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CentOS ProjectNTP_ADVISORY12.ASCHistoryAug 19, 2019 - 4:44 p.m.
There are vulnerabilities in NTPv4 that affect AIX.,Vulnerabilities in NTP affect AIX,Vulnerabilities in NTP affect VIOS
2019-08-1916:44:22
CentOS Project
aix.software.ibm.com
367
CVSS2
5
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.008
Percentile
82.2%
IBM SECURITY ADVISORY
First Issued: Mon Aug 19 16:44:22 CDT 2019
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc
Security Bulletin: Vulnerability in NTP affects AIX (CVE-2019-8936)
===============================================================================
SUMMARY:
There is a vulnerability in NTPv3 and NTPv4 that affects AIX.
===============================================================================
VULNERABILITY DETAILS:
NTPv3 and NTPv4 are vulnerable to:
CVEID: CVE-2019-8936
https://vulners.com/cve/CVE-2019-8936
https://vulners.com/cve/CVE-2019-8936
DESCRIPTION: NTP is vulnerable to a denial of service, caused by a NULL
pointer dereference in ntp_control.c. By sending specially crafted
mode 6 packets, a remote authenticated attacker could exploit this
vulnerability to cause the ntpd daemon to SIGSEGV.
CVSS Base Score: 5.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/158926
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2
VIOS 2.2, 3.1
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
For NTPv3:
Fileset Lower Level Upper Level KEY PRODUCT(S)
---------------------------------------------------------------------
bos.net.tcp.client 6.1.9.0 6.1.9.403 key_w_fs NTPv3
bos.net.tcp.client 7.1.4.0 7.1.4.35 key_w_fs NTPv3
bos.net.tcp.client 7.1.5.0 7.1.5.33 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.1.0 7.2.1.3 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.2.0 7.2.2.17 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.3.0 7.2.3.15 key_w_fs NTPv3
For NTPv4:
Fileset Lower Level Upper Level KEY PRODUCT(S)
---------------------------------------------------------------------
ntp.rte 7.4.2.8100 7.4.2.8121 key_w_fs NTPv4
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 bos.net.tcp.client
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
For NTPv3:
AIX Level APAR Availability SP KEY PRODUCT(S)
------------------------------------------------------------
7.1.4 IJ17061 ** N/A key_w_apar NTPv3
7.1.5 IJ17062 ** SP5 key_w_apar NTPv3
7.2.1 IJ17063 ** N/A key_w_apar NTPv3
7.2.2 IJ17064 ** SP5 key_w_apar NTPv3
7.2.3 IJ17065 ** SP4 key_w_apar NTPv3
VIOS Level APAR Availability SP KEY PRODUCT(S)
----------------------------------------------------------------
2.2.5 IJ17060 ** N/A key_w_apar NTPv3
2.2.6 IJ17060 ** 2.2.6.50 key_w_apar NTPv3
3.1.0 IJ17065 ** 3.1.0.30 key_w_apar NTPv3
For NTPv4:
AIX Level APAR Availability SP KEY PRODUCT(S)
------------------------------------------------------------
7.1.4 IJ17059 ** N/A key_w_apar NTPv4
7.1.5 IJ17059 ** SP5 key_w_apar NTPv4
7.2.1 IJ17059 ** N/A key_w_apar NTPv4
7.2.2 IJ17059 ** SP5 key_w_apar NTPv4
7.2.3 IJ17059 ** SP4 key_w_apar NTPv4
VIOS Level APAR Availability SP KEY PRODUCT(S)
----------------------------------------------------------------
2.2.5 IJ17059 ** N/A key_w_apar NTPv4
2.2.6 IJ17059 ** 2.2.6.50 key_w_apar NTPv4
3.1.0 IJ17059 ** 3.1.0.30 key_w_apar NTPv4
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IJ17060
http://www.ibm.com/support/docview.wss?uid=isg1IJ17061
http://www.ibm.com/support/docview.wss?uid=isg1IJ17062
http://www.ibm.com/support/docview.wss?uid=isg1IJ17063
http://www.ibm.com/support/docview.wss?uid=isg1IJ17064
http://www.ibm.com/support/docview.wss?uid=isg1IJ17065
http://www.ibm.com/support/docview.wss?uid=isg1IJ17059
https://www.ibm.com/support/docview.wss?uid=isg1IJ17060
https://www.ibm.com/support/docview.wss?uid=isg1IJ17061
https://www.ibm.com/support/docview.wss?uid=isg1IJ17062
https://www.ibm.com/support/docview.wss?uid=isg1IJ17063
https://www.ibm.com/support/docview.wss?uid=isg1IJ17064
https://www.ibm.com/support/docview.wss?uid=isg1IJ17065
https://www.ibm.com/support/docview.wss?uid=isg1IJ17059
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
AIX and VIOS fixes are available.
The AIX/VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix12.tar
http://aix.software.ibm.com/aix/efixes/security/ntp_fix12.tar
https://aix.software.ibm.com/aix/efixes/security/ntp_fix12.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.
For NTPv3:
AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
----------------------------------------------------------
7.1.4.6 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3
7.1.4.7 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3
7.1.4.8 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3
7.1.5.2 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3
7.1.5.3 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3
7.1.5.4 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3
7.2.1.4 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3
7.2.1.5 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3
7.2.1.6 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3
7.2.2.2 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3
7.2.2.3 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3
7.2.2.4 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3
7.2.3.1 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
7.2.3.2 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
7.2.3.3 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.2.2.2 is AIX 7200-02-02.
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
-----------------------------------------------------------
2.2.5.40 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.5.50 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.5.60 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.20 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.21 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.23 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.30 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.31 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.32 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.40 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
2.2.6.41 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3
3.1.0.0 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
3.1.0.10 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
3.1.0.20 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
3.1.0.21 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3
For NTPv4:
AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
----------------------------------------------------------
7.1.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4
7.2.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
-----------------------------------------------------------
2.2.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4
3.1.0.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4
To extract the fixes from the tar file:
tar xvf ntp_fix12.tar
cd ntp_fix12
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command as the following:
openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
5543f8cfe79e9b260b1ffd795f1e755d063564cb436e77b56ccf3c806378d2ca IJ17059m9b.190719.epkg.Z key_w_csum
fa9702b1406fd3b1437ac333f4a5a35cc8c8b6322a83970fbed6cf3f0ea73d5d IJ17060m9a.190628.epkg.Z key_w_csum
6b15b60f21f0a6e9506373ac5178aaf6a11e12a54087b27120614641222d0c48 IJ17061m8a.190628.epkg.Z key_w_csum
97e5c6ff951552e0b88a7ea61cf4b368844ae9d72721d923176f3c55b7340a0a IJ17062m4a.190628.epkg.Z key_w_csum
cd980f0e6ef7c69e5d1ad48eeb4bfc6f621a34747af28bf2c3e161e89fce251b IJ17063m6a.190701.epkg.Z key_w_csum
fa52c67254367424a611a269932b6de63c1d404ed9dd6cfa79eab465b91f11c6 IJ17064m4a.190701.epkg.Z key_w_csum
71bfbe4fb5697bc18d5a5d5524c9d64f08040aea04de765d1c1183c532006ef7 IJ17065m3a.190701.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 Support at
http://ibm.com/support/ 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/ntp_advisory12.asc.sig
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
If possible, it is recommended that a mksysb backup of the system
be created. Verify it is both bootable and readable before
proceeding.
The fix will not take affect until any running xntpd servers
have been stopped and restarted with the following commands:
stopsrc -s xntpd
startsrc -s xntpd
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.
After installation the ntp daemon must be restarted:
stopsrc -s xntpd
startsrc -s xntpd
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:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
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
Contact IBM Support for questions related to this announcement:
http://ibm.com/support/
https://ibm.com/support/
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt
Please contact your local IBM AIX support center for any
assistance.
REFERENCES:
Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide
On-line Calculator v3:
http://www.first.org/cvss/calculator/3.0
RELATED INFORMATION:
IBM Secure Engineering Web Portal
http://www.ibm.com/security/secure-engineering/bulletins.html
IBM Product Security Incident Response Blog
https://www.ibm.com/blogs/psirt/
Security Bulletin: Vulnerability in NTP affects AIX (CVE-2019-8936)
https://www-01.ibm.com/support/docview.wss?uid=ibm10961772
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Aug 19 16:44:22 CDT 2019
===============================================================================
*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.
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CVSS2
5
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.008
Percentile
82.2%
Related for NTP_ADVISORY12.ASC