IBM SECURITY ADVISORY First Issued: Fri Nov 14 03:31:13 PM CST 2014 | Updated: Mon Dec 01 10:21:50 AM CST 2014 | Update: Fileset name incorrect in lslpp command The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc https://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc =============================================================================== VULNERABILITY SUMMARY 1.VULNERABILITY: Open Source RSyslog vulnerability 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-2014-3634 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 2. VULNERABILITY: AIX OpenSSL DTLS recursion flaw 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-2014-3683 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION 1. CVE-2014-3634 RSyslog is vulnerable to a denial of service. By sending a specially-crafted message, a remote attacker could exploit this vulnerability to cause the service to crash. 2. CVE-2014-3683 RSyslog is vulnerable to a denial of service, caused by an incomplete fix related to an integer overflow when parsing PRI. By sending a specially-crafted message, a remote attacker could exploit this vulnerability to cause the service to crash. II. CVSS 1. CVE-2014-3634 CVSS Base Score: 5.0 CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/96794 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 2. CVE-2014-3683 CVSS Base Score: 5.0 CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/96835 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) III. PLATFORM VULNERABILITY ASSESSMENT To determine if your system is vulnerable, execute the following command: | lslpp -L |grep rsyslog.base The following fileset levels are vulnerable: A. CVE-2014-3634 AIX Fileset Lower Level Upper Level ------------------------------------------ rsyslog.base 5.8.6.1 5.8.6.3 B. CVE-2014-3683 AIX Fileset Lower Level Upper Level ------------------------------------------ rsyslog.base 5.8.6.1 5.8.6.3 IV. SOLUTIONS A. FIXES Fix is available. The fix can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/rsyslog_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 releases. Note that the tar file contains Interim fixes that are based on RSyslog version. AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) --------------------------------------------------------------------------------- 5.3, 6.1, 7.1 IV66633s0a.141107.epkg.Z rsyslog.base(5.8.6.3 version) VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) ------------------------------------------------------------------------------------- 2.2.* IV66633s0a.141107.epkg.Z rsyslog.base(5.8.6.3 version) To extract the fix from the tar file: tar xvf rsyslog_fix.tar cd rsyslog_fix 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 ---------------------------------------------------------------------------------------------- a2406c9f30168361ece853196e6297511e6d9d6911af1a2944124c652d898771 IV66633s0a.141107.epkg.Z 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. Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/rsyslog_advisory.asc.sig openssl dgst -sha1 -verify -signature .sig openssl dgst -sha1 -verify -signature .sig These fixes will also be part of the next filesets of rsyslog version 5.8.6.4. The estimated availability date of filesets is by 5th December 2014 and can be downloaded from - https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=Rsyslog&cp=UTF-8 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 INFORMATION If you would like to receive AIX Security Advisories via email, please visit: http://www.ibm.com/systems/support and click on the "My notifications" link. 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_pgpkey.txt To obtain the PGP public key that can be used to communicate securely with the AIX Security Team you can either: A. Send an email with "get key" in the subject line to: security-alert@austin.ibm.com 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: http://xforce.iss.net/xforce/xfdb/96794 X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/96835 CVE-2014-3634 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3634 CVE-2014-3683 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3683 *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.