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

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

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 17.12.1

Cisco IOS XE: before 17.12.1

External links

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