bug#26781: rpcbind, libtirpc CVE-2017-8779

bug#26781: rpcbind, libtirpc CVE-2017-8779

[Leo Famulari]

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These patches update libtirpc and rpcbind to the latest release and fix
CVE-2017-8779 ("rpcbomb").

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/

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From a021cd8f8302a69d7865e696675b1de1d55a5b43 Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Thu, 4 May 2017 21:04:33 -0400
Subject: [PATCH 1/3] gnu: rpcbind: Update to 0.2.4.

* gnu/packages/onc-rpc.scm (rpcbind): Update to 0.2.4.
---
 gnu/packages/onc-rpc.scm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/onc-rpc.scm b/gnu/packages/onc-rpc.scm
index 5f67823a4..31e2388f0 100644
--- a/gnu/packages/onc-rpc.scm
+++ b/gnu/packages/onc-rpc.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 John Darrington <jmd@gnu.org>
+;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -66,7 +67,7 @@ IPv4 and IPv6.  ONC RPC is notably used by the network file system (NFS).")
 (define-public rpcbind
   (package
     (name "rpcbind")
-    (version "0.2.3")
+    (version "0.2.4")
     (source
      (origin
       (method url-fetch)
@@ -75,7 +76,7 @@ IPv4 and IPv6.  ONC RPC is notably used by the network file system (NFS).")
                           name "-" version ".tar.bz2"))
       (sha256
        (base32
-        "0yyjzv4161rqxrgjcijkrawnk55rb96ha0pav48s03l2klx855wq"))))
+        "0rjc867mdacag4yqvs827wqhkh27135rp9asj06ixhf71m9rljh7"))))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags
-- 
2.12.2


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From 66b36606fe00d3720cd20ec1ce1a1280bde627ec Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Thu, 4 May 2017 21:05:44 -0400
Subject: [PATCH 2/3] gnu: libtirpc: Update to 1.0.1.

* gnu/packages/onc-rpc.scm (libtirpc): Update to 1.0.1.
---
 gnu/packages/onc-rpc.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/onc-rpc.scm b/gnu/packages/onc-rpc.scm
index 31e2388f0..c852f9a4a 100644
--- a/gnu/packages/onc-rpc.scm
+++ b/gnu/packages/onc-rpc.scm
@@ -29,7 +29,7 @@
 (define-public libtirpc
   (package
     (name "libtirpc")
-    (version "0.2.4")
+    (version "1.0.1")
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://sourceforge/libtirpc/libtirpc/"
@@ -37,7 +37,7 @@
                                   version ".tar.bz2"))
               (sha256
                (base32
-                "18a337wa4amf0k21wnimp3yzs5l3cxqndz4x3x8bm993zhfy5hs5"))))
+                "17mqrdgsgp9m92pmq7bvr119svdg753prqqxmg4cnz5y657rfmji"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases
-- 
2.12.2


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From 6045f61a68907491ffb2637c5e8315e94b31dcee Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Thu, 4 May 2017 21:26:03 -0400
Subject: [PATCH 3/3] gnu: rpcbind, libtirpc: Fix CVE-2017-8779.

* gnu/packages/patches/libtirpc-CVE-2017-8779.patch,
gnu/packages/patches/rpcbind-CVE-2017-8779.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/onc-rpc.scm (rpcbind, libtirpc)[source]: Use them.
---
 gnu/local.mk                                      |   2 +
 gnu/packages/onc-rpc.scm                          |   3 +
 gnu/packages/patches/libtirpc-CVE-2017-8779.patch | 263 ++++++++++++++++++++++
 gnu/packages/patches/rpcbind-CVE-2017-8779.patch  |  29 +++
 4 files changed, 297 insertions(+)
 create mode 100644 gnu/packages/patches/libtirpc-CVE-2017-8779.patch
 create mode 100644 gnu/packages/patches/rpcbind-CVE-2017-8779.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index ce7ecc36c..6dbee2b5e 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -744,6 +744,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libtiff-invalid-read.patch		\
   %D%/packages/patches/libtiff-null-dereference.patch		\
   %D%/packages/patches/libtiff-tiffcp-underflow.patch		\
+  %D%/packages/patches/libtirpc-CVE-2017-8779.patch		\
   %D%/packages/patches/libtorrent-rasterbar-boost-compat.patch	\
   %D%/packages/patches/libtool-skip-tests2.patch		\
   %D%/packages/patches/libunwind-CVE-2015-3239.patch		\
@@ -924,6 +925,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/readline-6.2-CVE-2014-2524.patch		\
   %D%/packages/patches/readline-7.0-mingw.patch			\
   %D%/packages/patches/ripperx-missing-file.patch		\
+  %D%/packages/patches/rpcbind-CVE-2017-8779.patch		\
   %D%/packages/patches/rpm-CVE-2014-8118.patch			\
   %D%/packages/patches/rsem-makefile.patch			\
   %D%/packages/patches/ruby-concurrent-ignore-broken-test.patch	\
diff --git a/gnu/packages/onc-rpc.scm b/gnu/packages/onc-rpc.scm
index c852f9a4a..a76ac36ea 100644
--- a/gnu/packages/onc-rpc.scm
+++ b/gnu/packages/onc-rpc.scm
@@ -22,6 +22,7 @@
   #:use-module (guix licenses)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (gnu packages)
   #:use-module (gnu packages kerberos)
   #:use-module (gnu packages pkg-config)
   #:use-module (guix build-system gnu))
@@ -35,6 +36,7 @@
               (uri (string-append "mirror://sourceforge/libtirpc/libtirpc/"
                                   version "/libtirpc-"
                                   version ".tar.bz2"))
+              (patches (search-patches "libtirpc-CVE-2017-8779.patch"))
               (sha256
                (base32
                 "17mqrdgsgp9m92pmq7bvr119svdg753prqqxmg4cnz5y657rfmji"))))
@@ -74,6 +76,7 @@ IPv4 and IPv6.  ONC RPC is notably used by the network file system (NFS).")
       (uri (string-append "mirror://sourceforge/" name "/" name "/"
                           version "/"
                           name "-" version ".tar.bz2"))
+      (patches (search-patches "rpcbind-CVE-2017-8779.patch"))
       (sha256
        (base32
         "0rjc867mdacag4yqvs827wqhkh27135rp9asj06ixhf71m9rljh7"))))
diff --git a/gnu/packages/patches/libtirpc-CVE-2017-8779.patch b/gnu/packages/patches/libtirpc-CVE-2017-8779.patch
new file mode 100644
index 000000000..742e64df2
--- /dev/null
+++ b/gnu/packages/patches/libtirpc-CVE-2017-8779.patch
@@ -0,0 +1,263 @@
+Fix CVE-2017-8779:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
+
+Patch copied from the bug reporter's 3rd-party repository:
+
+https://github.com/guidovranken/rpcbomb/blob/master/libtirpc_patch.txt
+
+diff --git a/src/rpc_generic.c b/src/rpc_generic.c
+index 2f09a8f..589cbd5 100644
+--- a/src/rpc_generic.c
++++ b/src/rpc_generic.c
+@@ -615,6 +615,9 @@ __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
+ 
+ 	switch (af) {
+ 	case AF_INET:
++		if (nbuf->len < sizeof(*sin)) {
++			return NULL;
++		}
+ 		sin = nbuf->buf;
+ 		if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
+ 		    == NULL)
+@@ -626,6 +629,9 @@ __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
+ 		break;
+ #ifdef INET6
+ 	case AF_INET6:
++		if (nbuf->len < sizeof(*sin6)) {
++			return NULL;
++		}
+ 		sin6 = nbuf->buf;
+ 		if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
+ 		    == NULL)
+@@ -667,6 +673,8 @@ __rpc_uaddr2taddr_af(int af, const char *uaddr)
+ 
+ 	port = 0;
+ 	sin = NULL;
++	if (uaddr == NULL)
++		return NULL;
+ 	addrstr = strdup(uaddr);
+ 	if (addrstr == NULL)
+ 		return NULL;
+diff --git a/src/rpcb_prot.c b/src/rpcb_prot.c
+index 43fd385..a923c8e 100644
+--- a/src/rpcb_prot.c
++++ b/src/rpcb_prot.c
+@@ -41,6 +41,7 @@
+ #include <rpc/types.h>
+ #include <rpc/xdr.h>
+ #include <rpc/rpcb_prot.h>
++#include "rpc_com.h"
+ 
+ bool_t
+ xdr_rpcb(xdrs, objp)
+@@ -53,13 +54,13 @@ xdr_rpcb(xdrs, objp)
+ 	if (!xdr_u_int32_t(xdrs, &objp->r_vers)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_netid, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_addr, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_addr, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_owner, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_owner, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	return (TRUE);
+@@ -159,19 +160,19 @@ xdr_rpcb_entry(xdrs, objp)
+ 	XDR *xdrs;
+ 	rpcb_entry *objp;
+ {
+-	if (!xdr_string(xdrs, &objp->r_maddr, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_maddr, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_nc_netid, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_nc_netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	if (!xdr_u_int32_t(xdrs, &objp->r_nc_semantics)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_nc_protofmly, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_nc_protofmly, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->r_nc_proto, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->r_nc_proto, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	return (TRUE);
+@@ -292,7 +293,7 @@ xdr_rpcb_rmtcallres(xdrs, p)
+ 	bool_t dummy;
+ 	struct r_rpcb_rmtcallres *objp = (struct r_rpcb_rmtcallres *)(void *)p;
+ 
+-	if (!xdr_string(xdrs, &objp->addr, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->addr, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	if (!xdr_u_int(xdrs, &objp->results.results_len)) {
+@@ -312,6 +313,11 @@ xdr_netbuf(xdrs, objp)
+ 	if (!xdr_u_int32_t(xdrs, (u_int32_t *) &objp->maxlen)) {
+ 		return (FALSE);
+ 	}
++
++	if (objp->maxlen > RPC_MAXDATASIZE) {
++		return (FALSE);
++	}
++
+ 	dummy = xdr_bytes(xdrs, (char **)&(objp->buf),
+ 			(u_int *)&(objp->len), objp->maxlen);
+ 	return (dummy);
+diff --git a/src/rpcb_st_xdr.c b/src/rpcb_st_xdr.c
+index 08db745..28e6a48 100644
+--- a/src/rpcb_st_xdr.c
++++ b/src/rpcb_st_xdr.c
+@@ -37,6 +37,7 @@
+ 
+ 
+ #include <rpc/rpc.h>
++#include "rpc_com.h"
+ 
+ /* Link list of all the stats about getport and getaddr */
+ 
+@@ -58,7 +59,7 @@ xdr_rpcbs_addrlist(xdrs, objp)
+ 	    if (!xdr_int(xdrs, &objp->failure)) {
+ 		return (FALSE);
+ 	    }
+-	    if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++	    if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	    }
+ 
+@@ -109,7 +110,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ 		IXDR_PUT_INT32(buf, objp->failure);
+ 		IXDR_PUT_INT32(buf, objp->indirect);
+ 	}
+-	if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	if (!xdr_pointer(xdrs, (char **)&objp->next,
+@@ -147,7 +148,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ 		objp->failure = (int)IXDR_GET_INT32(buf);
+ 		objp->indirect = (int)IXDR_GET_INT32(buf);
+ 	}
+-	if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	if (!xdr_pointer(xdrs, (char **)&objp->next,
+@@ -175,7 +176,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ 	if (!xdr_int(xdrs, &objp->indirect)) {
+ 		return (FALSE);
+ 	}
+-	if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++	if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ 		return (FALSE);
+ 	}
+ 	if (!xdr_pointer(xdrs, (char **)&objp->next,
+diff --git a/src/xdr.c b/src/xdr.c
+index f3fb9ad..b9a1558 100644
+--- a/src/xdr.c
++++ b/src/xdr.c
+@@ -42,8 +42,10 @@
+ #include <stdlib.h>
+ #include <string.h>
+ 
++#include <rpc/rpc.h>
+ #include <rpc/types.h>
+ #include <rpc/xdr.h>
++#include <rpc/rpc_com.h>
+ 
+ typedef quad_t          longlong_t;     /* ANSI long long type */
+ typedef u_quad_t        u_longlong_t;   /* ANSI unsigned long long type */
+@@ -53,7 +55,6 @@ typedef u_quad_t        u_longlong_t;   /* ANSI unsigned long long type */
+  */
+ #define XDR_FALSE	((long) 0)
+ #define XDR_TRUE	((long) 1)
+-#define LASTUNSIGNED	((u_int) 0-1)
+ 
+ /*
+  * for unit alignment
+@@ -629,6 +630,7 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ {
+ 	char *sp = *cpp;  /* sp is the actual string pointer */
+ 	u_int nodesize;
++	bool_t ret, allocated = FALSE;
+ 
+ 	/*
+ 	 * first deal with the length since xdr bytes are counted
+@@ -652,6 +654,7 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ 		}
+ 		if (sp == NULL) {
+ 			*cpp = sp = mem_alloc(nodesize);
++			allocated = TRUE;
+ 		}
+ 		if (sp == NULL) {
+ 			warnx("xdr_bytes: out of memory");
+@@ -660,7 +663,14 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ 		/* FALLTHROUGH */
+ 
+ 	case XDR_ENCODE:
+-		return (xdr_opaque(xdrs, sp, nodesize));
++		ret = xdr_opaque(xdrs, sp, nodesize);
++		if ((xdrs->x_op == XDR_DECODE) && (ret == FALSE)) {
++			if (allocated == TRUE) {
++				free(sp);
++				*cpp = NULL;
++			}
++		}
++		return (ret);
+ 
+ 	case XDR_FREE:
+ 		if (sp != NULL) {
+@@ -754,6 +764,7 @@ xdr_string(xdrs, cpp, maxsize)
+ 	char *sp = *cpp;  /* sp is the actual string pointer */
+ 	u_int size;
+ 	u_int nodesize;
++	bool_t ret, allocated = FALSE;
+ 
+ 	/*
+ 	 * first deal with the length since xdr strings are counted-strings
+@@ -793,8 +804,10 @@ xdr_string(xdrs, cpp, maxsize)
+ 	switch (xdrs->x_op) {
+ 
+ 	case XDR_DECODE:
+-		if (sp == NULL)
++		if (sp == NULL) {
+ 			*cpp = sp = mem_alloc(nodesize);
++			allocated = TRUE;
++		}
+ 		if (sp == NULL) {
+ 			warnx("xdr_string: out of memory");
+ 			return (FALSE);
+@@ -803,7 +816,14 @@ xdr_string(xdrs, cpp, maxsize)
+ 		/* FALLTHROUGH */
+ 
+ 	case XDR_ENCODE:
+-		return (xdr_opaque(xdrs, sp, size));
++		ret = xdr_opaque(xdrs, sp, size);
++		if ((xdrs->x_op == XDR_DECODE) && (ret == FALSE)) {
++			if (allocated == TRUE) {
++				free(sp);
++				*cpp = NULL;
++			}
++		}
++		return (ret);
+ 
+ 	case XDR_FREE:
+ 		mem_free(sp, nodesize);
+@@ -823,7 +843,7 @@ xdr_wrapstring(xdrs, cpp)
+ 	XDR *xdrs;
+ 	char **cpp;
+ {
+-	return xdr_string(xdrs, cpp, LASTUNSIGNED);
++	return xdr_string(xdrs, cpp, RPC_MAXDATASIZE);
+ }
+ 
+ /*
diff --git a/gnu/packages/patches/rpcbind-CVE-2017-8779.patch b/gnu/packages/patches/rpcbind-CVE-2017-8779.patch
new file mode 100644
index 000000000..6ca93ff12
--- /dev/null
+++ b/gnu/packages/patches/rpcbind-CVE-2017-8779.patch
@@ -0,0 +1,29 @@
+Fix CVE-2017-8779:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
+
+Patch copied from the bug reporter's 3rd-party repository:
+
+https://github.com/guidovranken/rpcbomb/blob/master/rpcbind_patch.txt
+
+diff --git a/src/rpcb_svc_com.c b/src/rpcb_svc_com.c
+index 5862c26..e11f61b 100644
+--- a/src/rpcb_svc_com.c
++++ b/src/rpcb_svc_com.c
+@@ -48,6 +48,7 @@
+ #include <rpc/rpc.h>
+ #include <rpc/rpcb_prot.h>
+ #include <rpc/svc_dg.h>
++#include <rpc/rpc_com.h>
+ #include <netconfig.h>
+ #include <errno.h>
+ #include <syslog.h>
+@@ -432,7 +433,7 @@ rpcbproc_taddr2uaddr_com(void *arg, struct svc_req *rqstp /*__unused*/,
+ static bool_t
+ xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
+ {
+-	return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), ~0));
++	return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), RPC_MAXDATASIZE));
+ }
+ 
+ /*
-- 
2.12.2


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bug#26781: rpcbind, libtirpc CVE-2017-8779

[Kei Kebreau]

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Leo Famulari <leo@famulari.name> writes:

> These patches update libtirpc and rpcbind to the latest release and fix
> CVE-2017-8779 ("rpcbomb").
>
> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
> https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/

LGTM.

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bug#26781: rpcbind, libtirpc CVE-2017-8779

[Ludovic Courtès]

Leo Famulari <leo@famulari.name> skribis:

> These patches update libtirpc and rpcbind to the latest release and fix
> CVE-2017-8779 ("rpcbomb").
>
> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
> https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/

Excellent.  The 3 patches LGTM.

Thank you Leo!

Ludo’.

bug#26781: rpcbind, libtirpc CVE-2017-8779

[Leo Famulari]

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On Fri, May 05, 2017 at 09:56:44AM +0200, Ludovic Courtès wrote:
> Leo Famulari <leo@famulari.name> skribis:
> 
> > These patches update libtirpc and rpcbind to the latest release and fix
> > CVE-2017-8779 ("rpcbomb").
> >
> > https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779
> > https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/
> 
> Excellent.  The 3 patches LGTM.
> 
> Thank you Leo!

Thanks for the reviews! Pushed!

I sent a followup patch to update nfs-utils. Somebody who uses NFS
should review it.

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