CVE-2017-3873 Code injection in Cisco Aironet 1800, 2800, and 3800 Series Access Points
An adjacent attacker can execute arbitrary code with root privileges on Cisco Aironet access points during initial boot or factory reset via malicious PnP responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-3873?
CVE-2017-3873 is a high-severity code injection vulnerability in Cisco Aironet 1800, 2800, and 3800 Series Access Points, published on 16 May 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Plug-and-Play (PnP) subsystem of the Cisco Aironet 1800, 2800, and 3800 Series Access Points running a Lightweight Access Point (AP) or Mobility Express image could allow an unauthenticated, adjacent attacker to execute arbitrary code with root privileges. The vulnerability is due to insufficient validation of PnP server responses. The PnP feature is only active while the device does not contain a configuration, such as a first time boot or after a factory reset has been issued. An attacker with the ability to respond to PnP configuration requests from the affected device can exploit the vulnerability by returning malicious PnP responses. If a Cisco Application Policy Infrastructure Controller - Enterprise Module (APIC-EM) is available on the network, the attacker would need to exploit the issue in the short window before a valid PnP response was received. If successful, the attacker could gain the ability to execute arbitrary code with root privileges on the underlying operating system of the device. Cisco has confirmed that the only vulnerable software version is 8.3.102.0. Cisco Bug IDs: CSCvb42386.
Weakness: CWE-20
Which versions are affected by CVE-2017-3873?
It affects 1 product.
Products include Cisco Aironet Access Point Firmware.
How do I fix CVE-2017-3873?
No fix has been published for CVE-2017-3873 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2017-3873 being exploited?
There is no known exploitation of CVE-2017-3873 in the wild and no public exploit code.
Other vulnerabilities in Cisco Aironet 1800, 2800, and 3800 Series Access Points
- CVE-2017-3834 Hardcoded credentials in Cisco Aironet 1830 Series and 1850 Series Access Points
- CVE-2019-1834 Cisco Aironet Series Access Points Denial of Service Vulnerability
- CVE-2019-1826 Cisco Aironet Series Access Points Quality of Service Denial of Service Vulnerability
- CVE-2019-1829 Cisco Aironet Series Access Points Command Injection Vulnerability
- CVE-2019-1835 Cisco Aironet Series Access Points Directory Traversal Vulnerability
Sources
Also known as GHSA-28h8-6qf2-j7rh.