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| 1 | +From 09df4395b5071217b76dc7d3d2e630eb8c5a79c2 Mon Sep 17 00:00:00 2001 |
| 2 | +From: Matt Caswell <matt@openssl.org> |
| 3 | +Date: Fri, 19 Jan 2024 11:28:58 +0000 |
| 4 | +Subject: [PATCH] Add NULL checks where ContentInfo data can be NULL |
| 5 | + |
| 6 | +PKCS12 structures contain PKCS7 ContentInfo fields. These fields are |
| 7 | +optional and can be NULL even if the "type" is a valid value. OpenSSL |
| 8 | +was not properly accounting for this and a NULL dereference can occur |
| 9 | +causing a crash. |
| 10 | + |
| 11 | +CVE-2024-0727 |
| 12 | + |
| 13 | +Reviewed-by: Tomas Mraz <tomas@openssl.org> |
| 14 | +Reviewed-by: Hugo Landau <hlandau@openssl.org> |
| 15 | +Reviewed-by: Neil Horman <nhorman@openssl.org> |
| 16 | +(Merged from https://github.com/openssl/openssl/pull/23362) |
| 17 | + |
| 18 | +(cherry picked from commit d135eeab8a5dbf72b3da5240bab9ddb7678dbd2c) |
| 19 | +diff -wpruN --no-dereference '--exclude=*.orig' a~/crypto/pkcs12/p12_add.c a/crypto/pkcs12/p12_add.c |
| 20 | +--- a~/crypto/pkcs12/p12_add.c 1970-01-01 00:00:00 |
| 21 | ++++ a/crypto/pkcs12/p12_add.c 1970-01-01 00:00:00 |
| 22 | +@@ -171,6 +171,13 @@ STACK_OF(PKCS12_SAFEBAG) *PKCS12_unpack_ |
| 23 | + PKCS12_R_CONTENT_TYPE_NOT_DATA); |
| 24 | + return NULL; |
| 25 | + } |
| 26 | ++ |
| 27 | ++ if (p7->d.data == NULL) { |
| 28 | ++ PKCS12err(PKCS12_F_PKCS12_UNPACK_P7DATA, |
| 29 | ++ PKCS12_R_DECODE_ERROR); |
| 30 | ++ return NULL; |
| 31 | ++ } |
| 32 | ++ |
| 33 | + return ASN1_item_unpack(p7->d.data, ASN1_ITEM_rptr(PKCS12_SAFEBAGS)); |
| 34 | + } |
| 35 | + |
| 36 | +@@ -226,6 +233,13 @@ STACK_OF(PKCS12_SAFEBAG) *PKCS12_unpack_ |
| 37 | + { |
| 38 | + if (!PKCS7_type_is_encrypted(p7)) |
| 39 | + return NULL; |
| 40 | ++ |
| 41 | ++ if (p7->d.encrypted == NULL) { |
| 42 | ++ PKCS12err(PKCS12_F_PKCS12_UNPACK_P7DATA, |
| 43 | ++ PKCS12_R_DECODE_ERROR); |
| 44 | ++ return NULL; |
| 45 | ++ } |
| 46 | ++ |
| 47 | + return PKCS12_item_decrypt_d2i(p7->d.encrypted->enc_data->algorithm, |
| 48 | + ASN1_ITEM_rptr(PKCS12_SAFEBAGS), |
| 49 | + pass, passlen, |
| 50 | +@@ -253,6 +267,13 @@ STACK_OF(PKCS7) *PKCS12_unpack_authsafes |
| 51 | + PKCS12_R_CONTENT_TYPE_NOT_DATA); |
| 52 | + return NULL; |
| 53 | + } |
| 54 | ++ |
| 55 | ++ if (p12->authsafes->d.data == NULL) { |
| 56 | ++ PKCS12err(PKCS12_F_PKCS12_UNPACK_AUTHSAFES, |
| 57 | ++ PKCS12_R_DECODE_ERROR); |
| 58 | ++ return NULL; |
| 59 | ++ } |
| 60 | ++ |
| 61 | + return ASN1_item_unpack(p12->authsafes->d.data, |
| 62 | + ASN1_ITEM_rptr(PKCS12_AUTHSAFES)); |
| 63 | + } |
| 64 | +diff -wpruN --no-dereference '--exclude=*.orig' a~/crypto/pkcs12/p12_mutl.c a/crypto/pkcs12/p12_mutl.c |
| 65 | +--- a~/crypto/pkcs12/p12_mutl.c 1970-01-01 00:00:00 |
| 66 | ++++ a/crypto/pkcs12/p12_mutl.c 1970-01-01 00:00:00 |
| 67 | +@@ -80,6 +80,11 @@ int PKCS12_gen_mac(PKCS12 *p12, const ch |
| 68 | + return 0; |
| 69 | + } |
| 70 | + |
| 71 | ++ if (p12->authsafes->d.data == NULL) { |
| 72 | ++ PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_DECODE_ERROR); |
| 73 | ++ return 0; |
| 74 | ++ } |
| 75 | ++ |
| 76 | + salt = p12->mac->salt->data; |
| 77 | + saltlen = p12->mac->salt->length; |
| 78 | + if (!p12->mac->iter) |
| 79 | +diff -wpruN --no-dereference '--exclude=*.orig' a~/crypto/pkcs12/p12_npas.c a/crypto/pkcs12/p12_npas.c |
| 80 | +--- a~/crypto/pkcs12/p12_npas.c 1970-01-01 00:00:00 |
| 81 | ++++ a/crypto/pkcs12/p12_npas.c 1970-01-01 00:00:00 |
| 82 | +@@ -126,7 +126,8 @@ static int newpass_p12(PKCS12 *p12, cons |
| 83 | + bags = PKCS12_unpack_p7data(p7); |
| 84 | + } else if (bagnid == NID_pkcs7_encrypted) { |
| 85 | + bags = PKCS12_unpack_p7encdata(p7, oldpass, -1); |
| 86 | +- if (!alg_get(p7->d.encrypted->enc_data->algorithm, |
| 87 | ++ if (p7->d.encrypted == NULL |
| 88 | ++ || !alg_get(p7->d.encrypted->enc_data->algorithm, |
| 89 | + &pbe_nid, &pbe_iter, &pbe_saltlen)) |
| 90 | + goto err; |
| 91 | + } else { |
| 92 | +diff -wpruN --no-dereference '--exclude=*.orig' a~/crypto/pkcs7/pk7_mime.c a/crypto/pkcs7/pk7_mime.c |
| 93 | +--- a~/crypto/pkcs7/pk7_mime.c 1970-01-01 00:00:00 |
| 94 | ++++ a/crypto/pkcs7/pk7_mime.c 1970-01-01 00:00:00 |
| 95 | +@@ -78,10 +78,13 @@ int SMIME_write_PKCS7(BIO *bio, PKCS7 *p |
| 96 | + { |
| 97 | + STACK_OF(X509_ALGOR) *mdalgs; |
| 98 | + int ctype_nid = OBJ_obj2nid(p7->type); |
| 99 | +- if (ctype_nid == NID_pkcs7_signed) |
| 100 | ++ if (ctype_nid == NID_pkcs7_signed) { |
| 101 | ++ if (p7->d.sign == NULL) |
| 102 | ++ return 0; |
| 103 | + mdalgs = p7->d.sign->md_algs; |
| 104 | +- else |
| 105 | ++ } else { |
| 106 | + mdalgs = NULL; |
| 107 | ++ } |
| 108 | + |
| 109 | + flags ^= SMIME_OLDMIME; |
| 110 | + |
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