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import c-ares-1.13.0-6.el8

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CentOS Sources 2021-11-21 04:20:12 +00:00 committed by Stepan Oksanichenko
parent 92b6e300fa
commit d1b7962fa4
2 changed files with 204 additions and 1 deletions
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198
SOURCES/0002-fix-CVE-2021-3672.patch Normal file
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@ -0,0 +1,198 @@
From 4bde615c5fa2a6a6f61ca533e46a062691d83f45 Mon Sep 17 00:00:00 2001
From: bradh352 <brad@brad-house.com>
Date: Fri, 11 Jun 2021 11:27:45 -0400
Subject: [PATCH 1/2] ares_expand_name() should escape more characters
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)
---
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 3a38e67..8604543 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++;
--
2.26.3
From 86cc9241f89c1155111b992ccc03bf76d8ae634a Mon Sep 17 00:00:00 2001
From: bradh352 <brad@brad-house.com>
Date: Fri, 11 Jun 2021 12:39:24 -0400
Subject: [PATCH 2/2] ares_expand_name(): fix formatting and handling of root
name response
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
---
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 8604543..f89ee3f 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
--
2.26.3

7
SPECS/c-ares.spec
View File

@ -1,7 +1,7 @@
Summary: A library that performs asynchronous DNS operations
Name: c-ares
Version: 1.13.0
Release: 5%{?dist}
Release: 6%{?dist}
License: MIT
Group: System Environment/Libraries
URL: http://c-ares.haxx.se/
@ -9,6 +9,7 @@ Source0: http://c-ares.haxx.se/download/%{name}-%{version}.tar.gz
# The license can be obtained at http://c-ares.haxx.se/license.html
Source1: LICENSE
Patch0: 0001-Use-RPM-compiler-options.patch
Patch1: 0002-fix-CVE-2021-3672.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@ -34,6 +35,7 @@ compile applications or shared objects that use c-ares.
%prep
%setup -q
%patch0 -p1 -b .optflags
%patch1 -p1 -b .dns
cp %{SOURCE1} .
f=CHANGES ; iconv -f iso-8859-1 -t utf-8 $f -o $f.utf8 ; mv $f.utf8 $f
@ -72,6 +74,9 @@ rm -rf $RPM_BUILD_ROOT
%{_mandir}/man3/ares_*
%changelog
* Fri Oct 15 2021 Alexey Tikhonov <atikhono@redhat.com> - 1.13.0-6
- Resolves: rhbz#1989425 - CVE-2021-3672 c-ares: missing input validation of host names may lead to Domain Hijacking [rhel-8]
* Mon Aug 13 2018 Jakub Hrozek <jhrozek@redhat.com> - 1.13.0-5
- Drop an unused patch