Remote code execution in Cisco IOS and IOS XE Software Cisco Group Encrypted Transport VPN Software

1) Out-of-bounds write

EUVDB-ID: #VU81270

Risk: High

CVSSv4.0: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-20109

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols within the Cisco Group Encrypted Transport VPN (GET VPN) feature. A remote authenticated user with administrative control of either a group member or a key server can trigger an out-of-bounds write and execute arbitrary code on the target system.

Note, the vulnerability has been exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS: before 16.12.10, 17.3.7, 17.9.1y, 17.9.3, 17.9.4, 17.11.1, 17.12.1, 16.12.10, 16.12.10, 16.12.10

Cisco IOS XE: before 16.12.10, 17.3.7, 17.9.1y, 17.9.3, 17.9.4, 17.11.1, 17.12.1, 16.12.10, 16.12.10, 16.12.10

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios:*:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:*:*:*:*:*:*:*:*

External links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-getvpn-rce-g8qR68sx
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe24118
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf49531
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe14195

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?

Yes. This vulnerability is being exploited in the wild.