4.3 Medium
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:A/AC:M/Au:N/C:N/I:P/A:P
0.006 Low
EPSS
Percentile
79.1%
IBM SECURITY ADVISORY
First Issued: Mon Jun 29 10:00:16 CDT 2015
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc
Security Bulletin: Vulnerabilities in NTPv4 affect AIX
===============================================================================
SUMMARY:
There are two vulnerabilities in NTPv4 that affect AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2014-9297
https://vulners.com/cve/CVE-2014-9297
DESCRIPTION:
Network Time Protocol (NTP) Project NTP daemon (ntpd) could allow a
remote attacker to conduct spoofing attacks, caused by insufficient
entropy in PRNG. An attacker could exploit this vulnerability to spoof
the IPv6 address ::1 to bypass ACLs and launch further attacks on the
system.
CVSS:
CVSS Base Score: 5.00
CVSS Temporal Score: See
http://xforce.iss.net/xforce/xfdb/100004 for the current score.
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVEID: CVE-2015-1799
https://vulners.com/cve/CVE-2015-1799
DESCRIPTION:
Network Time Protocol (NTP) Project NTP daemon (ntpd) is vulnerable
to a denial of service, caused by an error when using symmetric key
authentication. By sending specially-crafted packets to both peering
hosts, an attacker could exploit this vulnerability to prevent
synchronization.
CVSS:
CVSS Base Score: 5.40
CVSS Temporal Score: See
http://xforce.iss.net/xforce/xfdb/102052 for the current score.
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:A/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED PRODUCTS AND VERSIONS:
AIX 6.1, 7.1
VIOS 2.2.x
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level KEY
--------------------------------------------------------
ntp.rte 6.1.0.0 6.1.6.4 key_w_fs
ntp.rte 7.1.0.0 7.1.0.4 key_w_fs
AIX Fileset (VIOS) Lower Level Upper Level
------------------------------------------------------------
ntp.rte 6.1.0.0(2.2.0.0) 6.1.6.4(2.2.2.6)
ntp.rte 6.1.0.0(2.2.0.0) 6.1.6.4(2.2.3.4)
Note: to find out whether the affected filesets are installed
on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i ntp.rte
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
---------------------------------------------------
6.1.9 IV71094 12/4/15 SP6 key_w_apar
7.1.3 IV71096 2/26/16 SP6 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV71094
http://www.ibm.com/support/docview.wss?uid=isg1IV71096
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
B. FIXES
Fixes are available. The fixes can be downloaded via ftp or
http from:
ftp://aix.software.ibm.com/aix/efixes/security/ntp4_fix.tar
http://aix.software.ibm.com/aix/efixes/security/ntp4_fix.tar
https://aix.software.ibm.com/aix/efixes/security/ntp4_fix.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
AIX Level Interim Fix (*.Z) KEY
------------------------------------------------
6.1 IV71094s0a.150618.epkg.Z key_w_fix
7.1 IV71096s0a.150618.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf ntp4_fix.tar
cd ntp4_fix
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command as the followng:
openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
daa13bf1d503c5e955b86ebd997895bf0bb47d9394f7d858a2628f762a062344 IV71094s0a.150618.epkg.Z key_w_csum
811e3169a1c244a48d6380f8eb1462b47e2c2c8c7db8a20e3165de7fd0bba822 IV71096s0a.150618.epkg.Z key_w_csum
These sums should match exactly. The OpenSSL signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
[email protected] and describe the discrepancy.
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/ntp4_advisory.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Comments regarding the content of this announcement can be
directed to:
[email protected]
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via [email protected] you
can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
B. Download the key from a PGP Public Key Server. The key ID is:
0x28BFAA12
Please contact your local IBM AIX support center for any
assistance.
REFERENCES:
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2:
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Jun 29 10:00:16 CDT 2015
===============================================================================
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an “industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response.” IBM PROVIDES THE CVSS SCORES “AS IS” WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.