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libs/c-ares: fix domain hijacking CVE-2021-3672 

Missing input validation of host names returned by Domain Name Servers
in the c-ares library can lead to output of wrong hostnames (leading to
Domain Hijacking).

I've just taken patch from the advisory[1] and rebased it onto 1.15.0
version.

1. 809d5e8..44c009b.patch

Fixes: CVE-2021-3672
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Petr Štetiar 2021-12-02 13:54:42 +01:00
parent 45218f2059
commit e93fc5a20f
3 changed files with 202 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libs/c-ares/Makefile
View File

@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=c-ares
PKG_VERSION:=1.15.0
PKG_RELEASE:=4
PKG_RELEASE:=5
PKG_LICENSE:=MIT
PKG_CPE_ID:=cpe:/a:c-ares_project:c-ares

88
libs/c-ares/patches/0001-ares_expand_name-should-escape-more-characters.patch Normal file
View File

@ -0,0 +1,88 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: bradh352 <brad@brad-house.com>
Date: Fri, 11 Jun 2021 11:27:45 -0400
Subject: [PATCH] ares_expand_name() should escape more characters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RFC1035 5.1 specifies some reserved characters and escaping sequences
that are allowed to be specified. Expand the list of reserved characters
and also escape non-printable characters using the \DDD format as
specified in the RFC.
Bug Reported By: philipp.jeitner@sit.fraunhofer.de
Fix By: Brad House (@bradh352)
[rebased onto 1.15.0]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
---
ares_expand_name.c | 41 ++++++++++++++++++++++++++++++++++++++---
1 file changed, 38 insertions(+), 3 deletions(-)
diff --git a/ares_expand_name.c b/ares_expand_name.c
index 3a38e6737e93..8604543fc39d 100644
--- a/ares_expand_name.c
+++ b/ares_expand_name.c
@@ -38,6 +38,26 @@
static int name_length(const unsigned char *encoded, const unsigned char *abuf,
int alen);
+/* Reserved characters for names that need to be escaped */
+static int is_reservedch(int ch)
+{
+ switch (ch) {
+ case '"':
+ case '.':
+ case ';':
+ case '\\':
+ case '(':
+ case ')':
+ case '@':
+ case '$':
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
/* Expand an RFC1035-encoded domain name given by encoded. The
* containing message is given by abuf and alen. The result given by
* *s, which is set to a NUL-terminated allocated buffer. *enclen is
@@ -117,9 +137,18 @@ int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
p++;
while (len--)
{
- if (*p == '.' || *p == '\\')
+ if (!isprint(*p)) {
+ /* Output as \DDD for consistency with RFC1035 5.1 */
+ *q++ = '\\';
+ *q++ = '0' + *p / 100;
+ *q++ = '0' + (*p % 100) / 10;
+ *q++ = '0' + (*p % 10);
+ } else if (is_reservedch(*p)) {
*q++ = '\\';
- *q++ = *p;
+ *q++ = *p;
+ } else {
+ *q++ = *p;
+ }
p++;
}
*q++ = '.';
@@ -177,7 +206,13 @@ static int name_length(const unsigned char *encoded, const unsigned char *abuf,
encoded++;
while (offset--)
{
- n += (*encoded == '.' || *encoded == '\\') ? 2 : 1;
+ if (!isprint(*encoded)) {
+ n += 4;
+ } else if (is_reservedch(*encoded)) {
+ n += 2;
+ } else {
+ n += 1;
+ }
encoded++;
}
n++;

113
libs/c-ares/patches/0002-ares_expand_name-fix-formatting-and-handling-of-root.patch Normal file
View File

@ -0,0 +1,113 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: bradh352 <brad@brad-house.com>
Date: Fri, 11 Jun 2021 12:39:24 -0400
Subject: [PATCH] ares_expand_name(): fix formatting and handling of root name
response
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fixes issue introduced in prior commit with formatting and handling
of parsing a root name response which should not be escaped.
Fix By: Brad House
[rebased onto 1.15.0]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
---
ares_expand_name.c | 62 ++++++++++++++++++++++++++++++----------------
1 file changed, 40 insertions(+), 22 deletions(-)
diff --git a/ares_expand_name.c b/ares_expand_name.c
index 8604543fc39d..f89ee3f7a602 100644
--- a/ares_expand_name.c
+++ b/ares_expand_name.c
@@ -133,27 +133,37 @@ int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
}
else
{
- len = *p;
+ int name_len = *p;
+ len = name_len;
p++;
+
while (len--)
{
- if (!isprint(*p)) {
- /* Output as \DDD for consistency with RFC1035 5.1 */
- *q++ = '\\';
- *q++ = '0' + *p / 100;
- *q++ = '0' + (*p % 100) / 10;
- *q++ = '0' + (*p % 10);
- } else if (is_reservedch(*p)) {
- *q++ = '\\';
- *q++ = *p;
- } else {
- *q++ = *p;
- }
+ /* Output as \DDD for consistency with RFC1035 5.1, except
+ * for the special case of a root name response */
+ if (!isprint(*p) && !(name_len == 1 && *p == 0))
+ {
+
+ *q++ = '\\';
+ *q++ = '0' + *p / 100;
+ *q++ = '0' + (*p % 100) / 10;
+ *q++ = '0' + (*p % 10);
+ }
+ else if (is_reservedch(*p))
+ {
+ *q++ = '\\';
+ *q++ = *p;
+ }
+ else
+ {
+ *q++ = *p;
+ }
p++;
}
*q++ = '.';
}
- }
+ }
+
if (!indir)
*enclen = aresx_uztosl(p + 1U - encoded);
@@ -200,21 +210,29 @@ static int name_length(const unsigned char *encoded, const unsigned char *abuf,
}
else if (top == 0x00)
{
- offset = *encoded;
+ int name_len = *encoded;
+ offset = name_len;
if (encoded + offset + 1 >= abuf + alen)
return -1;
encoded++;
+
while (offset--)
{
- if (!isprint(*encoded)) {
- n += 4;
- } else if (is_reservedch(*encoded)) {
- n += 2;
- } else {
- n += 1;
- }
+ if (!isprint(*encoded) && !(name_len == 1 && *encoded == 0))
+ {
+ n += 4;
+ }
+ else if (is_reservedch(*encoded))
+ {
+ n += 2;
+ }
+ else
+ {
+ n += 1;
+ }
encoded++;
}
+
n++;
}
else