CVE-2023-20109 Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write
An authenticated remote attacker with administrative control can execute arbitrary code or cause a denial of service on Cisco IOS devices using GET VPN.
- Exploited in the wild
- Since 10 Oct 2023
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-20109?
CVE-2023-20109 is a medium-severity memory corruption vulnerability in Cisco Ios, published on 27 Sep 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute arbitrary code on an affected device or cause the device to crash. This vulnerability is due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols of the GET VPN feature. An attacker could exploit this vulnerability by either compromising an installed key server or modifying the configuration of a group member to point to a key server that is controlled by the attacker. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a denial of service (DoS) condition. For more information, see the Details ["#details"] section of this advisory.
Weakness: CWE-787
Which versions are affected by CVE-2023-20109?
It affects 2 products.
Products include Cisco Ios, Cisco Ios Xe.
How do I fix CVE-2023-20109?
No fix has been published for CVE-2023-20109 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 31 Oct 2023.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-20109 being exploited?
Yes. Attackers have exploited CVE-2023-20109 in the wild since at least 10 Oct 2023.
Other vulnerabilities in Cisco Ios
- CVE-2017-12240 Cisco IOS and IOS XE Software DHCP Remote Code Execution
- CVE-2017-3881 Cisco IOS and IOS XE Remote Code Execution
- CVE-2018-0167 Cisco IOS, XR, and XE Software Buffer Overflow
- CVE-2017-6736 Cisco IOS and IOS XE Software SNMP Remote Code Execution
- CVE-2017-6737 Cisco IOS and IOS XE Software SNMP Remote Code Execution
Sources
Also known as GHSA-7h8h-8482-vvfh.