9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
There is a vulnerability in NTPv4 that affects AIX.
NTPv4 is vulnerable to:
CVEID: CVE-2018-12327 DESCRIPTION: NTP is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by ntpq and ntpdc. By sending an overly long string argument, a local attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges or cause the application to crash.
CVSS Base Score: 5.9
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/145120> for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2018-7170 DESCRIPTION: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by a Sybil attack. By creating many ephemeral associations, an attacker could exploit this vulnerability to win the clock selection of ntpd and modify a victim’s clock.
CVSS Base Score: 3.1
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/139786> 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:L/A:N)
AIX 6.1, 7.1, 7.2
VIOS 2.2.x
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
For NTPv4:
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
ntp.rte 7.4.2.8100 7.4.2.8110 key_w_fs
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
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_fix11.tar
http://aix.software.ibm.com/aix/efixes/security/ntp_fix11.tar
https://aix.software.ibm.com/aix/efixes/security/ntp_fix11.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 NTPv4:
AIX Level Interim Fix (*.Z) KEY
----------------------------------------------
6.1.x IJ10280s3b.181206.epkg.Z key_w_fix
7.1.x IJ10280s3b.181206.epkg.Z key_w_fix
7.2.x IJ10280s3b.181206.epkg.Z key_w_fix
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
2.2.x IJ10280s3b.181206.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf ntp_fix11.tar
cd ntp_fix11
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
-----------------------------------------------------------------------------------------------------
000891c62f5e59c34909399d0ef4c74c72048a4fc1e7e50b66dedaa4fcf0ee87 IJ10280s3b.181206.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_advisory11.asc.sig
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc.sig
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
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
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
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
None.
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P