diff options
Diffstat (limited to 'meta-networking/recipes-support/strongswan/files/CVE-2021-45079.patch')
-rw-r--r-- | meta-networking/recipes-support/strongswan/files/CVE-2021-45079.patch | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/meta-networking/recipes-support/strongswan/files/CVE-2021-45079.patch b/meta-networking/recipes-support/strongswan/files/CVE-2021-45079.patch new file mode 100644 index 0000000000..97aa6a0efc --- /dev/null +++ b/meta-networking/recipes-support/strongswan/files/CVE-2021-45079.patch @@ -0,0 +1,156 @@ +From 76968cdd6b79f6ae40d674554e902ced192fd33e Mon Sep 17 00:00:00 2001 +From: Tobias Brunner <tobias@strongswan.org> +Date: Tue, 14 Dec 2021 10:51:35 +0100 +Subject: [PATCH] eap-authenticator: Enforce failure if MSK generation fails + +Without this, the authentication succeeded if the server sent an early +EAP-Success message for mutual, key-generating EAP methods like EAP-TLS, +which may be used in EAP-only scenarios but would complete without server +or client authentication. For clients configured for such EAP-only +scenarios, a rogue server could capture traffic after the tunnel is +established or even access hosts behind the client. For non-mutual EAP +methods, public key server authentication has been enforced for a while. + +A server previously could also crash a client by sending an EAP-Success +immediately without initiating an actual EAP method. + +Fixes: 0706c39cda52 ("added support for EAP methods not establishing an MSK") +Fixes: CVE-2021-45079 + +Upstream-Status: Backport [https://download.strongswan.org/security/CVE-2021-45079/strongswan-5.5.0-5.9.4_eap_success.patch] +CVE: CVE-2021-45079 +Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com> + +--- + src/libcharon/plugins/eap_gtc/eap_gtc.c | 2 +- + src/libcharon/plugins/eap_md5/eap_md5.c | 2 +- + src/libcharon/plugins/eap_radius/eap_radius.c | 4 ++- + src/libcharon/sa/eap/eap_method.h | 8 ++++- + .../ikev2/authenticators/eap_authenticator.c | 32 ++++++++++++++++--- + 5 files changed, 40 insertions(+), 8 deletions(-) + +diff --git a/src/libcharon/plugins/eap_gtc/eap_gtc.c b/src/libcharon/plugins/eap_gtc/eap_gtc.c +index 95ba090b79ce..cffb6222c2f8 100644 +--- a/src/libcharon/plugins/eap_gtc/eap_gtc.c ++++ b/src/libcharon/plugins/eap_gtc/eap_gtc.c +@@ -195,7 +195,7 @@ METHOD(eap_method_t, get_type, eap_type_t, + METHOD(eap_method_t, get_msk, status_t, + private_eap_gtc_t *this, chunk_t *msk) + { +- return FAILED; ++ return NOT_SUPPORTED; + } + + METHOD(eap_method_t, get_identifier, uint8_t, +diff --git a/src/libcharon/plugins/eap_md5/eap_md5.c b/src/libcharon/plugins/eap_md5/eap_md5.c +index ab5f7ff6a823..3a92ad7c0a04 100644 +--- a/src/libcharon/plugins/eap_md5/eap_md5.c ++++ b/src/libcharon/plugins/eap_md5/eap_md5.c +@@ -213,7 +213,7 @@ METHOD(eap_method_t, get_type, eap_type_t, + METHOD(eap_method_t, get_msk, status_t, + private_eap_md5_t *this, chunk_t *msk) + { +- return FAILED; ++ return NOT_SUPPORTED; + } + + METHOD(eap_method_t, is_mutual, bool, +diff --git a/src/libcharon/plugins/eap_radius/eap_radius.c b/src/libcharon/plugins/eap_radius/eap_radius.c +index 2dc7a423e702..5336dead13d9 100644 +--- a/src/libcharon/plugins/eap_radius/eap_radius.c ++++ b/src/libcharon/plugins/eap_radius/eap_radius.c +@@ -733,7 +733,9 @@ METHOD(eap_method_t, get_msk, status_t, + *out = msk; + return SUCCESS; + } +- return FAILED; ++ /* we assume the selected method did not establish an MSK, if it failed ++ * to establish one, process() would have failed */ ++ return NOT_SUPPORTED; + } + + METHOD(eap_method_t, get_identifier, uint8_t, +diff --git a/src/libcharon/sa/eap/eap_method.h b/src/libcharon/sa/eap/eap_method.h +index 0b5218dfec15..33564831f86e 100644 +--- a/src/libcharon/sa/eap/eap_method.h ++++ b/src/libcharon/sa/eap/eap_method.h +@@ -114,10 +114,16 @@ struct eap_method_t { + * Not all EAP methods establish a shared secret. For implementations of + * the EAP-Identity method, get_msk() returns the received identity. + * ++ * @note Returning NOT_SUPPORTED is important for implementations of EAP ++ * methods that don't establish an MSK. In particular as client because ++ * key-generating EAP methods MUST fail to process EAP-Success messages if ++ * no MSK is established. ++ * + * @param msk chunk receiving internal stored MSK + * @return +- * - SUCCESS, or ++ * - SUCCESS, if MSK is established + * - FAILED, if MSK not established (yet) ++ * - NOT_SUPPORTED, for non-MSK-establishing methods + */ + status_t (*get_msk) (eap_method_t *this, chunk_t *msk); + +diff --git a/src/libcharon/sa/ikev2/authenticators/eap_authenticator.c b/src/libcharon/sa/ikev2/authenticators/eap_authenticator.c +index e1e6cd7ee6f3..87548fc471a6 100644 +--- a/src/libcharon/sa/ikev2/authenticators/eap_authenticator.c ++++ b/src/libcharon/sa/ikev2/authenticators/eap_authenticator.c +@@ -305,9 +305,17 @@ static eap_payload_t* server_process_eap(private_eap_authenticator_t *this, + this->method->destroy(this->method); + return server_initiate_eap(this, FALSE); + } +- if (this->method->get_msk(this->method, &this->msk) == SUCCESS) ++ switch (this->method->get_msk(this->method, &this->msk)) + { +- this->msk = chunk_clone(this->msk); ++ case SUCCESS: ++ this->msk = chunk_clone(this->msk); ++ break; ++ case NOT_SUPPORTED: ++ break; ++ case FAILED: ++ default: ++ DBG1(DBG_IKE, "failed to establish MSK"); ++ goto failure; + } + if (vendor) + { +@@ -326,6 +334,7 @@ static eap_payload_t* server_process_eap(private_eap_authenticator_t *this, + return eap_payload_create_code(EAP_SUCCESS, in->get_identifier(in)); + case FAILED: + default: ++failure: + /* type might have changed for virtual methods */ + type = this->method->get_type(this->method, &vendor); + if (vendor) +@@ -661,9 +670,24 @@ METHOD(authenticator_t, process_client, status_t, + uint32_t vendor; + auth_cfg_t *cfg; + +- if (this->method->get_msk(this->method, &this->msk) == SUCCESS) ++ if (!this->method) + { +- this->msk = chunk_clone(this->msk); ++ DBG1(DBG_IKE, "received unexpected %N", ++ eap_code_names, eap_payload->get_code(eap_payload)); ++ return FAILED; ++ } ++ switch (this->method->get_msk(this->method, &this->msk)) ++ { ++ case SUCCESS: ++ this->msk = chunk_clone(this->msk); ++ break; ++ case NOT_SUPPORTED: ++ break; ++ case FAILED: ++ default: ++ DBG1(DBG_IKE, "received %N but failed to establish MSK", ++ eap_code_names, eap_payload->get_code(eap_payload)); ++ return FAILED; + } + type = this->method->get_type(this->method, &vendor); + if (vendor) +-- +2.25.1 + |