Merge pull request #894 from imaqsood/PA-6699-CVE-2024-5535-openssl-3.0

Author: joshcooper

configs/components/openssl-3.0.rb

@@ -121,6 +121,9 @@
     'no-whirlpool'
   ]
 
+  # Remove this in 3.0.15 or later
+  pkg.apply_patch 'resources/patches/openssl/CVE-2024-5535.patch'
+
   if settings[:use_legacy_openssl_algos]
     pkg.apply_patch 'resources/patches/openssl/openssl-3-activate-legacy-algos.patch'
   else

resources/patches/openssl/CVE-2024-5535.patch

@@ -0,0 +1,106 @@
+From cf6f91f6121f4db167405db2f0de410a456f260c Fri May 31 11:14:33 2024 +0100
+author Matt Caswell <[email protected]> Fri May 31 11:14:33 2024 +0100
+committer Matt Caswell <[email protected]> Thu Jun 27 10:39:47 2024 +0100
+
+Fix SSL_select_next_proto
+
+Ensure that the provided client list is non-NULL and starts with a valid
+entry. When called from the ALPN callback the client list should already
+have been validated by OpenSSL so this should not cause a problem. When
+called from the NPN callback the client list is locally configured and
+will not have already been validated. Therefore SSL_select_next_proto
+should not assume that it is correctly formatted.
+
+We implement stricter checking of the client protocol list. We also do the
+same for the server list while we are about it.
+
+CVE-2024-5535
+
+Reviewed-by: Neil Horman <[email protected]>
+Reviewed-by: Tomas Mraz <[email protected]>
+(Merged from https://github.com/openssl/openssl/pull/24718)
+
+(cherry picked from commit 4ada436a1946cbb24db5ab4ca082b69c1bc10f37)
+
+diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
+index cb4e006ea7..e628140dfa 100644
+--- a/ssl/ssl_lib.c
++++ b/ssl/ssl_lib.c
+@@ -2952,37 +2952,54 @@ int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
+                           unsigned int server_len,
+                           const unsigned char *client, unsigned int client_len)
+ {
+-    unsigned int i, j;
+-    const unsigned char *result;
+-    int status = OPENSSL_NPN_UNSUPPORTED;
++    PACKET cpkt, csubpkt, spkt, ssubpkt;
++
++    if (!PACKET_buf_init(&cpkt, client, client_len)
++            || !PACKET_get_length_prefixed_1(&cpkt, &csubpkt)
++            || PACKET_remaining(&csubpkt) == 0) {
++        *out = NULL;
++        *outlen = 0;
++        return OPENSSL_NPN_NO_OVERLAP;
++    }
++
++    /*
++     * Set the default opportunistic protocol. Will be overwritten if we find
++     * a match.
++     */
++    *out = (unsigned char *)PACKET_data(&csubpkt);
++    *outlen = (unsigned char)PACKET_remaining(&csubpkt);
+ 
+     /*
+      * For each protocol in server preference order, see if we support it.
+      */
+-    for (i = 0; i < server_len;) {
+-        for (j = 0; j < client_len;) {
+-            if (server[i] == client[j] &&
+-                memcmp(&server[i + 1], &client[j + 1], server[i]) == 0) {
+-                /* We found a match */
+-                result = &server[i];
+-                status = OPENSSL_NPN_NEGOTIATED;
+-                goto found;
++    if (PACKET_buf_init(&spkt, server, server_len)) {
++        while (PACKET_get_length_prefixed_1(&spkt, &ssubpkt)) {
++            if (PACKET_remaining(&ssubpkt) == 0)
++                continue; /* Invalid - ignore it */
++            if (PACKET_buf_init(&cpkt, client, client_len)) {
++                while (PACKET_get_length_prefixed_1(&cpkt, &csubpkt)) {
++                    if (PACKET_equal(&csubpkt, PACKET_data(&ssubpkt),
++                                     PACKET_remaining(&ssubpkt))) {
++                        /* We found a match */
++                        *out = (unsigned char *)PACKET_data(&ssubpkt);
++                        *outlen = (unsigned char)PACKET_remaining(&ssubpkt);
++                        return OPENSSL_NPN_NEGOTIATED;
++                    }
++                }
++                /* Ignore spurious trailing bytes in the client list */
++            } else {
++                /* This should never happen */
++                return OPENSSL_NPN_NO_OVERLAP;
+             }
+-            j += client[j];
+-            j++;
+         }
+-        i += server[i];
+-        i++;
++        /* Ignore spurious trailing bytes in the server list */
+     }
+ 
+-    /* There's no overlap between our protocols and the server's list. */
+-    result = client;
+-    status = OPENSSL_NPN_NO_OVERLAP;
+-
+- found:
+-    *out = (unsigned char *)result + 1;
+-    *outlen = result[0];
+-    return status;
++    /*
++     * There's no overlap between our protocols and the server's list. We use
++     * the default opportunistic protocol selected earlier
++     */
++    return OPENSSL_NPN_NO_OVERLAP;
+ }
+ 
+ #ifndef OPENSSL_NO_NEXTPROTONEG