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SUSE:SLE-12-SP4:GA
openssl.6976
openssl-CVE-2018-0739.patch
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File openssl-CVE-2018-0739.patch of Package openssl.6976
commit 9310d45087ae546e27e61ddf8f6367f29848220d Author: Matt Caswell <matt@openssl.org> Date: Thu Mar 22 10:05:40 2018 +0000 Limit ASN.1 constructed types recursive definition depth Constructed types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. Therefore we limit the stack depth. CVE-2018-0739 Credit to OSSFuzz for finding this issue. Reviewed-by: Rich Salz <rsalz@openssl.org> Index: openssl-1.0.2j/crypto/asn1/asn1.h =================================================================== --- openssl-1.0.2j.orig/crypto/asn1/asn1.h 2016-09-26 11:49:07.000000000 +0200 +++ openssl-1.0.2j/crypto/asn1/asn1.h 2018-03-27 17:45:45.338719852 +0200 @@ -1365,6 +1365,7 @@ void ERR_load_ASN1_strings(void); # define ASN1_R_MSTRING_NOT_UNIVERSAL 139 # define ASN1_R_MSTRING_WRONG_TAG 140 # define ASN1_R_NESTED_ASN1_STRING 197 +# define ASN1_R_NESTED_TOO_DEEP 219 # define ASN1_R_NON_HEX_CHARACTERS 141 # define ASN1_R_NOT_ASCII_FORMAT 190 # define ASN1_R_NOT_ENOUGH_DATA 142 Index: openssl-1.0.2j/crypto/asn1/asn1_err.c =================================================================== --- openssl-1.0.2j.orig/crypto/asn1/asn1_err.c 2016-09-26 11:49:07.000000000 +0200 +++ openssl-1.0.2j/crypto/asn1/asn1_err.c 2018-03-27 17:45:45.338719852 +0200 @@ -1,6 +1,6 @@ /* crypto/asn1/asn1_err.c */ /* ==================================================================== - * Copyright (c) 1999-2014 The OpenSSL Project. All rights reserved. + * Copyright (c) 1999-2018 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -279,6 +279,7 @@ static ERR_STRING_DATA ASN1_str_reasons[ {ERR_REASON(ASN1_R_MSTRING_NOT_UNIVERSAL), "mstring not universal"}, {ERR_REASON(ASN1_R_MSTRING_WRONG_TAG), "mstring wrong tag"}, {ERR_REASON(ASN1_R_NESTED_ASN1_STRING), "nested asn1 string"}, + {ERR_REASON(ASN1_R_NESTED_TOO_DEEP), "nested too deep"}, {ERR_REASON(ASN1_R_NON_HEX_CHARACTERS), "non hex characters"}, {ERR_REASON(ASN1_R_NOT_ASCII_FORMAT), "not ascii format"}, {ERR_REASON(ASN1_R_NOT_ENOUGH_DATA), "not enough data"}, Index: openssl-1.0.2j/crypto/asn1/tasn_dec.c =================================================================== --- openssl-1.0.2j.orig/crypto/asn1/tasn_dec.c 2016-09-26 11:49:07.000000000 +0200 +++ openssl-1.0.2j/crypto/asn1/tasn_dec.c 2018-03-27 17:45:45.338719852 +0200 @@ -65,6 +65,14 @@ #include <openssl/buffer.h> #include <openssl/err.h> +/* + * Constructed types with a recursive definition (such as can be found in PKCS7) + * could eventually exceed the stack given malicious input with excessive + * recursion. Therefore we limit the stack depth. This is the maximum number of + * recursive invocations of asn1_item_embed_d2i(). + */ +#define ASN1_MAX_CONSTRUCTED_NEST 30 + static int asn1_check_eoc(const unsigned char **in, long len); static int asn1_find_end(const unsigned char **in, long len, char inf); @@ -81,11 +89,11 @@ static int asn1_check_tlen(long *olen, i static int asn1_template_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx); + ASN1_TLC *ctx, int depth); static int asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx); + ASN1_TLC *ctx, int depth); static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it, @@ -154,17 +162,16 @@ int ASN1_template_d2i(ASN1_VALUE **pval, { ASN1_TLC c; asn1_tlc_clear_nc(&c); - return asn1_template_ex_d2i(pval, in, len, tt, 0, &c); + return asn1_template_ex_d2i(pval, in, len, tt, 0, &c, 0); } /* * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and * tag mismatch return -1 to handle OPTIONAL */ - -int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, - const ASN1_ITEM *it, - int tag, int aclass, char opt, ASN1_TLC *ctx) +static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, + long len, const ASN1_ITEM *it, int tag, int aclass, + char opt, ASN1_TLC *ctx, int depth) { const ASN1_TEMPLATE *tt, *errtt = NULL; const ASN1_COMPAT_FUNCS *cf; @@ -189,6 +196,11 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, else asn1_cb = 0; + if (++depth > ASN1_MAX_CONSTRUCTED_NEST) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NESTED_TOO_DEEP); + goto err; + } + switch (it->itype) { case ASN1_ITYPE_PRIMITIVE: if (it->templates) { @@ -204,7 +216,7 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, goto err; } return asn1_template_ex_d2i(pval, in, len, - it->templates, opt, ctx); + it->templates, opt, ctx, depth); } return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx); @@ -326,7 +338,7 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, /* * We mark field as OPTIONAL so its absence can be recognised. */ - ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx); + ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx, depth); /* If field not present, try the next one */ if (ret == -1) continue; @@ -444,7 +456,8 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, * attempt to read in field, allowing each to be OPTIONAL */ - ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx); + ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx, + depth); if (!ret) { errtt = seqtt; goto err; @@ -514,6 +527,13 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, return 0; } +int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, + const ASN1_ITEM *it, + int tag, int aclass, char opt, ASN1_TLC *ctx) +{ + return asn1_item_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx, 0); +} + /* * Templates are handled with two separate functions. One handles any * EXPLICIT tag and the other handles the rest. @@ -522,7 +542,7 @@ int ASN1_item_ex_d2i(ASN1_VALUE **pval, static int asn1_template_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx) + ASN1_TLC *ctx, int depth) { int flags, aclass; int ret; @@ -557,7 +577,7 @@ static int asn1_template_ex_d2i(ASN1_VAL return 0; } /* We've found the field so it can't be OPTIONAL now */ - ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx); + ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx, depth); if (!ret) { ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR); return 0; @@ -581,7 +601,7 @@ static int asn1_template_ex_d2i(ASN1_VAL } } } else - return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx); + return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx, depth); *in = p; return 1; @@ -594,7 +614,7 @@ static int asn1_template_ex_d2i(ASN1_VAL static int asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx) + ASN1_TLC *ctx, int depth) { int flags, aclass; int ret; @@ -665,8 +685,8 @@ static int asn1_template_noexp_d2i(ASN1_ break; } skfield = NULL; - if (!ASN1_item_ex_d2i(&skfield, &p, len, - ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) { + if (!asn1_item_ex_d2i(&skfield, &p, len, ASN1_ITEM_ptr(tt->item), + -1, 0, 0, ctx, depth)) { ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); goto err; @@ -683,9 +703,8 @@ static int asn1_template_noexp_d2i(ASN1_ } } else if (flags & ASN1_TFLG_IMPTAG) { /* IMPLICIT tagging */ - ret = ASN1_item_ex_d2i(val, &p, len, - ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, - ctx); + ret = asn1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), tt->tag, + aclass, opt, ctx, depth); if (!ret) { ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); goto err; @@ -693,8 +712,9 @@ static int asn1_template_noexp_d2i(ASN1_ return -1; } else { /* Nothing special */ - ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), - -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx); + ret = asn1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), + -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx, + depth); if (!ret) { ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); goto err;
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