Improper Verification of Cryptographic Signature in Cisco Firepower Threat Defense Software

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU27584

Risk: Low

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3308

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote user to install a malicious software patch on an affected device.

The vulnerability exists due to improper verification of digital signatures for patch images in the Image Signature Verification feature. A remote administrator can craft an unsigned software patch, bypass signature checks, load it on an affected device and boot a malicious software patch image.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 6.1.0 - 6.2.2

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sigbypass-FcvPPCeP

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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