diff options
Diffstat (limited to 'dev-libs/openssl/files/openssl-3.2.1-CVE-2024-2511.patch')
| -rw-r--r-- | dev-libs/openssl/files/openssl-3.2.1-CVE-2024-2511.patch | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/dev-libs/openssl/files/openssl-3.2.1-CVE-2024-2511.patch b/dev-libs/openssl/files/openssl-3.2.1-CVE-2024-2511.patch new file mode 100644 index 000000000000..d5b40447d745 --- /dev/null +++ b/dev-libs/openssl/files/openssl-3.2.1-CVE-2024-2511.patch @@ -0,0 +1,137 @@ +https://www.openssl.org/news/secadv/20240408.txt +https://bugs.gentoo.org/930047 +https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08 +https://github.com/openssl/openssl/commit/4d67109432646c113887b0aa8091fb0d1b3057e6 + +From e9d7083e241670332e0443da0f0d4ffb52829f08 Mon Sep 17 00:00:00 2001 +From: Matt Caswell <matt@openssl.org> +Date: Tue, 5 Mar 2024 15:43:53 +0000 +Subject: [PATCH] Fix unconstrained session cache growth in TLSv1.3 + +In TLSv1.3 we create a new session object for each ticket that we send. +We do this by duplicating the original session. If SSL_OP_NO_TICKET is in +use then the new session will be added to the session cache. However, if +early data is not in use (and therefore anti-replay protection is being +used), then multiple threads could be resuming from the same session +simultaneously. If this happens and a problem occurs on one of the threads, +then the original session object could be marked as not_resumable. When we +duplicate the session object this not_resumable status gets copied into the +new session object. The new session object is then added to the session +cache even though it is not_resumable. + +Subsequently, another bug means that the session_id_length is set to 0 for +sessions that are marked as not_resumable - even though that session is +still in the cache. Once this happens the session can never be removed from +the cache. When that object gets to be the session cache tail object the +cache never shrinks again and grows indefinitely. + +CVE-2024-2511 + +Reviewed-by: Neil Horman <nhorman@openssl.org> +Reviewed-by: Tomas Mraz <tomas@openssl.org> +(Merged from https://github.com/openssl/openssl/pull/24043) +--- a/ssl/ssl_lib.c ++++ b/ssl/ssl_lib.c +@@ -4457,9 +4457,10 @@ void ssl_update_cache(SSL_CONNECTION *s, int mode) + + /* + * If the session_id_length is 0, we are not supposed to cache it, and it +- * would be rather hard to do anyway :-) ++ * would be rather hard to do anyway :-). Also if the session has already ++ * been marked as not_resumable we should not cache it for later reuse. + */ +- if (s->session->session_id_length == 0) ++ if (s->session->session_id_length == 0 || s->session->not_resumable) + return; + + /* +--- a/ssl/ssl_sess.c ++++ b/ssl/ssl_sess.c +@@ -127,16 +127,11 @@ SSL_SESSION *SSL_SESSION_new(void) + return ss; + } + +-SSL_SESSION *SSL_SESSION_dup(const SSL_SESSION *src) +-{ +- return ssl_session_dup(src, 1); +-} +- + /* + * Create a new SSL_SESSION and duplicate the contents of |src| into it. If + * ticket == 0 then no ticket information is duplicated, otherwise it is. + */ +-SSL_SESSION *ssl_session_dup(const SSL_SESSION *src, int ticket) ++static SSL_SESSION *ssl_session_dup_intern(const SSL_SESSION *src, int ticket) + { + SSL_SESSION *dest; + +@@ -265,6 +260,27 @@ SSL_SESSION *ssl_session_dup(const SSL_SESSION *src, int ticket) + return NULL; + } + ++SSL_SESSION *SSL_SESSION_dup(const SSL_SESSION *src) ++{ ++ return ssl_session_dup_intern(src, 1); ++} ++ ++/* ++ * Used internally when duplicating a session which might be already shared. ++ * We will have resumed the original session. Subsequently we might have marked ++ * it as non-resumable (e.g. in another thread) - but this copy should be ok to ++ * resume from. ++ */ ++SSL_SESSION *ssl_session_dup(const SSL_SESSION *src, int ticket) ++{ ++ SSL_SESSION *sess = ssl_session_dup_intern(src, ticket); ++ ++ if (sess != NULL) ++ sess->not_resumable = 0; ++ ++ return sess; ++} ++ + const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) + { + if (len) +--- a/ssl/statem/statem_srvr.c ++++ b/ssl/statem/statem_srvr.c +@@ -2445,9 +2445,8 @@ CON_FUNC_RETURN tls_construct_server_hello(SSL_CONNECTION *s, WPACKET *pkt) + * so the following won't overwrite an ID that we're supposed + * to send back. + */ +- if (s->session->not_resumable || +- (!(SSL_CONNECTION_GET_CTX(s)->session_cache_mode & SSL_SESS_CACHE_SERVER) +- && !s->hit)) ++ if (!(SSL_CONNECTION_GET_CTX(s)->session_cache_mode & SSL_SESS_CACHE_SERVER) ++ && !s->hit) + s->session->session_id_length = 0; + + if (usetls13) { + +From 4d67109432646c113887b0aa8091fb0d1b3057e6 Mon Sep 17 00:00:00 2001 +From: Matt Caswell <matt@openssl.org> +Date: Fri, 15 Mar 2024 17:58:42 +0000 +Subject: [PATCH] Hardening around not_resumable sessions + +Make sure we can't inadvertently use a not_resumable session + +Related to CVE-2024-2511 + +Reviewed-by: Neil Horman <nhorman@openssl.org> +Reviewed-by: Tomas Mraz <tomas@openssl.org> +(Merged from https://github.com/openssl/openssl/pull/24043) +--- a/ssl/ssl_sess.c ++++ b/ssl/ssl_sess.c +@@ -519,6 +519,12 @@ SSL_SESSION *lookup_sess_in_cache(SSL_CONNECTION *s, + sess_id, sess_id_len, ©); + + if (ret != NULL) { ++ if (ret->not_resumable) { ++ /* If its not resumable then ignore this session */ ++ if (!copy) ++ SSL_SESSION_free(ret); ++ return NULL; ++ } + ssl_tsan_counter(s->session_ctx, + &s->session_ctx->stats.sess_cb_hit); + |