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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 <nmav@redhat.com>
Date: Thu, 22 Jun 2017 16:31:37 +0200
Subject: [PATCH] _asn1_check_identifier: safer access to values read
Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
---
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
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