Security Bulletin: Vulnerability in RC4 stream cipher affects Connect:Express for UNIX (CVE-2015-2808)

Summary

The RC4 “Bar Mitzvah” Attack for SSL/TLS affects Connect:Express for UNIX

Vulnerability Details

CVEID: CVE-2015-2808

DESCRIPTION: The RC4 algorithm, as used in the TLS protocol and SSL protocol, could allow a remote attacker to obtain sensitive information. An attacker could exploit this vulnerability to remotely expose account credentials without requiring an active man-in-the-middle session. Successful exploitation could allow an attacker to retrieve credit card data or other sensitive information. This vulnerability is commonly referred to as “Bar Mitzvah Attack”.

CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM Sterling Connect:Express for UNIX 1.4.6
- All versions prior to 1.4.6.1 iFix 146-109

IBM Sterling Connect:Express for UNIX 1.5.0
- All versions prior to 1.5.0.12 (included)

Remediation/Fixes

None

Workarounds and Mitigations

To protect yourself against the attack above, for each SSL server and client definition, ciphers using RC4 should be disabled. Each SSL definition must specify a cipher list. In the Sterling Connect:Express for UNIX Documentation, refer to the Chapter 4 of “Sterling Connect:Express for UNIX Option SSL” to learn how to specify a cipher list in a SSL server or client definition. In the cipher list, all RC4 ciphers must be disabled.

Visit https://www.openssl.org/ to learn how to use the OpenSSL cipher list tool.

You should verify applying this configuration change does not cause any compatibility issues. Not disabling the RC4 stream cipher will expose yourself to the attack described above. IBM recommends that you review your entire environment to identify other areas where you have enabled the RC4 stream cipher and take appropriate mitigation and remediation actions.