#VU64450 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Cisco Systems, Inc Other software


Published: 2022-06-16

Vulnerability identifier: #VU64450

Vulnerability risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2022-20817

CWE-ID: CWE-338

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Unified IP Phone 6901
Hardware solutions / Office equipment, IP-phones, print servers
ATA 187 Analog Telephone Adapter
Hardware solutions / Office equipment, IP-phones, print servers
Unified IP Phone 8945
Hardware solutions / Office equipment, IP-phones, print servers
Unified IP Phone 8961
Hardware solutions / Office equipment, IP-phones, print servers
Unified IP Phone 9951
Hardware solutions / Office equipment, IP-phones, print servers
Unified IP Phone 9971
Hardware solutions / Office equipment, IP-phones, print servers
Unified IP Phone 6911
Hardware solutions / Routers & switches, VoIP, GSM, etc
Unified IP Phone 6921
Hardware solutions / Routers & switches, VoIP, GSM, etc
Unified IP Phone 6941
Hardware solutions / Routers & switches, VoIP, GSM, etc
Unified IP Phone 6945
Hardware solutions / Routers & switches, VoIP, GSM, etc
Unified IP Phone 6961
Hardware solutions / Routers & switches, VoIP, GSM, etc
Unified IP Phone 8941
Other software / Other software solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to impersonate another user's phone. 

The vulnerability exists due to due to improper key generation during the manufacturing process that could result in duplicated manufactured keys installed on multiple devices. A remote attacker can perform a machine-in-the-middle attack and impersonate another user's phone if the Cisco Unified Communications Manager (CUCM) is in secure mode.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Unified IP Phone 6901 : All versions

ATA 187 Analog Telephone Adapter: All versions

Unified IP Phone 6911: All versions

Unified IP Phone 6921: All versions

Unified IP Phone 6941: All versions

Unified IP Phone 6945: All versions

Unified IP Phone 6961: All versions

Unified IP Phone 8941: All versions

Unified IP Phone 8945 : All versions

Unified IP Phone 8961 : All versions

Unified IP Phone 9951 : All versions

Unified IP Phone 9971 : All versions


External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cp6901-dup-cert-82jdJGe4


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.


Latest bulletins with this vulnerability