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openssh: CVE-2011-4327 

A security flaw was found in the way ssh-keysign,
a ssh helper program for host based authentication,
attempted to retrieve enough entropy information on configurations that
lacked a built-in entropy pool in OpenSSL (a ssh-rand-helper program would
be executed to retrieve the entropy from the system environment).
A local attacker could use this flaw to obtain unauthorized access to host keys
via ptrace(2) process trace attached to the 'ssh-rand-helper' program.

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4327
http://www.openssh.com/txt/portable-keysign-rand-helper.adv

[YOCTO #3493]

(From OE-Core rev: bdce08215396e5ab99ada5fa0f62c3b002a44582)

Signed-off-by: Li Wang <li.wang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Li Wang 2012-11-27 14:13:21 +08:00 committed by Richard Purdie
parent 8d1aed5dd2
commit b629d94030
2 changed files with 29 additions and 1 deletions
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27
meta/recipes-connectivity/openssh/openssh-6.0p1/openssh-CVE-2011-4327.patch Normal file
View File

@ -0,0 +1,27 @@
openssh-CVE-2011-4327
A security flaw was found in the way ssh-keysign,
a ssh helper program for host based authentication,
attempted to retrieve enough entropy information on configurations that
lacked a built-in entropy pool in OpenSSL (a ssh-rand-helper program would
be executed to retrieve the entropy from the system environment).
A local attacker could use this flaw to obtain unauthorized access to host keys
via ptrace(2) process trace attached to the 'ssh-rand-helper' program.
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4327
http://www.openssh.com/txt/portable-keysign-rand-helper.adv
Signed-off-by: Li Wang <li.wang@windriver.com>
--- a/ssh-keysign.c
+++ b/ssh-keysign.c
@@ -170,6 +170,10 @@
key_fd[i++] = open(_PATH_HOST_DSA_KEY_FILE, O_RDONLY);
key_fd[i++] = open(_PATH_HOST_ECDSA_KEY_FILE, O_RDONLY);
key_fd[i++] = open(_PATH_HOST_RSA_KEY_FILE, O_RDONLY);
+ if (fcntl(key_fd[0], F_SETFD, FD_CLOEXEC) != 0 ||
+ fcntl(key_fd[1], F_SETFD, FD_CLOEXEC) != 0 ||
+ fcntl(key_fd[2], F_SETFD, FD_CLOEXEC) != 0)
+ fatal("fcntl failed");
original_real_uid = getuid(); /* XXX readconf.c needs this */
if ((pw = getpwuid(original_real_uid)) == NULL)

3
meta/recipes-connectivity/openssh/openssh_6.0p1.bb
View File

@ -7,7 +7,7 @@ SECTION = "console/network"
LICENSE = "BSD"
LIC_FILES_CHKSUM = "file://LICENCE;md5=e326045657e842541d3f35aada442507"
PR = "r3"
PR = "r4"
DEPENDS = "zlib openssl"
DEPENDS += "${@base_contains('DISTRO_FEATURES', 'pam', 'libpam', '', d)}"
@ -23,6 +23,7 @@ SRC_URI = "ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar.
file://sshd_config \
file://ssh_config \
file://init \
file://openssh-CVE-2011-4327.patch \
${@base_contains('DISTRO_FEATURES', 'pam', '${PAM_SRC_URI}', '', d)}"
PAM_SRC_URI = "file://sshd"