Summary

There is a vulnerability in Oracle Solaris that affects AIX.

Vulnerability Details

CVEID: CVE-2017-3623 DESCRIPTION: An unspecified vulnerability in Oracle Sun Systems related to the Solaris Kernel RPC component could allow an unauthenticated attacker to take control of the system.
CVSS Base Score: 10
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/124996&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

AIX 5.3, 6.1, 7.1, 7.2
VIOS 2.2.x

The following fileset levels are vulnerable:

key_fileset = aix

Fileset Lower Level Upper Level KEY
---------------------------------------------------------
bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs
bos.net.tcp.client 6.1.9.0 6.1.9.400 key_w_fs
bos.net.tcp.client 7.1.4.0 7.1.4.33 key_w_fs
bos.net.tcp.client 7.1.5.0 7.1.5.30 key_w_fs
bos.net.tcp.client_core 7.2.0.0 7.2.0.5 key_w_fs
bos.net.tcp.client_core 7.2.1.0 7.2.1.3 key_w_fs
bos.net.tcp.client_core 7.2.2.0 7.2.2.16 key_w_fs
bos.net.tcp.client_core 7.2.3.0 7.2.3.0 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 bos.net.tcp.client

Remediation/Fixes

A. APARS

IBM has assigned the following APARs to this problem:

AIX Level APAR Availability SP KEY
-----------------------------------------------------
5.3.12 IJ10554 ** N/A key_w_apar
6.1.9 IJ10134 ** SP12-1846 key_w_apar
7.1.4 IJ10275 ** SP07-1845 key_w_apar
7.1.5 IJ10132 ** SP03-1846 key_w_apar
7.2.0 IJ10553 ** N/A key_w_apar
7.2.1 IJ10552 ** SP05-1845 key_w_apar
7.2.2 IJ10130 ** SP03-1845 key_w_apar
7.2.3 IJ09805 ** SP02-1845 key_w_apar

VIOS Level APAR Availability SP KEY
----------------------------------------------------
2.2.4 IJ10134 ** N/A key_w_apar
2.2.5 IJ10134 ** 2.2.5.50 key_w_apar
2.2.6 IJ10134 ** 2.2.6.32 key_w_apar

Subscribe to the APARs here:

http://www.ibm.com/support/docview.wss?uid=isg1IJ10554
http://www.ibm.com/support/docview.wss?uid=isg1IJ10134
http://www.ibm.com/support/docview.wss?uid=isg1IJ10275
http://www.ibm.com/support/docview.wss?uid=isg1IJ10132
http://www.ibm.com/support/docview.wss?uid=isg1IJ10553
http://www.ibm.com/support/docview.wss?uid=isg1IJ10552
http://www.ibm.com/support/docview.wss?uid=isg1IJ10130
http://www.ibm.com/support/docview.wss?uid=isg1IJ09805

https://www.ibm.com/support/docview.wss?uid=isg1IJ10554
https://www.ibm.com/support/docview.wss?uid=isg1IJ10134
https://www.ibm.com/support/docview.wss?uid=isg1IJ10275
https://www.ibm.com/support/docview.wss?uid=isg1IJ10132
https://www.ibm.com/support/docview.wss?uid=isg1IJ10553
https://www.ibm.com/support/docview.wss?uid=isg1IJ10552
https://www.ibm.com/support/docview.wss?uid=isg1IJ10130
https://www.ibm.com/support/docview.wss?uid=isg1IJ09805

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.

After iFix installation, an LPAR system reboot is recommended. In lieu of a reboot, processes using RPC services may be stopped and restarted. Please refer to the rpcinfo command to view running RPC services. Programs/daemons running those RPC services must be restarted.

The AIX and VIOS fixes can be downloaded via ftp or http from:

ftp://aix.software.ibm.com/aix/efixes/security/solaris_fix.tar
http://aix.software.ibm.com/aix/efixes/security/solaris_fix.tar
https://aix.software.ibm.com/aix/efixes/security/solaris_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
----------------------------------------------
5.3.12.9 IJ10554s9a.181017.epkg.Z key_w_fix
6.1.9.10 IJ10134sAa.181009.epkg.Z key_w_fix
6.1.9.11 IJ10134sBa.181009.epkg.Z key_w_fix
6.1.9.11 IJ10134sBb.181009.epkg.Z key_w_fix
6.1.9.12 IJ10134sCa.181009.epkg.Z key_w_fix
7.1.4.4 IJ10275s4a.181009.epkg.Z key_w_fix
7.1.4.5 IJ10275s5a.181009.epkg.Z key_w_fix
7.1.4.6 IJ10275s6a.181009.epkg.Z key_w_fix
7.1.5.1 IJ10132s1a.181009.epkg.Z key_w_fix
7.1.5.2 IJ10132s2a.181009.epkg.Z key_w_fix
7.1.5.2 IJ10132s2b.181009.epkg.Z key_w_fix
7.1.5.3 IJ10132s3a.181009.epkg.Z key_w_fix
7.2.0.4 IJ10553s4a.181016.epkg.Z key_w_fix
7.2.0.5 IJ10553s5a.181016.epkg.Z key_w_fix
7.2.0.6 IJ10553s6a.181016.epkg.Z key_w_fix
7.2.1.2 IJ10552s2a.181016.epkg.Z key_w_fix
7.2.1.3 IJ10552s3a.181016.epkg.Z key_w_fix
7.2.1.4 IJ10552s4a.181016.epkg.Z key_w_fix
7.2.2.0 IJ10130s0a.181011.epkg.Z key_w_fix
7.2.2.1 IJ10130s0a.181011.epkg.Z key_w_fix
7.2.2.2 IJ10130s2a.181011.epkg.Z key_w_fix
7.2.2.2 IJ10130s2b.181011.epkg.Z key_w_fix
7.2.3.0 IJ09805s0a.181012.epkg.Z key_w_fix
7.2.3.1 IJ09805s0a.181012.epkg.Z key_w_fix

Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.1 is AIX 7200-02-01.

NOTE: Multiple iFixes are provided for AIX 6100-09-11, 7100-05-02, and 7200-02-02.
IJ10134sBa is for AIX 6100-09-11 with bos.net.tcp.client fileset level 6.1.9.315.
IJ10134sBb is for AIX 6100-09-11 with bos.net.tcp.client fileset level 6.1.9.316.
IJ10132s2a is for AIX 7100-05-02 with bos.net.tcp.client fileset level 7.1.5.15.
IJ10132s2b is for AIX 7100-05-02 with bos.net.tcp.client fileset level 7.1.5.16.
IJ10130s2a is for AIX 7200-02-02 with bos.net.tcp.client_core fileset level 7.2.2.15.
IJ10130s2b is for AIX 7200-02-02 with bos.net.tcp.client_core fileset level 7.2.2.16.

Please reference the Affected Products and Version section above for help with checking installed fileset levels.

VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
2.2.4.60 IJ10134sBa.181009.epkg.Z key_w_fix
2.2.5.40 IJ10134sBa.181009.epkg.Z key_w_fix
2.2.6.20 IJ10134sBa.181009.epkg.Z key_w_fix
2.2.6.21 IJ10134sBa.181009.epkg.Z key_w_fix
2.2.6.23 IJ10134sBb.181009.epkg.Z key_w_fix
2.2.6.30 IJ10134sCa.181009.epkg.Z key_w_fix
2.2.6.31 IJ10134sCa.181009.epkg.Z key_w_fix

To extract the fixes from the tar file:

tar xvf solaris_fix.tar
cd solaris_fix

Verify you have retrieved the fixes intact:

The checksums below were generated using the “openssl dgst -sha256 [filename]” command as the following:

openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
3361de83cc5cd752a4633f6363ef67c80d179740e65fb7e4ed69581daba2ba8e IJ09805s0a.181012.epkg.Z key_w_csum
561c4f14440c4bbc67cd9ddf71d16c04f75b2bdb8de5ef7a365f7c67ac180dba IJ10130s0a.181011.epkg.Z key_w_csum
3a8b2e9a4060212a3cf2d4b5d462605e2ac073a6434b623c19c7634b61a51e06 IJ10130s2a.181011.epkg.Z key_w_csum
befbe84cd8bcdfd8a4c56a6e543721be85ea9bd66893f13996b4cefc75fa6f8e IJ10130s2b.181011.epkg.Z key_w_csum
47991453c69e353822dfc10035c3370d422853d491aeeb1062dc5c9e196a077f IJ10132s1a.181009.epkg.Z key_w_csum
354c03e24a648acfe7fb8516fa043b1fcfe1b2739188eb85b3973673e50a0d39 IJ10132s2a.181009.epkg.Z key_w_csum
a72972107ceb3e6fa1408d7c3e3277b2926d9f6c62cb2100de2b8fe6678aa738 IJ10132s2b.181009.epkg.Z key_w_csum
8517c019727df9fb65ad59d0f51bdc9c550e4f3c1b2cd0f9ffe9f8eee46a514a IJ10132s3a.181009.epkg.Z key_w_csum
dea142ac623e9a54fe36ba4d5ffe1e3a472c1071603864c2b8a15a938e2f8e8f IJ10134sAa.181009.epkg.Z key_w_csum
a7bc11276427338eaa3eb399c7c8b44189911f7dff17f86e82c754cb79574934 IJ10134sBa.181009.epkg.Z key_w_csum
f3a0758fdf91d710dac3c8ebc899ec41d2321ac5ffba8bbf3f8671c9874771da IJ10134sBb.181009.epkg.Z key_w_csum
168868a77bddb52b210b1c8b0122cbad0f42b31a3917f79b5f9eb227825cf004 IJ10134sCa.181009.epkg.Z key_w_csum
7ccc5910e339cc5266419dbba50342b25577a9bb97982cc6d04e841226b37bad IJ10275s4a.181009.epkg.Z key_w_csum
f11f3f359f6b685463fbbbc83ae698157ab76b825567f125bb007e079bd83867 IJ10275s5a.181009.epkg.Z key_w_csum
7f27c0f0f6cc3d6674a5618d690dbb30013da5e172305a9d01440437abaf74c7 IJ10275s6a.181009.epkg.Z key_w_csum
7ff683e5284d686ea8f52fb5d895ba0b3303de6a33552e5855d2ea8a284ef6fa IJ10552s2a.181016.epkg.Z key_w_csum
9747cef73298ba097e9256fb00cc3babac83f4d2628888798a0cfa140cc354fa IJ10552s3a.181016.epkg.Z key_w_csum
8fa9f4c5ab555ab3a348a8effa1938b53857a1c334e53ab359f43e8fff85429b IJ10552s4a.181016.epkg.Z key_w_csum
ba67396c66996de2a52610bdf7bb44ad28cd4eb97345c62d6e11787e56cbab7e IJ10553s4a.181016.epkg.Z key_w_csum
e9b817c683b27e09233086fff50f6d7bec635d9617975dfb20b5d4ee65feed58 IJ10553s5a.181016.epkg.Z key_w_csum
6bb35b3a311479b8f72813d90ca441b11af929268e42aec9d52906f618d2b76d IJ10553s6a.181016.epkg.Z key_w_csum
40d3f722f63b2f315f81f530b48869714a86a7c25653d339c7fc6aba59235e5e IJ10554s9a.181017.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/solaris_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/solaris_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/solaris_advisory.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.

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

A fix is not required if RPC services are not running. You can check for running RPC services with the “rpcinfo -p” command.

If there are RPC services running that are not required to run, you can do the following to stop RPC services:

1. Comment out the rc.nfs line in /etc/inittab (To comment in this file, use colon space at the beginning of the line, ": ")

$ vim /etc/inittab

…

: rcnfs:23456789:wait:/etc/rc.nfs > /dev/console 2>&1 # Start NFS Daemons

…

2. Comment out the lines that start portmap in /etc/rc.tcpip

$ vim /etc/rc.tcpip

…

portmap_pid=ps -e | awk '$NF == "portmap" {print $1}'

[ -z “$portmap_pid” ] && start /usr/sbin/portmap “${src_running}”

…

3. Reboot