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Cisco Bug: CSCvt43136 - Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

Last Modified

Apr 13, 2021

Products (1)

  • Cisco Firepower Management Center

Known Affected Releases

2.9.14.0 2.9.15 2.9.16 2.9.17 2.9.18

Description (partial)

Symptom:
Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP.

The vulnerability is due to incorrect detection of the HTTP payload if it is contained at least partially within the TFO connection handshake. An attacker could exploit this vulnerability by sending crafted TFO packets with an HTTP payload through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-tfo-bypass-MmzZrtes

Conditions:
Please refer to the Security Advisory.
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Bug Details Include

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