Improper access control in Cisco Expressway Software

1) Improper access control

EUVDB-ID: #VU48563

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3482

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper validation of specific connection information by the Traversal Using Relays around NAT (TURN) server. A remote attacker can send traffic through the affected software to destinations beyond the application and gain unauthorized network access.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Expressway: All versions

Cisco TelePresence Video Communication Server: All versions

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_expressway:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_telepresence_video_communication_server:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-Expressway-8J3yZ7hV

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.