cisco firepower-management-center CVE-2021-1224 in Cisco and Snort Products
Published on January 13, 2021

Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

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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.

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Vulnerability Analysis

CVE-2021-1224 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Weakness Type

Protection Mechanism Failure

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. This weakness covers three distinct situations. A "missing" protection mechanism occurs when the application does not define any mechanism against a certain class of attack. An "insufficient" protection mechanism might provide some defenses - for example, against the most common attacks - but it does not protect against everything that is intended. Finally, an "ignored" mechanism occurs when a mechanism is available and in active use within the product, but the developer has not applied it in some code path.


Products Associated with CVE-2021-1224

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-1224 are published in these products:

Cisco Firepower Management Center
 
Cisco Firepower Threat Defense
 
Snort
 
Cisco Secure Firewall Management Center
 
Cisco Firepower Threat Defense Software
 

Affected Versions

Cisco Firepower Threat Defense Software Version n/a is affected by CVE-2021-1224

Exploit Probability

EPSS
0.48%
Percentile
64.42%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.