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aixCentOS ProjectRC4_ADVISORY.ASC
HistoryApr 27, 2015 - 3:27 p.m.

Vulnerability in RC4 stream cipher affects AIX,Vulnerability in RC4 stream cipher affects ftpd/sendmail_ssl/imapd/popd on AIX,Vulnerability in RC4 stream cipher affects ftpd/sendmail_ssl/imapd/popd on VIOS

2015-04-2715:27:04
CentOS Project
aix.software.ibm.com
793

0.003 Low

EPSS

Percentile

69.5%

IBM SECURITY ADVISORY

First Issued: Mon Apr 27 15:27:04 CDT 2015
| Updated: Tue Dec 15 11:54:19 CST 2015
| Update: Added all information for ftpd, sendmail_ssl, imapd, and popd

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/rc4_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/rc4_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/rc4_advisory.asc

Security Bulletin: Vulnerability in RC4 stream cipher
affects AIX (CVE-2015-2808)

===============================================================================

SUMMARY:

The RC4 .Bar Mitzvah. Attack for SSL/TLS affects IBM Tivoli/Security 

| Directory Server, IBM SDK for Java, IBM SDK for Node.js, ftpd, sendmail
| when using the sendmail_ssl binary, imapd, and popd on AIX.

===============================================================================

VULNERABILITY DETAILS:

CVEID: CVE-2015-2808
    https://vulners.com/cve/CVE-2015-2808


DESCRIPTION:

    The RC4 algorithm, as used in the TLS protocol and SSL protocol, 
    could allow a remote attacker to obtain sensitive information. An 
    attacker could exploit this vulnerability to remotely expose account 
    credentials without requiring an active man-in-the-middle session. 
    Successful exploitation could allow an attacker to retrieve credit 
    card data or other sensitive information. This vulnerability is 
    commonly referred to as "Bar Mitzvah Attack".


CVSS:

    CVSS Base Score: 5
    CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the 
    current score
    CVSS Environmental Score*: Undefined
    CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 5.3, 6.1, 7.1
    VIOS 2.2.x

| The following versions of IBM Tivoli Directory Server and IBM
| Security Directory Server are vulnerable:
| IBM Tivoli Directory Server 6.0, 6.1, 6.2, 6.3
| IBM Security Directory Server 6.3.1, 6.4

| Note: to find out whether the affected IBM Tivoli Directory
| Server and IBM Security Directory Server are installed on your
| systes, use the following command:

| /usr/bin/ibmslapd -v

    The following versions of IBM SDK for Node.js are vulnerable:
    IBM SDK for Node.js v1.1.0.13 and previous releases.


    The following fileset levels (VRMF) are vulnerable, if the 
    respective Java version is installed:
    For Java5:  Less than or equal to 5.0.0.590
    For Java6:  Less than or equal to 6.0.0.470
    For Java7:  Less than or equal to 7.0.0.195
    For Java7.1:  Less than or equal to 7.1.0.75

    Note:  to find out whether the affected Java filesets are installed 
    on your systems, refer to the lslpp command found in AIX user's guide.

    Example:  lslpp -L | grep -i java

| The following fileset levels are vulnerable:

AIX Fileset Lower Level Upper Level KEY
bos.net.tcp.client 6.1.0.0 6.1.8.19 key_w_fs
bos.net.tcp.client 6.1.0.0 6.1.9.45 key_w_fs
bos.net.tcp.client 7.1.0.0 7.1.2.19 key_w_fs
bos.net.tcp.client 7.1.0.0 7.1.3.45 key_w_fs

| bos.net.tcp.server 6.1.0.0 6.1.8.18 key_w_fs
| bos.net.tcp.server 6.1.0.0 6.1.9.45 key_w_fs
| bos.net.tcp.server 7.1.0.0 7.1.2.18 key_w_fs
| bos.net.tcp.server 7.1.0.0 7.1.3.45 key_w_fs

AIX Fileset (VIOS) Lower Level Upper Level
bos.net.tcp.client 6.1.0.0(2.2.0.0) 6.1.8.19(2.2.2.6)
bos.net.tcp.client 6.1.0.0(2.2.0.0) 6.1.9.48(2.2.3.50)

| bos.net.tcp.server 6.1.0.0(2.2.0.0) 6.1.8.18(2.2.2.6)
| bos.net.tcp.server 6.1.0.0(2.2.0.0) 6.1.9.45(2.2.3.50)

| 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 bos.net.tcp.client

REMEDIATION:

    IBM SDK for Java (see Workarounds and Mitigations for Java 7.0 and 7.1 
    releases):
        IBM SDK, Java Technology Edition, Version 5.0 Service Refresh 16 
        Fix Pack 9 and later:
32-bit: https://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&product=ibm/IBM+SDKs+for+Java+Technology/Java+Standard+Edition+%28Java+SE%29&release=5.0.0.0&platform=AIX+32-bit,+pSeries&function=all
64-bit: https://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&product=ibm/IBM+SDKs+for+Java+Technology/Java+Standard+Edition+%28Java+SE%29&release=5.0.0.0&platform=AIX+64-bit,+pSeries&function=all

        IBM SDK, Java Technology Edition, Version 6 Service Refresh 16 Fix 
        Pack 3 and later:
32-bit: https://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&product=ibm/IBM+SDKs+for+Java+Technology/Java+Standard+Edition+%28Java+SE%29&release=6.0.0.0&platform=AIX+32-bit,+pSeries&function=all
64-bit: https://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&product=ibm/IBM+SDKs+for+Java+Technology/Java+Standard+Edition+%28Java+SE%29&release=6.0.0.0&platform=AIX+64-bit,+pSeries&function=all


    IBM SDK for Node.js:
        IBM SDK for Node.js, v1.1.0.14 and later:
        http://www.ibm.com/developerworks/web/nodesdk/

| IBM Tivoli/Security Directory Server:
| Please see:
| https://www-01.ibm.com/support/docview.wss?uid=swg21883604

| A. APARS

| IBM has assigned the following APARs to this problem:

| For ftpd:

AIX Level APAR Availability SP KEY PRODUCT(S)
6.1.8 IV74915 9/30/15 SP7 key_w_apar ftpd
6.1.9 IV74916 12/04/15 SP6 key_w_apar ftpd
7.1.2 IV74917 9/30/15 SP7 key_w_apar ftpd
7.1.3 IV74458 2/26/16 SP6 key_w_apar ftpd

| Subscribe to the APARs here:

| http://www.ibm.com/support/docview.wss?uid=isg1IV74458
| http://www.ibm.com/support/docview.wss?uid=isg1IV74915
| http://www.ibm.com/support/docview.wss?uid=isg1IV74916
| http://www.ibm.com/support/docview.wss?uid=isg1IV74917

| For sendmail:
| Please note that these only apply to the SSL-enabled
| sendmail binary, /usr/sbin/sendmail_ssl.

AIX Level APAR Availability SP KEY PRODUCT(S)
6.1.8 IV74919 9/30/15 SP7 key_w_apar sendmail
6.1.9 IV74920 12/04/15 SP6 key_w_apar sendmail
7.1.2 IV74921 9/30/15 SP7 key_w_apar sendmail
7.1.3 IV74922 2/26/16 SP6 key_w_apar sendmail

| Subscribe to the APARs here:

| http://www.ibm.com/support/docview.wss?uid=isg1IV74919
| http://www.ibm.com/support/docview.wss?uid=isg1IV74920
| http://www.ibm.com/support/docview.wss?uid=isg1IV74921
| http://www.ibm.com/support/docview.wss?uid=isg1IV74922

| For imapd and popd:

AIX Level APAR Availability SP KEY PRODUCT(S)
6.1.8 IV74926 9/30/15 SP7 key_w_apar imapd/popd
6.1.9 IV74927 12/04/15 SP6 key_w_apar imapd/popd
7.1.2 IV74928 9/30/15 SP7 key_w_apar imapd/popd
7.1.3 IV74929 2/26/16 SP6 key_w_apar imapd/popd

| Subscribe to the APARs here:

| http://www.ibm.com/support/docview.wss?uid=isg1IV74926
| http://www.ibm.com/support/docview.wss?uid=isg1IV74927
| http://www.ibm.com/support/docview.wss?uid=isg1IV74928
| http://www.ibm.com/support/docview.wss?uid=isg1IV74929

| 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/rc4_fix.tar
| http://aix.software.ibm.com/aix/efixes/security/rc4_fix.tar
| https://aix.software.ibm.com/aix/efixes/security/rc4_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.

| For ftpd:

AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
6.1.8.6 IV74915m6a.150727.epkg.Z key_w_fix ftpd
6.1.9.5 IV74916m5a.150727.epkg.Z key_w_fix ftpd
7.1.2.6 IV74917m6a.150727.epkg.Z key_w_fix ftpd
7.1.3.5 IV74458m5a.150727.epkg.Z key_w_fix ftpd
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
2.2.2.6 IV74915m6a.150727.epkg.Z key_w_fix ftpd
2.2.3.50 IV74916m5a.150727.epkg.Z key_w_fix ftpd

| For sendmail:
| Please note that these only apply to the SSL-enabled
| sendmail binary, /usr/sbin/sendmail_ssl.

AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
6.1.8.6 IV74919m6a.150713.epkg.Z key_w_fix sendmail
6.1.9.5 IV74920m5a.150713.epkg.Z key_w_fix sendmail
7.1.2.6 IV74921m6a.150713.epkg.Z key_w_fix sendmail
7.1.3.5 IV74922m5a.150713.epkg.Z key_w_fix sendmail
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
2.2.2.6 IV74919m6a.150713.epkg.Z key_w_fix sendmail
2.2.3.50 IV74920m5a.150713.epkg.Z key_w_fix sendmail

| For imapd and popd:

AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
6.1.8.6 IV74926m6a.150711.epkg.Z key_w_fix imapd/popd
6.1.9.5 IV74927m5a.150711.epkg.Z key_w_fix imapd/popd
7.1.2.6 IV74928m6a.150710.epkg.Z key_w_fix imapd/popd
7.1.3.5 IV74929m5a.150711.epkg.Z key_w_fix imapd/popd
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
2.2.2.6 IV74926m6a.150711.epkg.Z key_w_fix imapd/popd
2.2.3.50 IV74927m5a.150711.epkg.Z key_w_fix imapd/popd

| To extract the fixes from the tar file:

| tar xvf rc4_fix.tar
| cd rc4_fix

| Verify you have retrieved the fixes intact:

| The checksums below were generated using the
| “openssl dgst -sha256 file” command as the followng:

| For ftpd:

openssl dgst -sha256 filename KEY
c1543420724f37165dfbe745408d82ac78b06d7a790b3f58333cd7e69ae6774c IV74915m6a.150727.epkg.Z key_w_csum
bb0d0d24aa68dfdc5ac53a1db9b658715a5c5bec7fab677b58310c2883699017 IV74916m5a.150727.epkg.Z key_w_csum
acbd7f5345d045d0aebad3530203529273cd441c7c1d47ceef7df640ab0e7810 IV74917m6a.150727.epkg.Z key_w_csum
7115f3e89496a14ddf014d1a628dc061dfd2eb101672a745f272bbc2b6e58665 IV74458m5a.150727.epkg.Z key_w_csum

| For sendmail:

openssl dgst -sha256 filename KEY
243685a7a79c21a6536ddb0bc876b0574ece6c1cabde5c1a20a6d8e7ac853ece IV74919m6a.150713.epkg.Z key_w_csum
d23438abe8c731fa16b4743dc43520495ebb14b2bc59fd1a6f94f33c91a2da1c IV74920m5a.150713.epkg.Z key_w_csum
259f34fecb2e97bd7ab794aba4cd7a31aa1cc2507fd06daa983da959f5d02826 IV74921m6a.150713.epkg.Z key_w_csum
5fb08f96e8f0efec5f6c8e78644a95999b58025a09fc23729f35a4c1c58fcf55 IV74922m5a.150713.epkg.Z key_w_csum

| For imapd and popd:

openssl dgst -sha256 filename KEY
c358d14907aa573228a99323d8a96a50ad5b221a5a18d3193de5d3b9d4e41c1f IV74926m6a.150711.epkg.Z key_w_csum
9ac9f6867b5fc16f7efd8700dc367bd135c41e3a33014fe6191f0f79523817ea IV74927m5a.150711.epkg.Z key_w_csum
30850104c99159010858d4e0f2953d1904bd6b20364698187e7092e16fca44a4 IV74928m6a.150710.epkg.Z key_w_csum
15b68fb4e9cc11362f021eb6a08b380e6d7b68cf85ca67b273b1f4d09b2c3b8d IV74929m5a.150711.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/rc4_advisory.asc.sig
| https://aix.software.ibm.com/aix/efixes/security/rc4_advisory.asc.sig
| ftp://aix.software.ibm.com/aix/efixes/security/rc4_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.

    You should verify applying these fixes do not cause any 
    compatibility issues. The fix disables RC4 stream cipher by default. 
    If you change this setting you will expose yourself to the attack 
    described above. IBM recommends that you review your entire 
    environment to identify other areas where you have enabled the RC4 
    stream cipher and take appropriate mitigation and remediation actions.


WORKAROUNDS AND MITIGATIONS:

    For Java 7.0 and 7.1:  
    1. Disabling RC4. The can be achieved by adding RC4 to the list of 
        disabled algorithms defined by the jdk.tls.disabledAlgorithms
        security property in java.security file.
    2. Not explicit enabling the RC4 cipher suite(s).
    3. For HttpsURLConnection, set https.cipherSuites system property to 
        not include RC4 cipher suites.
    4. Configure to be in FIPS 140-2, Suite B or SP800-131a transition or 
        strict compliance 

    You should verify applying this configuration change does not cause 
    any compatibility issues. Not disabling the RC4 stream cipher will 
    expose yourself to the attack described above. IBM recommends that 
    you review your entire environment to identify other areas where you 
    have enabled the RC4 stream cipher and take appropriate mitigation 
    and remediation actions. 

===============================================================================

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 Apr 27 15:27:04 CDT 2015
Updated: Wed Apr 29 08:34:13 CDT 2015
Update: Clarified that IBM Tivoli/Security Directory Server on AIX is
vulnerable.

| Updated: Tue Dec 15 11:54:19 CST 2015
| Update: Added all information for ftpd, sendmail_ssl, imapd, and popd

===============================================================================

*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.