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Cisco Bug: CSCvi08450 - CWS redirection on ASA doesn't treat SSL Client Hello retransmission properly in specific condition

Last Modified

Sep 13, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.6 9.7 9.8

Description (partial)

Symptom:
The ASA, when redirecting HTTPS traffic to a Cloud Web Security tower, may incorrectly modify the sequence numbers for retransmitted SSL Client Hello during SSL handshake resulting in connectivity problems and/or poor performance in rare situations.

Conditions:
This appears to occur only when the client retransmits the HTTPS Client Hello after initial Client Hello has been already acnoledged by CWS tower
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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