Security Bulletin: GNU C library (glibc) vulnerability affects IBM Storwize V7000 Unified (CVE-2015-7547)
IBM Storwize V7000 Unified is shipped with GNU glibc, for which a fix is available for a security vulnerability.
A GNU C library (glibc) stack-based buffer overflow in getaddrinfo() vulnerability affects IBM Storwize V7000 Unified.
DESCRIPTION: GNU C Library (glibc) is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the nss_dns backend for the getaddrinfo() function when performing dual A/AAAA DNS queries. By sending a specially crafted DNS response, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
CVSS Base Score: 8.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110662 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
IBM Storwize V7000 Unified
The product is affected when running code releases 184.108.40.206 to 220.127.116.11 and 18.104.22.168 to 22.214.171.124
A fix for these issues is in version 126.96.36.199 and 188.8.131.52 of IBM Storwize V7000 Unified. Customers running an affected version of IBM Storwize V7000 Unified should upgrade to 184.108.40.206 or 220.127.116.11 or a later version, so that the fix gets applied.
Latest Storwize V7000 Unified Software
Once updates have been applied, any process using glibc will need to be restarted. During upgrade, system nodes of IBM Storwize V7000 Unified are rebooted.
IBM recommends that you review your entire environment to identify vulnerable releases of glibc including your Operating Systems and take appropriate mitigation and remediation actions. Please contact your Operating System provider for more information.
Workarounds and Mitigations
Mitigation(s) : Although IBM recommends that you install a level of code with a fix for this vulnerability, you can mitigate, although not eliminate, your risk until you have done so by ensuring that all users who have access to the system are authenticated by a firewall, which is configured to drop UDP DNS packets larger than 512 bytes and limit all replies to 1024 bytes when TCP protocol is being used.
Get Notified about Future Security Bulletins
19 February 2016: First draft
*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.
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.