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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in RC4 stream cipher
affects IBM Security AppScan Standard (CVE-2015-2808)
30 April 2015
AusCERT Security Bulletin Summary
Product: IBM Security AppScan Standard
Operating System: Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
CVE Names: CVE-2015-2808
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Security
AppScan Standard (CVE-2015-2808)
More support for:
IBM Security AppScan Standard
8.0, 8.5, 184.108.40.206, 8.7, 8.8, 9.0, 9.0.1, 9.0.2
The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM Security AppScan Standard.
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
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
IBM Security AppScan Standard - 9.0.2, 9.0.1, 9.0, 8.8, 8.7, 8.6, 8.5, 8.0
IBM Rational AppScan Standard 8.5, 8.0
Workarounds and Mitigations
In order to mitigate this risk, please follow the instructions in the below
article from Microsoft which explains how to disable RC4.
This should be done on the machines where AppScan Standard is installed.
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.
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Complete CVSS Guide
On-line Calculator V2
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
April 29, 2014: Original Version 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.
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.
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