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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2015.1878
Multiple Security vulnerabilities in AIX OpenSSL
16 July 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL
Publisher: IBM
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000 CVE-2015-1792 CVE-2015-1791
CVE-2015-1790 CVE-2015-1789 CVE-2015-1788
CVE-2014-8176
Reference: ESB-2015.1540
ESB-2015.1452
ESB-2015.1445
ESB-2015.1443
ESB-2015.1432
ESB-2015.1425
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc
- --------------------------BEGIN INCLUDED TEXT--------------------
IBM SECURITY ADVISORY
First Issued: Wed Jul 15 00:20:05 CDT 2015
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc
===============================================================================
VULNERABILITY SUMMARY
1. VULNERABILITY:A vulnerability in the TLS protocol allows a man-in-the-middle
attacker to downgrade vulnerable TLS connections using ephemeral
Diffie-Hellman key exchange to 512-bit export-grade cryptography.
This vulnerability is known as Logjam.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-4000
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
2.VULNERABILITY:When processing an ECParameters structure OpenSSL enters an infinite
loop if the curve specified is over a specially malformed binary
polynomial field.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-1788
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
3. VULNERABILITY:X509_cmp_time does not properly check the length of the ASN1_TIME
string and can read a few bytes out of bounds. In addition,
X509_cmp_time accepts an arbitrary number of fractional seconds in
the time string.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-1789
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
4. VULNERABILITY:The PKCS#7 parsing code does not handle missing inner EncryptedContent
correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs
with missing content and trigger a NULL pointer dereference on parsing.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-1790
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
5. VULNERABILITY:If a NewSessionTicket is received by a multi-threaded client when attempting
to reuse a previous ticket then a race condition can occur potentially leading
to a double free of the ticket data.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-1791
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
6. VULNERABILITY:When verifying a signedData message the CMS code can enter an infinite
loop if presented with an unknown hash function OID.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2015-1792
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
7. VULNERABILITY:If a DTLS peer receives application data between the ChangeCipherSpec
and Finished messages, buffering of such data may cause an invalid free,
resulting in a segmentation fault or potentially, memory corruption.
PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2014-8176
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
1. CVE-2015-4000
A vulnerability in the TLS protocol allows a man-in-the-middle attacker to
downgrade vulnerable TLS connections using ephemeral Diffie-Hellman key
exchange to 512-bit export-grade cryptography.This vulnerability is known
as Logjam.
2. CVE-2015-1788
When processing an ECParameters structure OpenSSL enters an infinite loop
if the curve specified is over a specially malformed binary polynomial field.
3. CVE-2015-1789
X509_cmp_time does not properly check the length of the ASN1_TIME string and
can read a few bytes out of bounds. In addition, X509_cmp_time accepts an
arbitrary number of fractional seconds in the time string.
4. CVE-2015-1790
The PKCS#7 parsing code does not handle missing inner EncryptedContent correctly.
An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content
and trigger a NULL pointer dereference on parsing.
5. CVE-2015-1791
If a NewSessionTicket is received by a multi-threaded client when attempting
to reuse a previous ticket then a race condition can occur potentially leading
to a double free of the ticket data.
6. CVE-2015-1792
When verifying a signedData message the CMS code can enter an infinite loop if
presented with an unknown hash function OID.
7. CVE-2014-8176
If a DTLS peer receives application data between the ChangeCipherSpec and Finished
messages, buffering of such data may cause an invalid free,resulting in a segmentation
fault or potentially, memory corruption.
II. CVSS
1. CVE-2015-4000
CVSS Base Score: 4.3
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103294
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
2. CVE-2015-1788
CVSS Base Score: 5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103778
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
3. CVE-2015-1789
CVSS Base Score: 5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103779
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
4. CVE-2015-1790
CVSS Base Score: 5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103780
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
5. CVE-2015-1791
CVSS Base Score: 5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103609
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
6. CVE-2015-1792
CVSS Base Score: 5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103781
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
7. CVE-2014-8176
CVSS Base Score: 6.5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/103782
CVSS Environmental Score*: Undefined
CVSS Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
III. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L openssl.base
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------
openssl.base 1.0.1.500 1.0.1.514
openssl.base 0.9.8.401 0.9.8.2505
openssl.base 12.9.8.1100 12.9.8.2505
Note, 0.9.8.401 and 12.9.8.1100 are the Lowest OpenSSL version
available in aix web download site. Even OpenSSL versions below
this are impacted
IV. SOLUTIONS
A. FIXES
Fix is available. The fix can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix14.tar
https://aix.software.ibm.com/aix/efixes/security/openssl_fix14.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
releases.
Note that the tar file contains Interim fixes that are based on OpenSSL version
as given below -
Note: You must be on the 'prereq for installation' level before applying the interim fix.
This may require installing a new level(prereq version) first.
AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation)
---------------------------------------------------------------------------------
5.3, 6.1, 7.1 IV74809s9a.150710.epkg.Z openssl.base(1.0.1.514 version)
5.3, 6.1, 7.1 IV74809s9b.150710.epkg.Z openssl.base(0.9.8.2505 version)
5.3, 6.1, 7.1 IV74809s9c.150710.epkg.Z openssl.base(12.9.8.2505 version)
VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation)
---------------------------------------------------------------------------------
2.2.* IV74809s9a.150710.epkg.Z openssl.base(1.0.1.514 version)
2.2.* IV74809s9b.150710.epkg.Z openssl.base(0.9.8.2505 version)
2.2.* IV74809s9c.150710.epkg.Z openssl.base(12.9.8.2505 version)
To extract the fix from the tar file:
tar xvf openssl_fix14.tar
cd openssl_fix14
Verify you have retrieved the fix intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command is the followng:
openssl dgst -sha256 filename
----------------------------------------------------------------------------------------------
d99db3c726bcc26cf8a7233725bc47125c15d68844d08a8ab598440d8a2912cf IV74809s9a.150710.epkg.Z
b33daadfecd61c2b0f03b3b9b87a3fcb3435a7aa52c29c18445f79579265bf67 IV74809s9b.150710.epkg.Z
b5a0396ad25278547da61349cdf008fc424836ed0c7087dbc0e554af86d8974f IV74809s9c.150710.epkg.Z
These sums should match exactly. The OpenSSL signatures in the tarfile
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
security-alert@austin.ibm.com and describe the discrepancy.
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory14.asc.sig
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
NOTE -
1.for CVE-2015-4000: As the length of the server default DH key group size has been increased
from 512 to 768 bits, the amount of CPU required for full TLS/SSL handshake can significantly
increase. Please carefully test and assess the impact to your CPU requirements to ensure
sufficient CPU resources, otherwise the system availability may be impacted.
2.For CVE-2015-4000: IBM recommends that you review your entire environment to identify
other areas where you have enabled the Diffie-Hellman key-exchange protocol used in TLS and
take appropriate mitigation and remediation actions.
B. 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.
V. WORKAROUNDS
No Workarounds.
VI. 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:
security-alert@austin.ibm.com
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 security-alert@austin.ibm.com 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.
VII. REFERENCES:
Note: Keywords labeled as KEY in this document are used for parsing purposes.
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
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
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103294
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103778
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103779
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103780
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103609
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103781
X-Force Vulnerability Database: https://exchange.xforce.ibmcloud.com/vulnerabilities/103782
CVE-2015-4000 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4000
CVE-2015-1788 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1788
CVE-2015-1789 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1789
CVE-2015-1790 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1790
CVE-2015-1791 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1791
CVE-2015-1792 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1792
CVE-2014-8176 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8176
*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 Flash.
Note: 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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