Subject: Security Advisory (BEA07-169.00)
From: BEA Systems Inc.
Minor Subject: WebLogic SSL may verify RSA Signatures incorrectly if the RSA key exponent is 3
Product(s) Affected: WebLogic Server and WebLogic Express
Threat level: High
An attacker may forge a signature if the public key exponent is 3.
Severity: Medium
SSL connections to servers with forged certificates may be verified as valid.
A problem was identified that could potentially cause a security vulnerability in certain versions of WebLogic Server. A patch is available to correct this problem (see Section II). BEA Systems treats potential security problems with a high degree of urgency and endeavors to take appropriate steps to help ensure the security of our customers' systems. As a result, BEA Systems strongly suggests the following actions:
I. Read the following advisory.
II. Apply the suggested action.
III. If you know of any additional users interested in future security advisories, please forward them the registration instructions included in this advisory.
I. Advisory
WebLogic SSL may verify incorrectly RSA signatures if the RSA public key exponent is 3. An attacker can create certificates with a forged signature that makes the SSL certificate chain to be improperly verified as valid.
This advisory corrects this problem by rejecting RSA certificates with a public key exponent of 3.
Additional details about this vulnerability can be found at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4339
Impact and CVSS Ratings:
CVSS Severity Score: 5.6 (Medium)
Attack Range (AV): Remote
Attack Complexity (AC): High
Level of Authentication Needed (Au): Not Required
Impact Type: Improper authentication or signature validation; allows partial confidentiality, integrity and availability violation
Vulnerability Type: Spoofing, Exceptional Condition Error
CVSS Base Score Vector: (AV:R/AC:H/Au:NR/C:P/I:P/A:P/B:N)
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
Online Calculator: http://nvd.nist.gov/cvss.cfm?calculator
The following versions of WebLogic Server and WebLogic Express are affected by this vulnerability
- WebLogic Server 9.2 on all platforms
- WebLogic Server 9.1 on all platforms
- WebLogic Server 9.0 on all platforms
- WebLogic Server 8.1 released through Service Pack 6, on all platforms
- WebLogic Server 7.0 released through Service Pack 7, on all platforms
II. SUGGESTED ACTION
BEA Systems strongly recommends the following course of actions.
WebLogic Server 9.2
- Upgrade to WebLogic Server 9.2 Maintenance Pack 1.
WebLogic Server 9.1
- Use the Smart Update tool to install the patch for CR295567.
WebLogic Server 9.0
Install the 9.0 GA Combo patch from support.bea.com by requesting Bug ID CR239280.
Install the patch from:
ftp://anonymous:dev2dev%40bea.com@ftpna.bea.com/pub/releases/security/CR295567_900.jarPlace the jar for the patch at the end of the PATCH_CLASSPATH.
WebLogic Server and WebLogic Express version 8.1
Upgrade to WebLogic Server and WebLogic Express 8.1 Service Pack 6.
Install the patch from:
ftp://anonymous:dev2dev%40bea.com@ftpna.bea.com/pub/releases/security/CR295567_81sp6.jarPlace the jar for the patch in the CLASSPATH before the weblogic.jar file.
WebLogic Server and WebLogic Express version 7.0
Upgrade to WebLogic Server and WebLogic Express 7.0 Service Pack 7.
Install the patch from:
ftp://anonymous:dev2dev%40bea.com@ftpna.bea.com/pub/releases/security/CR295567_70sp7.jarPlace the jar for the patch in the CLASSPATH before the weblogic.jar file.
BEA strongly suggests that customers apply the remedies recommended in all our security advisories. BEA also urges customers to apply every Service/Maintenance Pack as they are released. Service/Maintenance Packs include a roll-up of all bug fixes for each version of the product, as well as each of the prior Service/Maintenance Packs. Service/Maintenance Packs and information about them can be found at:
WebLogic Server: http://commerce.bea.com/showallversions.jsp?family=WLS
WebLogic Platform: http://commerce.bea.com/showallversions.jsp?family=WLP
Note: Information about securing WebLogic Server and WebLogic Express can be found at http://edocs.bea.com/wls/docs81/security.html. Specific lockdown information is provided at http://edocs.bea.com/wls/docs81/lockdown/index.html. We strongly encourage you to review this documentation to ensure your server deployment is securely configured.
III. FUTURE SECURITY COMMUNICATIONS
If there are security-related issues with BEA product, BEA Systems generally distributes an advisory and instructions with a recommended course of action. Because the security of your site, data, and code is a high priority, we are committed to generally communicating security-related issues to our customers and partners.
All previous advisories can be viewed at http://dev2dev.bea.com/advisoriesnotifications/
BEA Systems has established an opt-in emailing list specifically targeted for product security advisories and notifications. As a policy, if a user has opted-in to our emailing list and there is a relevant security issue with the BEA product(s) he/she is using, BEA generally distributes an advisory and instructions via email with a recommended course of action.
ADDITIONAL USERS WHO WISH TO REGISTER FOR ADVISORY DISTRIBUTION SHOULD FOLLOW THE REGISTRATION DIRECTIONS AT http://dev2dev.bea.com/advisoriesnotifications/
IV. REPORTING SECURITY ISSUES
Security issues can be reported to BEA Systems by sending email to secalert@bea.com or by following the directions at http://dev2dev.bea.com/advisoriesnotifications/. If BEA has validated a reported security issue, we will endeavor to assess the severity of the impact of the security issue and the likelihood of the exploitation of the vulnerability. Based on these assessments and other factors, BEA will endeavor to develop and appropriately prioritize a workaround or patch designed to reduce or eliminate the risk of the vulnerability.
If you have any questions or care to verify the authenticity of this advisory, please contact BEA Technical Support at support@bea.com
Thank you,
BEA Systems, Inc.
