Patch Openssl for CVE-2023-0464

Merge branch 'security-patch-openssl-for-2023-0464-backport-15-10' into '15-10-stable'

See merge request gitlab-org/security/omnibus-gitlab!332

Changelog: security

config/patches/openssl/openssl-1.1.1t-excessive-resource-use-verifying-policy-constraints.patch

+From 879f7080d7e141f415c79eaa3a8ac4a3dad0348b Mon Sep 17 00:00:00 2001
+From: Pauli <pauli@openssl.org>
+Date: Wed, 8 Mar 2023 15:28:20 +1100
+Subject: [PATCH] x509: excessive resource use verifying policy constraints
+
+A security vulnerability has been identified in all supported versions
+of OpenSSL related to the verification of X.509 certificate chains
+that include policy constraints.  Attackers may be able to exploit this
+vulnerability by creating a malicious certificate chain that triggers
+exponential use of computational resources, leading to a denial-of-service
+(DoS) attack on affected systems.
+
+Fixes CVE-2023-0464
+
+Reviewed-by: Tomas Mraz <tomas@openssl.org>
+Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
+(Merged from https://github.com/openssl/openssl/pull/20569)
+---
+ crypto/x509v3/pcy_local.h |  8 +++++++-
+ crypto/x509v3/pcy_node.c  | 12 +++++++++---
+ crypto/x509v3/pcy_tree.c  | 37 +++++++++++++++++++++++++++----------
+ 3 files changed, 43 insertions(+), 14 deletions(-)
+
+diff --git a/crypto/x509v3/pcy_local.h b/crypto/x509v3/pcy_local.h
+index 5daf78de45..344aa06765 100644
+--- a/crypto/x509v3/pcy_local.h
++++ b/crypto/x509v3/pcy_local.h
+@@ -111,6 +111,11 @@ struct X509_POLICY_LEVEL_st {
+ };
+
+ struct X509_POLICY_TREE_st {
++    /* The number of nodes in the tree */
++    size_t node_count;
++    /* The maximum number of nodes in the tree */
++    size_t node_maximum;
++
+     /* This is the tree 'level' data */
+     X509_POLICY_LEVEL *levels;
+     int nlevel;
+@@ -159,7 +164,8 @@ X509_POLICY_NODE *tree_find_sk(STACK_OF(X509_POLICY_NODE) *sk,
+ X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
+                                  X509_POLICY_DATA *data,
+                                  X509_POLICY_NODE *parent,
+-                                 X509_POLICY_TREE *tree);
++                                 X509_POLICY_TREE *tree,
++                                 int extra_data);
+ void policy_node_free(X509_POLICY_NODE *node);
+ int policy_node_match(const X509_POLICY_LEVEL *lvl,
+                       const X509_POLICY_NODE *node, const ASN1_OBJECT *oid);
+diff --git a/crypto/x509v3/pcy_node.c b/crypto/x509v3/pcy_node.c
+index e2d7b15322..d574fb9d66 100644
+--- a/crypto/x509v3/pcy_node.c
++++ b/crypto/x509v3/pcy_node.c
+@@ -59,10 +59,15 @@ X509_POLICY_NODE *level_find_node(const X509_POLICY_LEVEL *level,
+ X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
+                                  X509_POLICY_DATA *data,
+                                  X509_POLICY_NODE *parent,
+-                                 X509_POLICY_TREE *tree)
++                                 X509_POLICY_TREE *tree,
++                                 int extra_data)
+ {
+     X509_POLICY_NODE *node;
+
++    /* Verify that the tree isn't too large.  This mitigates CVE-2023-0464 */
++    if (tree->node_maximum > 0 && tree->node_count >= tree->node_maximum)
++        return NULL;
++
+     node = OPENSSL_zalloc(sizeof(*node));
+     if (node == NULL) {
+         X509V3err(X509V3_F_LEVEL_ADD_NODE, ERR_R_MALLOC_FAILURE);
+@@ -70,7 +75,7 @@ X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
+     }
+     node->data = data;
+     node->parent = parent;
+-    if (level) {
++    if (level != NULL) {
+         if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
+             if (level->anyPolicy)
+                 goto node_error;
+@@ -90,7 +95,7 @@ X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
+         }
+     }
+
+-    if (tree) {
++    if (extra_data) {
+         if (tree->extra_data == NULL)
+             tree->extra_data = sk_X509_POLICY_DATA_new_null();
+         if (tree->extra_data == NULL){
+@@ -103,6 +108,7 @@ X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
+         }
+     }
+
++    tree->node_count++;
+     if (parent)
+         parent->nchild++;
+
+diff --git a/crypto/x509v3/pcy_tree.c b/crypto/x509v3/pcy_tree.c
+index 6e8322cbc5..6c7fd35405 100644
+--- a/crypto/x509v3/pcy_tree.c
++++ b/crypto/x509v3/pcy_tree.c
+@@ -13,6 +13,18 @@
+
+ #include "pcy_local.h"
+
++/*
++ * If the maximum number of nodes in the policy tree isn't defined, set it to
++ * a generous default of 1000 nodes.
++ *
++ * Defining this to be zero means unlimited policy tree growth which opens the
++ * door on CVE-2023-0464.
++ */
++
++#ifndef OPENSSL_POLICY_TREE_NODES_MAX
++# define OPENSSL_POLICY_TREE_NODES_MAX 1000
++#endif
++
+ /*
+  * Enable this to print out the complete policy tree at various point during
+  * evaluation.
+@@ -168,6 +180,9 @@ static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
+         return X509_PCY_TREE_INTERNAL;
+     }
+
++    /* Limit the growth of the tree to mitigate CVE-2023-0464 */
++    tree->node_maximum = OPENSSL_POLICY_TREE_NODES_MAX;
++
+     /*
+      * http://tools.ietf.org/html/rfc5280#section-6.1.2, figure 3.
+      *
+@@ -184,7 +199,7 @@ static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
+     level = tree->levels;
+     if ((data = policy_data_new(NULL, OBJ_nid2obj(NID_any_policy), 0)) == NULL)
+         goto bad_tree;
+-    if (level_add_node(level, data, NULL, tree) == NULL) {
++    if (level_add_node(level, data, NULL, tree, 1) == NULL) {
+         policy_data_free(data);
+         goto bad_tree;
+     }
+@@ -243,7 +258,8 @@ static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
+  * Return value: 1 on success, 0 otherwise
+  */
+ static int tree_link_matching_nodes(X509_POLICY_LEVEL *curr,
+-                                    X509_POLICY_DATA *data)
++                                    X509_POLICY_DATA *data,
++                                    X509_POLICY_TREE *tree)
+ {
+     X509_POLICY_LEVEL *last = curr - 1;
+     int i, matched = 0;
+@@ -253,13 +269,13 @@ static int tree_link_matching_nodes(X509_POLICY_LEVEL *curr,
+         X509_POLICY_NODE *node = sk_X509_POLICY_NODE_value(last->nodes, i);
+
+         if (policy_node_match(last, node, data->valid_policy)) {
+-            if (level_add_node(curr, data, node, NULL) == NULL)
++            if (level_add_node(curr, data, node, tree, 0) == NULL)
+                 return 0;
+             matched = 1;
+         }
+     }
+     if (!matched && last->anyPolicy) {
+-        if (level_add_node(curr, data, last->anyPolicy, NULL) == NULL)
++        if (level_add_node(curr, data, last->anyPolicy, tree, 0) == NULL)
+             return 0;
+     }
+     return 1;
+@@ -272,7 +288,8 @@ static int tree_link_matching_nodes(X509_POLICY_LEVEL *curr,
+  * Return value: 1 on success, 0 otherwise.
+  */
+ static int tree_link_nodes(X509_POLICY_LEVEL *curr,
+-                           const X509_POLICY_CACHE *cache)
++                           const X509_POLICY_CACHE *cache,
++                           X509_POLICY_TREE *tree)
+ {
+     int i;
+
+@@ -280,7 +297,7 @@ static int tree_link_nodes(X509_POLICY_LEVEL *curr,
+         X509_POLICY_DATA *data = sk_X509_POLICY_DATA_value(cache->data, i);
+
+         /* Look for matching nodes in previous level */
+-        if (!tree_link_matching_nodes(curr, data))
++        if (!tree_link_matching_nodes(curr, data, tree))
+             return 0;
+     }
+     return 1;
+@@ -311,7 +328,7 @@ static int tree_add_unmatched(X509_POLICY_LEVEL *curr,
+     /* Curr may not have anyPolicy */
+     data->qualifier_set = cache->anyPolicy->qualifier_set;
+     data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
+-    if (level_add_node(curr, data, node, tree) == NULL) {
++    if (level_add_node(curr, data, node, tree, 1) == NULL) {
+         policy_data_free(data);
+         return 0;
+     }
+@@ -373,7 +390,7 @@ static int tree_link_any(X509_POLICY_LEVEL *curr,
+     }
+     /* Finally add link to anyPolicy */
+     if (last->anyPolicy &&
+-        level_add_node(curr, cache->anyPolicy, last->anyPolicy, NULL) == NULL)
++        level_add_node(curr, cache->anyPolicy, last->anyPolicy, tree, 0) == NULL)
+         return 0;
+     return 1;
+ }
+@@ -555,7 +572,7 @@ static int tree_calculate_user_set(X509_POLICY_TREE *tree,
+             extra->qualifier_set = anyPolicy->data->qualifier_set;
+             extra->flags = POLICY_DATA_FLAG_SHARED_QUALIFIERS
+                 | POLICY_DATA_FLAG_EXTRA_NODE;
+-            node = level_add_node(NULL, extra, anyPolicy->parent, tree);
++            node = level_add_node(NULL, extra, anyPolicy->parent, tree, 1);
+         }
+         if (!tree->user_policies) {
+             tree->user_policies = sk_X509_POLICY_NODE_new_null();
+@@ -582,7 +599,7 @@ static int tree_evaluate(X509_POLICY_TREE *tree)
+
+     for (i = 1; i < tree->nlevel; i++, curr++) {
+         cache = policy_cache_set(curr->cert);
+-        if (!tree_link_nodes(curr, cache))
++        if (!tree_link_nodes(curr, cache, tree))
+             return X509_PCY_TREE_INTERNAL;
+
+         if (!(curr->flags & X509_V_FLAG_INHIBIT_ANY)
+--
+2.34.1

config/software/openssl.rb

@@ -67,6 +67,7 @@ build do
   command configure_command, env: env, in_msys_bash: true
   patch source: "openssl-1.1.1f-do-not-install-docs.patch", env: env
+  patch source: "openssl-1.1.1t-excessive-resource-use-verifying-policy-constraints.patch", env: env
   make 'depend', env: env
   # make -j N on openssl is not reliable