Fix CVE-2017-10790: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10790 Patch copied from upstream source repository: https://git.savannah.nongnu.org/cgit/libtasn1.git/commit/?id=d8d805e1f2e6799bb2dff4871a8598dc83088a39 From d8d805e1f2e6799bb2dff4871a8598dc83088a39 Mon Sep 17 00:00:00 2001 From: Nikos Mavrogiannopoulos Date: Thu, 22 Jun 2017 16:31:37 +0200 Subject: [PATCH] _asn1_check_identifier: safer access to values read Signed-off-by: Nikos Mavrogiannopoulos --- lib/parser_aux.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/lib/parser_aux.c b/lib/parser_aux.c index 976ab38..786ea64 100644 --- a/lib/parser_aux.c +++ b/lib/parser_aux.c @@ -955,7 +955,7 @@ _asn1_check_identifier (asn1_node node) if (p2 == NULL) { if (p->value) - _asn1_strcpy (_asn1_identifierMissing, p->value); + _asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p->value); else _asn1_strcpy (_asn1_identifierMissing, "(null)"); return ASN1_IDENTIFIER_NOT_FOUND; @@ -968,9 +968,15 @@ _asn1_check_identifier (asn1_node node) if (p2 && (type_field (p2->type) == ASN1_ETYPE_DEFAULT)) { _asn1_str_cpy (name2, sizeof (name2), node->name); - _asn1_str_cat (name2, sizeof (name2), "."); - _asn1_str_cat (name2, sizeof (name2), (char *) p2->value); - _asn1_strcpy (_asn1_identifierMissing, p2->value); + if (p2->value) + { + _asn1_str_cat (name2, sizeof (name2), "."); + _asn1_str_cat (name2, sizeof (name2), (char *) p2->value); + _asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p2->value); + } + else + _asn1_strcpy (_asn1_identifierMissing, "(null)"); + p2 = asn1_find_node (node, name2); if (!p2 || (type_field (p2->type) != ASN1_ETYPE_OBJECT_ID) || !(p2->type & CONST_ASSIGN)) @@ -990,7 +996,8 @@ _asn1_check_identifier (asn1_node node) _asn1_str_cpy (name2, sizeof (name2), node->name); _asn1_str_cat (name2, sizeof (name2), "."); _asn1_str_cat (name2, sizeof (name2), (char *) p2->value); - _asn1_strcpy (_asn1_identifierMissing, p2->value); + _asn1_str_cpy (_asn1_identifierMissing, sizeof(_asn1_identifierMissing), (char*)p2->value); + p2 = asn1_find_node (node, name2); if (!p2 || (type_field (p2->type) != ASN1_ETYPE_OBJECT_ID) || !(p2->type & CONST_ASSIGN)) -- 2.13.3