gnu: libssh: Update to 0.7.3 [fixes CVE-2016-0739].
* gnu/packages/patches/libssh-CVE-2014-0017.patch: Delete file. * gnu/packages/patches/libssh-0.6.5-CVE-2016-0739.patch: New file. * gnu-system.am (dist_patch_DATA): Adjust accordingly. * gnu/packages/ssh.scm (libssh): Update to 0.7.3. (libssh-0.5): Rename to... (libssh-0.6): ... this. Update to 0.6.5. [source]: Add patch for CVE-2016-0739. (guile-ssh)[inputs]: Use libssh-0.6. Modified-By: Mark H Weaver <mhw@netris.org>
This commit is contained in:
Leo Famulari
Mark H Weaver
parent
78d80c5c6a
commit
85267efb2a
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@ -566,12 +566,12 @@ dist_patch_DATA = \
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gnu/packages/patches/libmad-armv7-thumb-pt2.patch \
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gnu/packages/patches/libmad-frame-length.patch \
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gnu/packages/patches/libmad-mips-newgcc.patch \
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gnu/packages/patches/libssh-0.6.5-CVE-2016-0739.patch \
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gnu/packages/patches/libtheora-config-guess.patch \
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gnu/packages/patches/libtiff-CVE-2015-8665+CVE-2015-8683.patch \
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gnu/packages/patches/libtiff-oob-accesses-in-decode.patch \
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gnu/packages/patches/libtiff-oob-write-in-nextdecode.patch \
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gnu/packages/patches/libtool-skip-tests2.patch \
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gnu/packages/patches/libssh-CVE-2014-0017.patch \
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gnu/packages/patches/libunwind-CVE-2015-3239.patch \
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gnu/packages/patches/libwmf-CAN-2004-0941.patch \
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gnu/packages/patches/libwmf-CVE-2006-3376.patch \
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@ -0,0 +1,77 @@
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Fix CVE-2016-0739 (Weak Diffie-Hellman secret generation in
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dh_generate_x() and dh_generate_y()).
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"Due to a byte/bit confusion, the DH secret was too short. This file was
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completely reworked and will be commited in a future version."
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Source:
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https://git.libssh.org/projects/libssh.git/commit/?id=f8d0026c65fc8a55748ae481758e2cf376c26c86
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This patch was created by upstream for libssh-0.7.3, but applied without
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modification to libssh-0.6.3 by Debian. In Guix, we apply it without
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modification to libssh-0.6.5.
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References:
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https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-0739
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0739
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https://security-tracker.debian.org/tracker/CVE-2016-0739
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---
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src/dh.c | 22 +++++++++++++++++-----
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1 file changed, 17 insertions(+), 5 deletions(-)
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diff --git a/src/dh.c b/src/dh.c
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index e489a1d..d27b66e 100644
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--- a/src/dh.c
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+++ b/src/dh.c
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@@ -227,15 +227,21 @@ void ssh_crypto_finalize(void) {
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}
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int dh_generate_x(ssh_session session) {
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+ int keysize;
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+ if (session->next_crypto->kex_type == SSH_KEX_DH_GROUP1_SHA1) {
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+ keysize = 1023;
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+ } else {
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+ keysize = 2047;
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+ }
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session->next_crypto->x = bignum_new();
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if (session->next_crypto->x == NULL) {
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return -1;
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}
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#ifdef HAVE_LIBGCRYPT
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- bignum_rand(session->next_crypto->x, 128);
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+ bignum_rand(session->next_crypto->x, keysize);
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#elif defined HAVE_LIBCRYPTO
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- bignum_rand(session->next_crypto->x, 128, 0, -1);
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+ bignum_rand(session->next_crypto->x, keysize, -1, 0);
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#endif
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/* not harder than this */
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@@ -248,15 +254,21 @@ int dh_generate_x(ssh_session session) {
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/* used by server */
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int dh_generate_y(ssh_session session) {
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- session->next_crypto->y = bignum_new();
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+ int keysize;
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+ if (session->next_crypto->kex_type == SSH_KEX_DH_GROUP1_SHA1) {
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+ keysize = 1023;
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+ } else {
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+ keysize = 2047;
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+ }
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+ session->next_crypto->y = bignum_new();
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if (session->next_crypto->y == NULL) {
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return -1;
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}
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#ifdef HAVE_LIBGCRYPT
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- bignum_rand(session->next_crypto->y, 128);
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+ bignum_rand(session->next_crypto->y, keysize);
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#elif defined HAVE_LIBCRYPTO
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- bignum_rand(session->next_crypto->y, 128, 0, -1);
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+ bignum_rand(session->next_crypto->y, keysize, -1, 0);
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#endif
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/* not harder than this */
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--
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cgit v0.12
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@ -1,89 +0,0 @@
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Patch from libssh 0.6, with bind.c hunk adjusted for 0.5.5.
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From e99246246b4061f7e71463f8806b9dcad65affa0 Mon Sep 17 00:00:00 2001
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From: Aris Adamantiadis <aris@0xbadc0de.be>
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Date: Wed, 05 Feb 2014 20:24:12 +0000
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Subject: security: fix for vulnerability CVE-2014-0017
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When accepting a new connection, a forking server based on libssh forks
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and the child process handles the request. The RAND_bytes() function of
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openssl doesn't reset its state after the fork, but simply adds the
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current process id (getpid) to the PRNG state, which is not guaranteed
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to be unique.
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This can cause several children to end up with same PRNG state which is
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a security issue.
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---
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diff --git a/include/libssh/wrapper.h b/include/libssh/wrapper.h
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index 7374a88..e8ff32c 100644
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--- a/include/libssh/wrapper.h
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+++ b/include/libssh/wrapper.h
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@@ -70,5 +70,6 @@ int crypt_set_algorithms_server(ssh_session session);
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struct ssh_crypto_struct *crypto_new(void);
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void crypto_free(struct ssh_crypto_struct *crypto);
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+void ssh_reseed(void);
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#endif /* WRAPPER_H_ */
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diff --git a/src/bind.c b/src/bind.c
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index 8d82d0d..03d3403 100644
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--- a/src/bind.c
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+++ b/src/bind.c
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@@ -375,6 +375,8 @@ int ssh_bind_accept(ssh_bind sshbind, ss
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session->dsa_key = dsa;
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session->rsa_key = rsa;
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+ /* force PRNG to change state in case we fork after ssh_bind_accept */
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+ ssh_reseed();
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return SSH_OK;
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}
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diff --git a/src/libcrypto.c b/src/libcrypto.c
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index bb1d96a..d8cc795 100644
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--- a/src/libcrypto.c
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+++ b/src/libcrypto.c
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@@ -23,6 +23,7 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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+#include <sys/time.h>
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#include "libssh/priv.h"
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#include "libssh/session.h"
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@@ -38,6 +39,8 @@
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#include <openssl/rsa.h>
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#include <openssl/hmac.h>
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#include <openssl/opensslv.h>
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+#include <openssl/rand.h>
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+
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#ifdef HAVE_OPENSSL_AES_H
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#define HAS_AES
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#include <openssl/aes.h>
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@@ -74,6 +77,12 @@ static int alloc_key(struct ssh_cipher_struct *cipher) {
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return 0;
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}
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+void ssh_reseed(void){
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+ struct timeval tv;
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+ gettimeofday(&tv, NULL);
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+ RAND_add(&tv, sizeof(tv), 0.0);
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+}
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+
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SHACTX sha1_init(void) {
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SHACTX c = malloc(sizeof(*c));
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if (c == NULL) {
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diff --git a/src/libgcrypt.c b/src/libgcrypt.c
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index 899bccd..4617901 100644
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--- a/src/libgcrypt.c
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+++ b/src/libgcrypt.c
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@@ -45,6 +45,9 @@ static int alloc_key(struct ssh_cipher_struct *cipher) {
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return 0;
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}
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+void ssh_reseed(void){
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+ }
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+
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SHACTX sha1_init(void) {
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SHACTX ctx = NULL;
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gcry_md_open(&ctx, GCRY_MD_SHA1, 0);
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--
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cgit v0.9.1
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@ -45,15 +45,15 @@
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(define-public libssh
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(package
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(name "libssh")
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(version "0.6.5")
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(version "0.7.3")
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(source (origin
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(method url-fetch)
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(uri (string-append
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"https://red.libssh.org/attachments/download/121/libssh-"
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"https://red.libssh.org/attachments/download/195/libssh-"
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version ".tar.xz"))
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(sha256
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(base32
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"0b6wyx6bwbb8jpn8x4rhlrdiqwqrwrs0mxjmrnqykm9kw1ijgm8g"))))
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"165g49i4kmm3bfsjm0n8hm21kadv79g9yjqyq09138jxanz4dvr6"))))
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(build-system cmake-build-system)
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(arguments
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'(#:configure-flags '("-DWITH_GCRYPT=ON")
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@ -71,17 +71,19 @@ remote applications.")
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(home-page "http://www.libssh.org")
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(license license:lgpl2.1+)))
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(define libssh-0.5 ; kept private
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(define libssh-0.6 ; kept private for use in guile-ssh
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(package (inherit libssh)
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(version "0.5.5")
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(version "0.6.5")
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(source (origin
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(method url-fetch)
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(uri (string-append "https://red.libssh.org/attachments/download/51/libssh-"
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version ".tar.gz"))
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(uri (string-append "https://red.libssh.org/attachments/"
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"download/121/libssh-"
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version ".tar.xz"))
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(sha256
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(base32
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"17cfdff4hc0ijzrr15biq29fiabafz0bw621zlkbwbc1zh2hzpy0"))
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(patches (list (search-patch "libssh-CVE-2014-0017.patch")))))))
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"0b6wyx6bwbb8jpn8x4rhlrdiqwqrwrs0mxjmrnqykm9kw1ijgm8g"))
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(patches (list
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(search-patch "libssh-0.6.5-CVE-2016-0739.patch")))))))
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(define-public libssh2
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(package
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@ -255,7 +257,7 @@ Additionally, various channel-specific options can be negotiated.")
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("pkg-config" ,pkg-config)
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("which" ,which)))
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(inputs `(("guile" ,guile-2.0)
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("libssh" ,libssh)
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("libssh" ,libssh-0.6)
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("libgcrypt" ,libgcrypt)))
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(synopsis "Guile bindings to libssh")
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(description
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