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Cisco Bug: CSCsz04690 - SSL Cert Header behavior may allow spoofing of trusted client

Last Modified

Aug 06, 2018

Products (1)

  • Cisco CSS 11000 Series Content Services Switches

Known Affected Releases

5.0(0.3.1.1) 8.20

Description (partial)

Symptom:
A reported spoofing vulnerability in the enforcement of HTTP certificate headers by researcher George D. Gal of Virtual Security Research LLC.

This is documented at the following IntelliShield alert:

 * http://tools.cisco.com/security/center/viewAlert.x?alertId=20807

Conditions:
The CSS does not look for and remove any of the headers that may be inserted as part of the http-header command, specifically "ssl-server X http-header client-cert". If someone were to insert these headers prior to encryption before they arrived at the CSS and such they were there after decryption, someone could impersonate a different client.
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