IBM SECURITY ADVISORY
First Issued: Fri Sep 4 05:15:17 CDT 2015
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc https://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc ftp://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc =============================================================================== VULNERABILITY SUMMARY
VULNERABILITY: AIX OpenSSH 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-2015-5352 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO
=============================================================================== DETAILED INFORMATION
CVE-2015-5352 A vulnerability in ssh when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window
1. CVE-2015-5352 CVSS Base Score:4.3 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/104418 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
III. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following command: lslpp -L openssh.base The following fileset levels are vulnerable: AIX Fileset Lower Level Upper Level KEY -------------------------------------------------------- openssh.base 18.104.22.16800 22.214.171.12400 key_w_fs
A. FIXES fix is available, and it can be downloaded from: https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp Fixed fileset version are OpenSSH_126.96.36.19910.tar.Z and OpenSSH_188.8.131.5201.tar.Z Refer to the Readme file for more details on the fileset. Note - OpenSSH releases 184.108.40.20610 and 220.127.116.1101 are same except that 18.104.22.16801 is compiled with OpenSSL v1.0.1 and contains ECDSA key support. To extract the fixes from the tar file: zcat OpenSSH_22.214.171.12410.tar.Z | tar xvf - (or) zcat OpenSSH_126.96.36.19901.tar.Z | tar xvf - 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 the fix installation: installp -apYd . OpenSSH_188.8.131.5210 (or) installp -apYd . OpenSSH_184.108.40.20601 To install the fix package: installp -aXYd . OpenSSH_220.127.116.1110 (or) installp -aXYd . OpenSSH_18.104.22.16801
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: email@example.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 firstname.lastname@example.org 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.
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/104418 CVE-2015-5352 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5352 *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.