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Fix CVE-2014-2905 and CVE-2014-2906

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epel9
Andy Lutomirski 11 years ago
parent 85febc7ff7
commit 8e15cc337d
3 changed files with 345 additions and 1 deletions
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266
fish-upstream-CVE-2014-2905.patch
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@ -0,0 +1,266 @@
From 8412c867a501e3a68e55fef6215e86d3ac9f617b Mon Sep 17 00:00:00 2001
Message-Id: <8412c867a501e3a68e55fef6215e86d3ac9f617b.1398703637.git.luto@amacapital.net>
In-Reply-To: <3c5d5b344ee945b99e4bb16a44af6f293601813d.1398703637.git.luto@amacapital.net>
References: <3c5d5b344ee945b99e4bb16a44af6f293601813d.1398703637.git.luto@amacapital.net>
From: David Adam <zanchey@ucc.gu.uwa.edu.au>
Date: Sun, 20 Apr 2014 17:51:27 +0800
Subject: [PATCH 3/4] Check effective credentials of socket peers
Fix for CVE-2014-2905.
Code for getpeereid() on non-BSD systems imported from the PostgreSQL
project under a BSD-style license.
---
configure.ac | 4 +--
doc_src/license.hdr | 30 +++++++++++++++++++-
env_universal.cpp | 9 ++++++
fallback.cpp | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
fallback.h | 4 +++
fishd.cpp | 9 +++++-
osx/config.h | 6 ++++
7 files changed, 137 insertions(+), 5 deletions(-)
diff --git a/configure.ac b/configure.ac
index ea7c592..bdfa5f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -557,7 +557,7 @@ LIBS=$LIBS_COMMON
# Check presense of various header files
#
-AC_CHECK_HEADERS([getopt.h termios.h sys/resource.h term.h ncurses/term.h ncurses.h curses.h stropts.h siginfo.h sys/select.h sys/ioctl.h execinfo.h spawn.h sys/sysctl.h])
+AC_CHECK_HEADERS([getopt.h termios.h sys/resource.h term.h ncurses/term.h ncurses.h curses.h stropts.h siginfo.h sys/select.h sys/ioctl.h execinfo.h spawn.h sys/sysctl.h sys/un.h sys/ucred.h ucred.h ])
if test x$local_gettext != xno; then
AC_CHECK_HEADERS([libintl.h])
@@ -698,7 +698,7 @@ fi
AC_CHECK_FUNCS( wcsdup wcsndup wcslen wcscasecmp wcsncasecmp fwprintf )
AC_CHECK_FUNCS( futimes wcwidth wcswidth wcstok fputwc fgetwc )
AC_CHECK_FUNCS( wcstol wcslcat wcslcpy lrand48_r killpg )
-AC_CHECK_FUNCS( backtrace backtrace_symbols sysconf getifaddrs )
+AC_CHECK_FUNCS( backtrace backtrace_symbols sysconf getifaddrs getpeerucred getpeereid )
if test x$local_gettext != xno; then
AC_CHECK_FUNCS( gettext dcgettext )
diff --git a/doc_src/license.hdr b/doc_src/license.hdr
index 64bab10..f292722 100644
--- a/doc_src/license.hdr
+++ b/doc_src/license.hdr
@@ -1400,6 +1400,34 @@ POSSIBILITY OF SUCH DAMAGES.
<P>
-*/
+<hr>
+
+<h2>License for getpeereid</h2>
+
+\c fish contains code imported from the PostgreSQL project under
+license, namely the getpeereid fallback function. This code is copyrighted
+by:
+
+Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+
+Portions Copyright (c) 1994, The Regents of the University of California
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose, without fee, and without a written agreement
+is hereby granted, provided that the above copyright notice and this
+paragraph and the following two paragraphs appear in all copies.
+
+IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
+LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
+PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
\htmlonly </div> \endhtmlonly
+*/
diff --git a/env_universal.cpp b/env_universal.cpp
index c7d060a..987f88b 100644
--- a/env_universal.cpp
+++ b/env_universal.cpp
@@ -88,6 +88,8 @@ static int try_get_socket_once(void)
wdir = path;
wuname = user;
+ uid_t seuid;
+ gid_t segid;
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
{
@@ -135,6 +137,13 @@ static int try_get_socket_once(void)
return -1;
}
+ if ((getpeereid(s, &seuid, &segid) != 0) || seuid != geteuid())
+ {
+ debug(1, L"Wrong credentials for socket %s at fd %d", name.c_str(), s);
+ close(s);
+ return -1;
+ }
+
if ((make_fd_nonblocking(s) != 0) || (fcntl(s, F_SETFD, FD_CLOEXEC) != 0))
{
wperror(L"fcntl");
diff --git a/fallback.cpp b/fallback.cpp
index 5e4b3e1..34db397 100644
--- a/fallback.cpp
+++ b/fallback.cpp
@@ -15,8 +15,9 @@
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
+#include <sys/socket.h>
#include <sys/stat.h>
-#include <unistd.h>
+#include <sys/param.h>
#include <errno.h>
#include <fcntl.h>
#include <wchar.h>
@@ -1521,3 +1522,80 @@ static int mk_wcswidth(const wchar_t *pwcs, size_t n)
}
#endif // HAVE_BROKEN_WCWIDTH
+
+#ifndef HAVE_GETPEEREID
+
+/*-------------------------------------------------------------------------
+ *
+ * getpeereid.c
+ * get peer userid for UNIX-domain socket connection
+ *
+ * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ * src/port/getpeereid.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#ifdef HAVE_UCRED_H
+#include <ucred.h>
+#endif
+#ifdef HAVE_SYS_UCRED_H
+#include <sys/ucred.h>
+#endif
+
+/*
+ * BSD-style getpeereid() for platforms that lack it.
+ */
+int getpeereid(int sock, uid_t *uid, gid_t *gid)
+{
+#if defined(SO_PEERCRED)
+ /* Linux: use getsockopt(SO_PEERCRED) */
+ struct ucred peercred;
+ socklen_t so_len = sizeof(peercred);
+
+ if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) != 0 ||
+ so_len != sizeof(peercred))
+ return -1;
+ *uid = peercred.uid;
+ *gid = peercred.gid;
+ return 0;
+#elif defined(LOCAL_PEERCRED)
+ /* Debian with FreeBSD kernel: use getsockopt(LOCAL_PEERCRED) */
+ struct xucred peercred;
+ socklen_t * so_len = sizeof(peercred);
+
+ if (getsockopt(sock, 0, LOCAL_PEERCRED, &peercred, &so_len) != 0 ||
+ so_len != sizeof(peercred) ||
+ peercred.cr_version != XUCRED_VERSION)
+ return -1;
+ *uid = peercred.cr_uid;
+ *gid = peercred.cr_gid;
+ return 0;
+#elif defined(HAVE_GETPEERUCRED)
+ /* Solaris: use getpeerucred() */
+ ucred_t *ucred;
+
+ ucred = NULL; /* must be initialized to NULL */
+ if (getpeerucred(sock, &ucred) == -1)
+ return -1;
+
+ *uid = ucred_geteuid(ucred);
+ *gid = ucred_getegid(ucred);
+ ucred_free(ucred);
+
+ if (*uid == (uid_t) (-1) || *gid == (gid_t) (-1))
+ return -1;
+ return 0;
+#else
+ /* No implementation available on this platform */
+ errno = ENOSYS;
+ return -1;
+#endif
+}
+#endif // HAVE_GETPEEREID
diff --git a/fallback.h b/fallback.h
index eba91be..6898ea5 100644
--- a/fallback.h
+++ b/fallback.h
@@ -482,3 +482,7 @@ double nan(char *tagp);
#endif
+
+#ifndef HAVE_GETPEEREID
+int getpeereid(int sock, uid_t *uid, gid_t *gid);
+#endif
diff --git a/fishd.cpp b/fishd.cpp
index edb79c2..1e09524 100644
--- a/fishd.cpp
+++ b/fishd.cpp
@@ -880,6 +880,8 @@ int main(int argc, char ** argv)
int child_socket;
struct sockaddr_un remote;
socklen_t t;
+ uid_t sock_euid;
+ gid_t sock_egid;
int max_fd;
int update_count=0;
@@ -1000,7 +1002,12 @@ int main(int argc, char ** argv)
{
debug(4, L"Connected with new child on fd %d", child_socket);
- if (make_fd_nonblocking(child_socket) != 0)
+ if (((getpeereid(child_socket, &sock_euid, &sock_egid) != 0) || sock_euid != geteuid()))
+ {
+ debug(1, L"Wrong credentials for child on fd %d", child_socket);
+ close(child_socket);
+ }
+ else if (make_fd_nonblocking(child_socket) != 0)
{
wperror(L"fcntl");
close(child_socket);
diff --git a/osx/config.h b/osx/config.h
index 4968a78..bc058ae 100644
--- a/osx/config.h
+++ b/osx/config.h
@@ -40,6 +40,12 @@
/* Define to 1 if you have the <getopt.h> header file. */
#define HAVE_GETOPT_H 1
+/* Define to 1 if you have the `getpeereid' function. */
+#define HAVE_GETPEEREID 1
+
+/* Define to 1 if you have the `getpeerucred' function. */
+/* #undef HAVE_GETPEERUCRED */
+
/* Define to 1 if you have the `gettext' function. */
/* #undef HAVE_GETTEXT */
--
1.9.0

70
fish-upstream-CVE-2014-2906.patch
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From c0989dce2d882c94eb3183e7b94402ba53534abb Mon Sep 17 00:00:00 2001
Message-Id: <c0989dce2d882c94eb3183e7b94402ba53534abb.1398703637.git.luto@amacapital.net>
In-Reply-To: <3c5d5b344ee945b99e4bb16a44af6f293601813d.1398703637.git.luto@amacapital.net>
References: <3c5d5b344ee945b99e4bb16a44af6f293601813d.1398703637.git.luto@amacapital.net>
From: David Adam <zanchey@ucc.gu.uwa.edu.au>
Date: Sun, 20 Apr 2014 23:51:20 +0800
Subject: [PATCH 4/4] use mktemp(1) to generate temporary file names
Fix for CVE-2014-2906.
Closes a race condition in funced which would allow execution of
arbitrary code; closes a race condition in psub which would allow
alternation of the data stream.
Note that `psub -f` does not work (#1040); a fix should be committed
separately for ease of maintenance.
---
share/functions/funced.fish | 6 +-----
share/functions/psub.fish | 11 +++--------
2 files changed, 4 insertions(+), 13 deletions(-)
diff --git a/share/functions/funced.fish b/share/functions/funced.fish
index 3c2de06..ca2e277 100644
--- a/share/functions/funced.fish
+++ b/share/functions/funced.fish
@@ -81,11 +81,7 @@ function funced --description 'Edit function definition'
return 0
end
- set -q TMPDIR; or set -l TMPDIR /tmp
- set -l tmpname (printf "$TMPDIR/fish_funced_%d_%d.fish" %self (random))
- while test -f $tmpname
- set tmpname (printf "$TMPDIR/fish_funced_%d_%d.fish" %self (random))
- end
+ set tmpname (mktemp -t fish_funced.XXXXXXXXXX)
if functions -q -- $funcname
functions -- $funcname > $tmpname
diff --git a/share/functions/psub.fish b/share/functions/psub.fish
index 42e34c7..7877aa4 100644
--- a/share/functions/psub.fish
+++ b/share/functions/psub.fish
@@ -45,21 +45,16 @@ function psub --description "Read from stdin into a file and output the filename
return
end
- # Find unique file name for writing output to
- while true
- set filename /tmp/.psub.(echo %self).(random);
- if not test -e $filename
- break;
- end
- end
-
if test use_fifo = 1
# Write output to pipe. This needs to be done in the background so
# that the command substitution exits without needing to wait for
# all the commands to exit
+ set dir (mktemp -d /tmp/.psub.XXXXXXXXXX); or return
+ set filename $dir/psub.fifo
mkfifo $filename
cat >$filename &
else
+ set filename (mktemp /tmp/.psub.XXXXXXXXXX)
cat >$filename
end
--
1.9.0

10
fish.spec
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@ -1,6 +1,6 @@
Name: fish
Version: 2.1.0
Release: 6%{?dist}
Release: 7%{?dist}
Summary: A friendly interactive shell
Group: System Environment/Shells
@ -10,6 +10,8 @@ Source0: http://fishshell.com/files/%{version}/fish-%{version}.ta
Patch0: fish-remove-usr-local.patch
Patch1: fish-add-link-cxxflags.patch
Patch2: fish-use-usrbinpython.patch
Patch3: fish-upstream-CVE-2014-2905.patch
Patch4: fish-upstream-CVE-2014-2906.patch
BuildRequires: ncurses-devel gettext groff doxygen
@ -25,6 +27,8 @@ nothing to learn or configure.
%patch0 -p1
%patch1 -p1
%patch2 -p1
%patch3 -p1
%patch4 -p1
# This is unused. If we fiddle with Python versions, its presence will
# be confusing.
@ -77,6 +81,10 @@ fi
%changelog
* Mon Apr 28 2014 Andy Lutomirski <luto@mit.edu> - 2.1.0-7
- Fix CVE-2014-2905
- Fix CVE-2014-2906
* Fri Dec 20 2013 Andy Lutomirski <luto@mit.edu> - 2.1.0-6
- Switch back to Python 2

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