Vulnerability identifier: #VU52752

Vulnerability risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1495

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances
Cisco UTD Snort IPS Engine Software for IOS XE
Other software / Other software solutions
Cisco UTD Engine for IOS XE SD-WAN
Other software / Other software solutions
Open Source Snort 2
Server applications / IDS/IPS systems, Firewalls and proxy servers
3000 Series Industrial Security Appliance (ISA)
Server applications / IDS/IPS systems, Firewalls and proxy servers
Snort
Server applications / IDS/IPS systems, Firewalls and proxy servers
Integrated Services Virtual Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cloud Services Router 1000V Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 8500L Series Edge Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 8300 Series Edge Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 8200 Series Edge Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 8000V Edge Software
Hardware solutions / Routers & switches, VoIP, GSM, etc
4000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 1000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to bypass a configured file policy for HTTP. 

The vulnerability exists due to incorrect handling of specific HTTP header parameters. A remote attacker can send specially crafted HTTP packets to bypass a configured file policy for HTTP packets and deliver a malicious payload. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 6.2.2, 6.2.3, 6.3.0, 6.4.0, 6.5.0, 6.6.0, 6.7.0

Cisco UTD Snort IPS Engine Software for IOS XE: 16.12 - 17.4

Cisco UTD Engine for IOS XE SD-WAN: 16.12 - 17.4

Open Source Snort 2: All versions

Integrated Services Virtual Routers: All versions

Cloud Services Router 1000V Series: All versions

Catalyst 8500L Series Edge Platforms: All versions

Catalyst 8300 Series Edge Platforms: All versions

Catalyst 8200 Series Edge Platforms: All versions

Catalyst 8000V Edge Software: All versions

4000 Series Integrated Services Routers: All versions

3000 Series Industrial Security Appliance (ISA): All versions

Cisco 1000 Series Integrated Services Routers: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-fp-bp-KfDdcQhc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.