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Denial of Service vulnerability in OpenSSL (FreeBSD advisory SA-04.05.openssl)

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Article ID: JSA10322 SECURITY_ADVISORIES Last Updated: 09 May 2013Version: 2.0
Legacy Advisory Id:
PSN-2004-03-008
Product Affected:
All releases of JUNOS software built prior to March 18, 2004, and all current releases of the SDX provisioning software are vulnerable.
Problem:
Domestic releases of the JUNOS software include the OpenSSL software for managing authentication certificates and for managing the router through the JUNOScript application. Due to a coding error, when processing an SSL/TLS ChangeCipherSpec message, OpenSSL may fail to check that a new cipher was previously negotiated. As a result of this failure, the JUNOScript application might stop operating.

This vulnerability is described in more detail in the OpenSSL Security Advisory and the associated FreeBSD Security Advisory.

Note: The OpenSSL advisory refers to an additional vulnerability when using Kerberos ciphersuites. Since neither JUNOS nor SDX software is capable of using Kerberos ciphersuites, the additional vulnerability is not applicable.
Solution:
The JUNOS software has been modified to properly detect that a new cipher had been previously negotiated. If a new cipher was not previously negotiated, the request to change to the new cipher is rejected.
Implementation:
For JUNOS software, the corrected software is available in all JUNOS software releases built on or after March 18, 2004. Contact Juniper Networks Technical Assistance Center for software availability and download instructions.

As a workaround, customers can disable the JUNOScript SSL server using the command
[edit]
user@router# deactivate system service xnm-ssl
Alternatively, you can configure a firewall filter that restricts access to the JUNOScript server (running on TCP port 3221) from untrusted sources.

For the SDX provisioning software, customers should contact JTAC to determine the availability of corrected software.
Severity Level:
Medium
Severity Assessment:
A remote attacker can disrupt management access to the router or to the provisioning system. Currently, there is no known exploit for this vulnerability.
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