 +1470,8 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + CK_BYTE *exponent = NULL, *modulus = NULL; + CK_ATTRIBUTE *attr; + unsigned int length; ++ unsigned int bits; ++ isc_result_t ret = ISC_R_SUCCESS; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) +@@ -1478,9 +1489,7 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + + if (e_bytes == 0) { + if (r.length < 2) { +- isc_safe_memwipe(rsa, sizeof(*rsa)); +- isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (DST_R_INVALIDPUBLICKEY); ++ DST_RET(DST_R_INVALIDPUBLICKEY); + } + e_bytes = (*r.base) << 8; + isc_region_consume(&r, 1); +@@ -1489,16 +1498,18 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + } + + if (r.length < e_bytes) { +- isc_safe_memwipe(rsa, sizeof(*rsa)); +- isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (DST_R_INVALIDPUBLICKEY); ++ DST_RET(DST_R_INVALIDPUBLICKEY); + } + exponent = r.base; + isc_region_consume(&r, e_bytes); + modulus = r.base; + mod_bytes = r.length; + +- key->key_size = pk11_numbits(modulus, mod_bytes); ++ ret = pk11_numbits(modulus, mod_bytes, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + isc_buffer_forward(data, length); + +@@ -1548,9 +1559,12 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + rsa->repr, + rsa->attrcnt * sizeof(*attr)); + } ++ ret = ISC_R_NOMEMORY; ++ ++ err: + isc_safe_memwipe(rsa, sizeof(*rsa)); + isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (ISC_R_NOMEMORY); ++ return (ret); + } + + static isc_result_t +@@ -1729,6 +1743,7 @@ pkcs11rsa_fetch(dst_key_t *key, const char *engine, const char *label, + pk11_object_t *pubrsa; + pk11_context_t *pk11_ctx = NULL; + isc_result_t ret; ++ unsigned int bits; + + if (label == NULL) + return (DST_R_NOENGINE); +@@ -1815,7 +1830,11 @@ pkcs11rsa_fetch(dst_key_t *key, const char *engine, const char *label, + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +@@ -1901,6 +1920,7 @@ pkcs11rsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + CK_ATTRIBUTE *attr; + isc_mem_t *mctx = key->mctx; + const char *engine = NULL, *label = NULL; ++ unsigned int bits; + + /* read private key file */ + ret = dst__privstruct_parse(key, DST_ALG_RSA, lexer, mctx, &priv); +@@ -2044,12 +2064,22 @@ pkcs11rsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + attr = pk11_attribute_bytype(rsa, CKA_PUBLIC_EXPONENT); + INSIST(attr != NULL); +- if (pk11_numbits(attr->pValue, attr->ulValueLen) > RSA_MAX_PUBEXP_BITS) ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ if (bits > RSA_MAX_PUBEXP_BITS) { + DST_RET(ISC_R_RANGE); ++ } + + dst__privstruct_free(&priv, mctx); + isc_safe_memwipe(&priv, sizeof(priv)); +@@ -2084,6 +2114,7 @@ pkcs11rsa_fromlabel(dst_key_t *key, const char *engine, const char *label, + pk11_context_t *pk11_ctx = NULL; + isc_result_t ret; + unsigned int i; ++ unsigned int bits; + + UNUSED(pin); + +@@ -2178,12 +2209,22 @@ pkcs11rsa_fromlabel(dst_key_t *key, const char *engine, const char *label, + + attr = pk11_attribute_bytype(rsa, CKA_PUBLIC_EXPONENT); + INSIST(attr != NULL); +- if (pk11_numbits(attr->pValue, attr->ulValueLen) > RSA_MAX_PUBEXP_BITS) ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ if (bits > RSA_MAX_PUBEXP_BITS) { + DST_RET(ISC_R_RANGE); ++ } + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + pk11_return_session(pk11_ctx); + isc_safe_memwipe(pk11_ctx, sizeof(*pk11_ctx)); +diff --git a/lib/isc/include/pk11/internal.h b/lib/isc/include/pk11/internal.h +index aa8907ab08..7cc8ec812b 100644 +--- a/lib/isc/include/pk11/internal.h ++++ b/lib/isc/include/pk11/internal.h +@@ -25,7 +25,8 @@ void pk11_mem_put(void *ptr, size_t size); + + CK_SLOT_ID pk11_get_best_token(pk11_optype_t optype); + +-unsigned int pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt); ++isc_result_t ++pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt, unsigned int *bits); + + CK_ATTRIBUTE *pk11_attribute_first(const pk11_object_t *obj); + +diff --git a/lib/isc/pk11.c b/lib/isc/pk11.c +index 012afd968a..4e4052044b 100644 +--- a/lib/isc/pk11.c ++++ b/lib/isc/pk11.c +@@ -962,13 +962,15 @@ pk11_get_best_token(pk11_optype_t optype) { + return (token->slotid); + } + +-unsigned int +-pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt) { ++isc_result_t ++pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt, unsigned int *bits) { + unsigned int bitcnt, i; + CK_BYTE top; + +- if (bytecnt == 0) +- return (0); ++ if (bytecnt == 0) { ++ *bits = 0; ++ return (ISC_R_SUCCESS); ++ } + bitcnt = bytecnt * 8; + for (i = 0; i < bytecnt; i++) { + top = data[i]; +@@ -976,26 +978,41 @@ pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt) { + bitcnt -= 8; + continue; + } +- if (top & 0x80) +- return (bitcnt); +- if (top & 0x40) +- return (bitcnt - 1); +- if (top & 0x20) +- return (bitcnt - 2); +- if (top & 0x10) +- return (bitcnt - 3); +- if (top & 0x08) +- return (bitcnt - 4); +- if (top & 0x04) +- return (bitcnt - 5); +- if (top & 0x02) +- return (bitcnt - 6); +- if (top & 0x01) +- return (bitcnt - 7); ++ if (top & 0x80) { ++ *bits = bitcnt; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x40) { ++ *bits = bitcnt - 1; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x20) { ++ *bits = bitcnt - 2; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x10) { ++ *bits = bitcnt - 3; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x08) { ++ *bits = bitcnt - 4; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x04) { ++ *bits = bitcnt - 5; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x02) { ++ *bits = bitcnt - 6; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x01) { ++ *bits = bitcnt - 7; ++ return (ISC_R_SUCCESS); ++ } + break; + } +- INSIST(0); +- ISC_UNREACHABLE(); ++ return (ISC_R_RANGE); + } + + CK_ATTRIBUTE * +-- +2.17.1 + diff --git a/meta/recipes-connectivity/bind/bind_9.11.19.bb b/meta/recipes-connectivity/bind/bind_9.11.19.bb index 0bfd579..aed1a73 100644 --- a/meta/recipes-connectivity/bind/bind_9.11.19.bb +++ b/meta/recipes-connectivity/bind/bind_9.11.19.bb @@ -19,6 +19,7 @@ SRC_URI = "https://ftp.isc.org/isc/bind9/${PV}/${BPN}-${PV}.tar.gz \ file://0001-named-lwresd-V-and-start-log-hide-build-options.patch \ file://0001-avoid-start-failure-with-bind-user.patch \ file://CVE-2020-8622.patch \ + file://CVE-2020-8623.patch \ " SRC_URI[sha256sum] = "0dee554a4caa368948b32da9a0c97b516c19103bc13ff5b3762c5d8552f52329" -- 1.9.1
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