Crypt::CBC RandomIV header and Rijndael cipher weak encryption
| crypt-cbc-header-weak-encryption (24954) |  Low Risk |
Description:
Crypt::CBC uses a weak encryption algorithm when encrypting data using the legacy RandomIV header and the Rijindael cipher. This would result in weaker than expected data integrity and security.
*CVSS:
| Base Score: | 5.3 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 3.9 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Upgrade to the latest version of Crypt::CBC (2.17 or later), available from cpan.org. See References.
For Debian GNU/Linux:
Refer to DSA-996-1 for patch, upgrade, or suggested workaround information. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2006-03-15 for patch, upgrade, or suggested workaround information. See References.
References:
- BugTraq Mailing List, Thu Feb 23 2006 - 16:38:02 CST: Vulnerability in Crypt::CBC Perl module, versions <= 2.16.
- cpan.org: Lincoln D. Stein / Crypt-CBC.
- BID-16802: Lincoln D. Stein Crypt::CBC Perl Module Weak Ciphertext Vulnerability
- CVE-2006-0898: Crypt::CBC Perl module 2.16 and earlier, when running in RandomIV mode, uses an initialization vector (IV) of 8 bytes, which results in weaker encryption when used with a cipher that requires a larger block size than 8 bytes, such as Rijndael.
- DSA-996: libcrypt-cbc-perl -- programming error
- GLSA-200603-15: Crypt::CBC: Insecure initialization vector
- RHSA-2008-0261: Moderate: Red Hat Network Satellite Server security update
- RHSA-2008-0524: Low: Red Hat Network Satellite Server security update
- RHSA-2008-0630: Low: Red Hat Network Satellite Server security update
- SA18755: Crypt::CBC RandomIV Header IV Handling Security Issue
- SUSE-SR:2006:015: SUSE Security Summary Report
Platforms Affected:
- Debian Debian Linux 3.1
- Gentoo Linux
- Lincoln D. Stein Crypt::CBC 2.16 and prior
- RedHat Network Satellite Server 4.2
- RedHat Network Satellite Server 5.0
- RedHat Network Satellite Server 5.1
Reported:
Feb 23, 2006
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* 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.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.