10-23-2011
SSL/TLS renegotiation DoS -how to disable? Is it advisable to disable?
Hi all Expertise,
I have following issue to solve,
SSL / TLS Renegotiation DoS (low) 222.225.12.13
Ease of Exploitation Moderate
Port 443/tcp
Family Miscellaneous
Following is the problem description:------------------
Description The remote service encrypts traffic using TLS / SSL and permits clients to
renegotiate
connections. The computational requirements for renegotiating a connection are
asymmetrical between the client and the server, with the server performing several times
more work. Since the remote host does not appear to limit the number of renegotiations
for a single TLS / SSL connection, this permits a client to open several simultaneous
connections and repeatedly renegotiate them, possibly leading to a denial of service
condition.
Impact Over All Impact - PARTIAL
Confidentiality Impact - NONE
Integrity Impact - NONE
Availability Impact - PARTIAL
Recommendations Contact the vendor for specific patch information. It is possible to temporarily workaround the flaw by implementing the following workaround: Disable TLS/SSL renegotiation.
My queries are-
1.How to diasble SSL/TLS Renegotitation ;what we modify in ssl.conf to disable it?
2. Is it advisable to disable it?
2a.If SSL/TLS Renegotitation is disabled then will it affect some operation?
Please guide me, I have googled on this issue but still not sure about mentioned issue's solution.
Please Guide me.
Thanks in Advance!
ONE MORE THING THE SSL CERTIFICATE HAS ALREADY EXPIRED.
So final question how to block a client opening several simultaneous connections and repeatedly renegotiate them, possibly leading to a denial of service condition?
Last edited by manalisharmabe; 10-23-2011 at 04:56 PM..
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