svn commit: r47456 - in head/share: security/advisories security/patches/SA-15:24 xml
Xin LI <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: delphij
Date: Tue Sep 29 18:14:20 2015
New Revision: 47456
URL: https://svnweb.freebsd.org/changeset/doc/47456
Log:
Add SA-15:24.rpcbind.
Added:
head/share/security/advisories/FreeBSD-SA-15:24.rpcbind.asc (contents, props changed)
head/share/security/patches/SA-15:24/
head/share/security/patches/SA-15:24/rpcbind.patch (contents, props changed)
head/share/security/patches/SA-15:24/rpcbind.patch.asc (contents, props changed)
Modified:
head/share/xml/advisories.xml
Added: head/share/security/advisories/FreeBSD-SA-15:24.rpcbind.asc
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/advisories/FreeBSD-SA-15:24.rpcbind.asc Tue Sep 29 18:14:20 2015 (r47456)
@@ -0,0 +1,155 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+=============================================================================
+FreeBSD-SA-15:24.rpcbind Security Advisory
+ The FreeBSD Project
+
+Topic: rpcbind(8) remote denial of service
+
+Category: core
+Module: rpcbind
+Announced: 2015-09-29
+Affects: All supported versions of FreeBSD.
+Corrected: 2015-09-29 18:06:27 UTC (stable/10, 10.2-STABLE)
+ 2015-09-29 18:07:18 UTC (releng/10.2, 10.2-RELEASE-p4)
+ 2015-09-29 18:07:18 UTC (releng/10.1, 10.1-RELEASE-p21)
+ 2015-09-29 18:06:27 UTC (stable/9, 9.3-STABLE)
+ 2015-09-29 18:07:18 UTC (releng/9.3, 9.3-RELEASE-p27)
+CVE Name: CVE-2015-7236
+
+For general information regarding FreeBSD Security Advisories,
+including descriptions of the fields above, security branches, and the
+following sections, please visit <URL:https://security.FreeBSD.org/>.
+
+I. Background
+
+Sun RPC is a remote procedure call framework which allows clients to invoke
+procedures in a server process over a network transparently.
+
+The rpcbind(8) utility is a server that converts RPC program numbers into
+universal addresses. It must be running on the host to be able to make RPC
+calls on a server on that machine.
+
+The Sun RPC framework uses a netbuf structure to represent the transport
+specific form of a universal transport address. The structure is expected
+to be opaque to consumers. In the current implementation, the structure
+contains a pointer to a buffer that holds the actual address.
+
+II. Problem Description
+
+In rpcbind(8), netbuf structures are copied directly, which would result in
+two netbuf structures that reference to one shared address buffer. When one
+of the two netbuf structures is freed, access to the other netbuf structure
+would result in an undefined result that may crash the rpcbind(8) daemon.
+
+III. Impact
+
+A remote attacker who can send specifically crafted packets to the rpcbind(8)
+daemon can cause it to crash, resulting in a denial of service condition.
+
+IV. Workaround
+
+No workaround is available, but systems that do not provide the rpcbind(8)
+service to untrusted systems, or do not provide any RPC services are not
+vulnerable. On FreeBSD, typical RPC based services includes NIS and NFS.
+
+Alternatively, rpcbind(8) can be configured to bind on specific IP
+address(es) by using the '-h' option. This may be used to reduce the attack
+vector when the system has multiple network interfaces and when some of them
+would face an untrusted network.
+
+V. Solution
+
+Perform one of the following:
+
+1) Upgrade your vulnerable system to a supported FreeBSD stable or
+release / security branch (releng) dated after the correction date.
+
+Restart the applicable daemons, or reboot the system. Because rpcbind(8)
+is an essential service to all RPC service daemons, these daemons may also
+need to be restarted.
+
+2) To update your vulnerable system via a binary patch:
+
+Systems running a RELEASE version of FreeBSD on the i386 or amd64
+platforms can be updated via the freebsd-update(8) utility:
+
+# freebsd-update fetch
+# freebsd-update install
+
+Restart the applicable daemons, or reboot the system. Because rpcbind(8)
+is an essential service to all RPC service daemons, these daemons may also
+need to be restarted.
+
+3) To update your vulnerable system via a source code patch:
+
+The following patches have been verified to apply to the applicable
+FreeBSD release branches.
+
+a) Download the relevant patch from the location below, and verify the
+detached PGP signature using your PGP utility.
+
+# fetch https://security.FreeBSD.org/patches/SA-15:24/rpcbind.patch
+# fetch https://security.FreeBSD.org/patches/SA-15:24/rpcbind.patch.asc
+# gpg --verify rpcbind.patch.asc
+
+b) Apply the patch. Execute the following commands as root:
+
+# cd /usr/src
+# patch < /path/to/patch
+
+c) Recompile the operating system using buildworld and installworld as
+described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
+
+Restart the applicable daemons, or reboot the system.
+
+VI. Correction details
+
+The following list contains the correction revision numbers for each
+affected branch.
+
+Branch/path Revision
+- -------------------------------------------------------------------------
+stable/9/ r288384
+releng/9.3/ r288385
+stable/10/ r288384
+releng/10.1/ r288385
+releng/10.2/ r288385
+- -------------------------------------------------------------------------
+
+To see which files were modified by a particular revision, run the
+following command, replacing NNNNNN with the revision number, on a
+machine with Subversion installed:
+
+# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
+
+Or visit the following URL, replacing NNNNNN with the revision number:
+
+<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
+
+VII. References
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7236>
+
+<URL:https://bugzilla.suse.com/show_bug.cgi?id=946204>
+
+The latest revision of this advisory is available at
+<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:24.rpcbind.asc>
+-----BEGIN PGP SIGNATURE-----
+Version: GnuPG v2.1.8 (FreeBSD)
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+=WO98
+-----END PGP SIGNATURE-----
Added: head/share/security/patches/SA-15:24/rpcbind.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/patches/SA-15:24/rpcbind.patch Tue Sep 29 18:14:20 2015 (r47456)
@@ -0,0 +1,65 @@
+Index: usr.sbin/rpcbind/rpcb_svc_com.c
+===================================================================
+--- usr.sbin/rpcbind/rpcb_svc_com.c (revision 288019)
++++ usr.sbin/rpcbind/rpcb_svc_com.c (working copy)
+@@ -47,6 +47,7 @@
+ #include <rpc/rpc.h>
+ #include <rpc/rpcb_prot.h>
+ #include <rpc/svc_dg.h>
++#include <assert.h>
+ #include <netconfig.h>
+ #include <errno.h>
+ #include <syslog.h>
+@@ -1047,19 +1048,31 @@ netbufcmp(struct netbuf *n1, struct netbuf *n2)
+ return ((n1->len != n2->len) || memcmp(n1->buf, n2->buf, n1->len));
+ }
+
++static bool_t
++netbuf_copybuf(struct netbuf *dst, const struct netbuf *src)
++{
++
++ assert(dst->buf == NULL);
++
++ if ((dst->buf = malloc(src->len)) == NULL)
++ return (FALSE);
++
++ dst->maxlen = dst->len = src->len;
++ memcpy(dst->buf, src->buf, src->len);
++ return (TRUE);
++}
++
+ static struct netbuf *
+ netbufdup(struct netbuf *ap)
+ {
+ struct netbuf *np;
+
+- if ((np = malloc(sizeof(struct netbuf))) == NULL)
++ if ((np = calloc(1, sizeof(struct netbuf))) == NULL)
+ return (NULL);
+- if ((np->buf = malloc(ap->len)) == NULL) {
++ if (netbuf_copybuf(np, ap) == FALSE) {
+ free(np);
+ return (NULL);
+ }
+- np->maxlen = np->len = ap->len;
+- memcpy(np->buf, ap->buf, ap->len);
+ return (np);
+ }
+
+@@ -1067,6 +1080,7 @@ static void
+ netbuffree(struct netbuf *ap)
+ {
+ free(ap->buf);
++ ap->buf = NULL;
+ free(ap);
+ }
+
+@@ -1184,7 +1198,7 @@ xprt_set_caller(SVCXPRT *xprt, struct finfo *fi)
+ {
+ u_int32_t *xidp;
+
+- *(svc_getrpccaller(xprt)) = *(fi->caller_addr);
++ netbuf_copybuf(svc_getrpccaller(xprt), fi->caller_addr);
+ xidp = __rpcb_get_dg_xidp(xprt);
+ *xidp = fi->caller_xid;
+ }
Added: head/share/security/patches/SA-15:24/rpcbind.patch.asc
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/patches/SA-15:24/rpcbind.patch.asc Tue Sep 29 18:14:20 2015 (r47456)
@@ -0,0 +1,17 @@
+-----BEGIN PGP SIGNATURE-----
+Version: GnuPG v2.1.8 (FreeBSD)
+
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+O0Coptza3F8VscwY2pXu
+=D7Pg
+-----END PGP SIGNATURE-----
Modified: head/share/xml/advisories.xml
==============================================================================
--- head/share/xml/advisories.xml Tue Sep 29 11:52:14 2015 (r47455)
+++ head/share/xml/advisories.xml Tue Sep 29 18:14:20 2015 (r47456)
@@ -11,6 +11,14 @@
<name>9</name>
<day>
+ <name>29</name>
+
+ <advisory>
+ <name>FreeBSD-SA-15:24.rpcbind</name>
+ </advisory>
+ </day>
+
+ <day>
<name>2</name>
<advisory>
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