IBM SECURITY ADVISORY First Issued: Mon Jan 18 10:47:32 CST 2016 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc https://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc Security Bulletin: Vulnerabilities in OpenSSL affect AIX CVE-2015-3194 CVE-2015-3195 CVE-2015-3196 =============================================================================== SUMMARY: There are multiple vulnerabilities in OpenSSL that impact AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2015-3194 DESCRIPTION: OpenSSL allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an RSA PSS ASN.1 signature that lacks a mask generation function parameter. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/108503 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) CVEID: CVE-2015-3195 DESCRIPTION: The ASN1_TFLG_COMBINE implementation in OpenSSL mishandles errors caused by malformed X509_ATTRIBUTE data, which allows remote attackers to obtain sensitive information from process memory by triggering a decoding failure in a PKCS#7 or CMS application. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/108504 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N) CVEID: CVE-2015-3196 DESCRIPTION: OpenSSL when used for a multi-threaded client, writes the PSK identity hint to an incorrect data structure, which allows remote servers to cause a denial of service (race condition and double free) via a crafted ServerKeyExchange message. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/108505 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P) 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 = osrcaix A. CVE-2015-3194, CVE-2015-3196 Fileset Lower Level Upper Level KEY -------------------------------------------------- openssl.base 1.0.1.500 1.0.1.515 key_w_fs B. CVE-2015-3195 Fileset Lower Level Upper Level KEY -------------------------------------------------- openssl.base 1.0.1.500 1.0.1.515 key_w_fs openssl.base 0.9.8.401 0.9.8.2506 key_w_fs openssl.base 12.9.8.1100 12.9.8.2506 key_w_fs 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 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 openssl.base REMEDIATION: A. FIXES Fixes are available. The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix15.tar http://aix.software.ibm.com/aix/efixes/security/openssl_fix15.tar https://aix.software.ibm.com/aix/efixes/security/openssl_fix15.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. Note that the tar file contains Interim fixes that are based on OpenSSL version. AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY -------------------------------------------------------------------------------------------- 5.3, 6.1, 7.1, 7.2 101_ifix.151218.epkg.Z openssl.base(1.0.1.515 version) key_w_fix 5.3, 6.1, 7.1, 7.2 098_ifix.151218.epkg.Z openssl.base(0.9.8.2506 version) key_w_fix 5.3, 6.1, 7.1, 7.2 1298_ifix.151218.epkg.Z openssl.base(12.9.8.2506 version) key_w_fix VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY -------------------------------------------------------------------------------------------- 2.2.* 101_ifix.151218.epkg.Z openssl.base(1.0.1.515 version) key_w_fix 2.2.* 098_ifix.151218.epkg.Z openssl.base(0.9.8.2506 version) key_w_fix 2.2.* 1298_ifix.151218.epkg.Z openssl.base(12.9.8.2506 version) key_w_fix To extract the fixes from the tar file: tar xvf openssl_fix15.tar cd openssl_fix15 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command as the followng: openssl dgst -sha256 filename KEY ---------------------------------------------------------------------------------------------------- b65b7ce60380ac988767dd4319002ceb82c18d4786f8d6de014b58028f8bf847 101_ifix.151218.epkg.Z key_w_csum 0fb34df46591a4c4ff9c468e75da2e9c0a7541f3a0cda325c2fe28df1baa0571 098_ifix.151218.epkg.Z key_w_csum d820d31b37fb9ffb51abdd504066f6a752fb0b8d83d305a6b7f4267161d5cf61 1298_ifix.151218.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 security-alert@austin.ibm.com and describe the discrepancy. openssl dgst -sha1 -verify -signature .sig openssl dgst -sha1 -verify -signature .sig Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig https://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig 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. 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 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. 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 Jan 18 10:47:32 CST 2016 =============================================================================== *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.