Security Bulletin: IBM System x and Flex Systems Potential Denial of Service Due to Weak IPv4 and IPv6 Sequence Numbers

Summary

Potentially predictable IPv4 and IPv6 sequence numbers generated by Linux kernels before version 3.1 may make it easier for remote attackers to cause a denial of service or hijack network sessions…

Vulnerability Details

Abstract

Potentially predictable IPv4 and IPv6 sequence numbers generated by Linux kernels before version 3.1 may make it easier for remote attackers to cause a denial of service or hijack network sessions.

Content

Vulnerability Details:

BM BladeCenter Advanced Management Module (AMM) | 1.00 to 3.64L

CVE ID: CVE-2011-3188

Description:
Potentially predictable IPv4 and IPv6 sequence numbers generated by Linux kernels before version 3.1 may make it easier for remote attackers to cause a denial of service or hijack network sessions.

CVSS:
CVSS Base Score: 5.8
CVSS Temporal Score: See <http://xforce.iss.net/xforce/xfdb/69392&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:P)

Affected products and versions

List the affected versions/releases/platforms, as best possible.

• Flex System Chassis Management Module, Option part number 68Y7029
• Flex System Enterprise Chassis, type 7893, any model
• Flex System Enterprise Chassis, type 8721, any model
• Flex System Enterprise Chassis, type 8724, any model
• Flex System x220 Compute Node, Types 7906,2585, any model
• Flex System x240 Compute Node, Types 8737,8738,7863, any model
• Flex System x440 Compute Node, Type 7917, any model
• Flex System Manager Node, Types 7955,8731,8734, any model
• Flex System V7000 Dual Controller Storage Node, Type 4939, any model
• System x3100 M4, Type 2582, any model
• System x3250 M4,Type 2583, any model
• System x3300 M4, Type 7382, any model
• System x3500 M4, Type 7383, any model
• System x3530 M4, Type 7160, any model
• System x3550 M4, Type 7914, any model
• System x3630 M4, Type 7158, any model
• System x3630 M4 HD, Type 5466, any model
• System x3650 M4, Type 7915, any model
• System x3650 M4 HD, Type 5460, any model
• System x3750 M4, Types 8722,8733,8752, any model
• iDataPlex dx360 M4, Types 7912,7913, any model
• IBM System x iDataPlex Direct Water Cooled dx360 M4 server, Types 7918,7919, any model
• BladeCenter HS23, Types 7875,1929, any model
• BladeCenter HS23E, Types 8038,8039, any model
• BladeCenter Advanced Management Module, Option 25R5778
• BladeCenter T Advanced Management Module, Option 32R0835
• IBM BladeCenter™-E: Type 1881, 7967, 8677
• IBM BladeCenter™-H: Types 1886, 7989, 8852
• IBM BladeCenter™-HT: Types 8740, 8750
• IBM BladeCenter™-S: Types 1948, 7779, 8886
• IBM BladeCenter™-T: Types 8720, 8730

Remediation:

Vendor Fix(es):

Workaround(s) & Mitigation(s):

None

References:

• Complete CVSS Guide
• On-line Calculator V2
• <http://xforce.iss.net/xforce/xfdb/69392&gt;

Related Information:
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement
None

Change History
10 January 2014: Original copy published

*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.