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Security Bulletin: Tivoli Storage Manager Server GSKit Encrypted Record Length Vulnerability (CVE-2012-2191)

Security Bulletin


Summary

A vulnerability exists in the Tivoli Storage Manager server related to SSL/TLS Record Layer Processing (CVE-2012-2191).

Vulnerability Details

A vulnerability (CVE-2012-2191) exists in the IBM Tivoli Storage Manager (TSM) server when used with Secure Sockets Layer (SSL). An included component of the server, IBM Global Security (GSKit), does not properly validate data during execution of a protection mechanism against the Vaudenay SSL CBC timing attack, which allows remote attackers to cause a denial of service (application crash) via crafted values in the TLS Record Layer.

CVSS Base Score: 5

CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/75994 for the current score

CVSS Environmental Score*: Undefined

CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Affected Products and Versions

IBM Tivoli Storage Manager server release levels:

· 6.3.0 through 6.3.3.xxx

· 6.2.0 through 6.2.5.xxx

· 6.1.0 through 6.1.5.xxx (AIX and Windows servers only)

· 5.5.0 through 5.5.7.xxx (AIX and Windows servers only)

Remediation/Fixes

The recommended solution is to apply the fixes as soon as practical. Please see below for information on the fixes available and the links where the fixes can be downloaded.

ProductAPARRemediation/First Fix
IBM Tivoli Storage Manager Server 6.3IT015906.3.4.0:
http://www.ibm.com/support/docview.wss?uid=swg24035192
IBM Tivoli Storage Manager Server 6.2IT015906.2.6.0: http://www.ibm.com/support/docview.wss?uid=swg24037241
IBM Tivoli Storage Manager Server 6.1 and 5.5, on AIX and Windows only
IBM recommends using the Workaround specified below, or upgrading to a fixed, supported release

Note: Upgrading to a 7.1 server also remediates this vulnerability.

Workarounds and Mitigations

  • Remove the ability for client users to use SSL sessions by changing the server and/or storage agent option files to remove the SSL communication options
Or
  • Use a Stream Cipher such as RC4.

On Server levels 5.5.x.x, 6.1.x.x, and 6.2.x.x, mitigation may be made by creating an environment variable as follows:

- Set GSK_V3_CIPHER_SPECS=0504 and GSK_V2_CIPHER_SPECS=1 as a server process environment variable on vulnerable systems.

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

None

Change History

<08 May 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 Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Document Information

Modified date:
17 June 2018

UID

swg21672362

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