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CVE-2021-1224: Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

Description

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.

Affected products

How to fix

Upgrade to a fixed version: Cisco IOS XE 17.4.1; Cisco Firepower Threat Defense Software 6.7.0; Snort 2.9.17. Check the vendor advisory for mitigations.

References

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