Vulnerability · Published Jan 13, 2021 · Assigned by cisco
CVE-2021-1224Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability
Medium 5.8
In plain English
A medium-severity security flaw in Cisco Firepower Threat Defense Software from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | snort | no fix listed | UBUNTU-CVE-2021-1224 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Firepower Threat Defense Software | n/a |
Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
References
- 20210113 Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability vendor-advisory
- [debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security update mailing-list
- DSA-5354 vendor-advisory