cisco-sa-wlc-gas-dos-8FsE3AWH: Cisco Wireless LAN Controller 802.11 Generic Advertisement Service Denial of Service Vulnerability
First published: Wed Apr 15 2020(Updated: )
A vulnerability in the 802.11 Generic Advertisement Service (GAS) frame processing function of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS). The vulnerability is due to incomplete input validation of the 802.11 GAS frames that are processed by an affected device. An attacker could exploit this vulnerability by sending a crafted 802.11 GAS frame over the air to an access point (AP), and that frame would then be relayed to the affected WLC. Also, an attacker with Layer 3 connectivity to the WLC could exploit this vulnerability by sending a malicious 802.11 GAS payload in a Control and Provisioning of Wireless Access Points (CAPWAP) packet to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-gas-dos-8FsE3AWH This advisory is part of the April 2020 Cisco Aironet AP, Mobility Express, and WLC Software Security Advisory Bundled Publication, which includes four Cisco Security Advisories that describe four vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: April 2020 Cisco Aironet AP, Mobility Express and WLC Software Security Advisory Bundled Publication.
Credit: This vulnerability was found by Mathieu Monney Cisco during internal security testing
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Wireless LAN Controller (WLC) Software | =8.10<8.10.112.0=8.9<8.10.112.0=8.8<8.8.130.0<8.8.130.0<8.8.130.0=8.5 and earlier<8.5.160.0 | 8.10.112.0 8.10.112.0 8.8.130.0 8.8.130.0 8.8.130.0 8.5.160.0 |
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Frequently Asked Questions
What is the severity of Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH?
The severity of Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH is high due to its potential to cause denial of service.
How do I fix Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH?
To fix Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH, upgrade the Cisco Wireless LAN Controller software to a fixed version released by Cisco.
What products are affected by Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH?
Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH affects multiple versions of Cisco Wireless LAN Controller (WLC) Software.
Can Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH be exploited remotely?
Yes, Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH can be exploited by unauthenticated remote attackers.
What impact does Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH have on systems?
Cisco vulnerability cisco-sa-wlc-gas-dos-8FsE3AWH can lead to a denial of service by causing the affected device to reload.
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