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DescriptionRalph Angenendt
2014-05-28 13:04:06 UTC
This has come up in the CentOS bug tracker: http://bugs.centos.org/view.php?id=7139
At least the following package is affected - openldap-servers-2.4.23-34.el6_5.1.x86_64
After a short discussion with the reporter I decided to open this bug here.
Short description (taken from the bug report):
When running /usr/libexec/openldap-generate-server-cert.sh, a tmp file with a random name is being generated, and should be deleted after use. A wrong variable is used in deletion, leaving security relevant material lying around in an insecure fashion.
In the trace below you can see the CERT_RANDOM file being generated, but it is attempted to delete $RANDOM_DATA after use.
This is wrong. It should have been "rm -rf $CERT_RANDOM".
After completion of the script, the file is left behind in /tmp, containing random bytes used to generate the cert. This is a security issue, even if the permissions of the file are restrictive.
How to reproduce:
[root@cloud01 ~]# cd /etc/openldap/certs
[root@cloud01 certs]# \rm -rf *
[root@cloud01 certs]# echo keks > password
[root@cloud01 certs]# certutil -d $(pwd) -N -f password
[root@cloud01 certs]# bash -xv /usr/libexec/openldap/generate-server-cert.sh
...
CERT_RANDOM=$(mktemp)
mktemp)
mktemp
++ mktemp
+ CERT_RANDOM=/tmp/tmp.toBUDh50mG
dd if=$RANDOM_SOURCE bs=$CERT_RANDOM_BYTES count=1 of=$CERT_RANDOM &>/dev/null
+ dd if=/dev/urandom bs=256 count=1 of=/tmp/tmp.toBUDh50mG
certutil -d "$CERTDB_DIR" -f "$PASSWORD_FILE" -z "$CERT_RANDOM" \
-S -x -n "$CERT_NAME" \
-s "CN=$HOSTNAME_FQDN" \
-t TC,, \
-k $CERT_KEY_TYPE -g $CERT_KEY_SIZE \
-v $CERT_VALID_MONTHS \
-8 "$ALT_NAMES" \
&>/dev/null
+ certutil -d /etc/openldap/certs -f /etc/openldap/certs/password -z /tmp/tmp.toBUDh50mG -S -x -n 'OpenLDAP Server' -s CN=cloud01.bki1.syseleven.de -t TC,, -k rsa -g 1024 -v 12 -8 cloud01.bki1.syseleven.de,localhost,localhost.localdomain
rm -f $RANDOM_DATA
+ rm -f
...
[root@cloud01 certs]# ls -l /tmp/tmp.toBUDh50mG
-rw------- 1 root root 256 May 27 15:24 /tmp/tmp.toBUDh50mG
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2014-1426.html