CRLF injection in Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software



Published: 2020-10-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-3561
CWE-ID CWE-93
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Cisco Adaptive Security Appliance (ASA)
Hardware solutions / Security hardware applicances

Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) CRLF injection

EUVDB-ID: #VU47886

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3561

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data in the Clientless SSL VPN (WebVPN). A remote attacker can trick a victim to click a specially crafted link and redirect the user to arbitrary websites.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 9.6 - 9.14

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


CPE2.3 External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-crlf-inj-BX9uRwSn

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.



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