cisco-sa-20180926-tacplus: Cisco IOS and IOS XE Software TACACS+ Client Denial of Service Vulnerability
First published: Wed Sep 26 2018(Updated: )
A vulnerability in the TACACS+ client subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of crafted TACACS+ response packets by the affected software. An attacker could exploit this vulnerability by injecting a crafted TACACS+ packet into an existing TACACS+ session between an affected device and a TACACS+ server or by impersonating a known, valid TACACS+ server and sending a crafted TACACS+ packet to an affected device when establishing a connection to the device. To exploit this vulnerability by using either method, the attacker must know the shared TACACS+ secret and the crafted packet must be sent in response to a TACACS+ request from a TACACS+ client. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. 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-20180926-tacplus
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | ||
| Cisco IOS XE Software |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20180926-tacplus?
The severity of cisco-sa-20180926-tacplus is classified as a denial of service (DoS) vulnerability.
How do I fix cisco-sa-20180926-tacplus?
To fix cisco-sa-20180926-tacplus, update the affected Cisco IOS Software or Cisco IOS XE Software to the latest recommended version.
Who is affected by cisco-sa-20180926-tacplus?
Devices running vulnerable versions of Cisco IOS Software and Cisco IOS XE Software are affected by cisco-sa-20180926-tacplus.
What type of attack can be executed using cisco-sa-20180926-tacplus?
An unauthenticated remote attacker can trigger a reload of the device, leading to a denial of service (DoS) condition using cisco-sa-20180926-tacplus.
Can cisco-sa-20180926-tacplus be exploited remotely?
Yes, cisco-sa-20180926-tacplus can be exploited remotely by an attacker without authentication.
- agent/type
- agent/event
- agent/first-publish-date
- agent/last-modified-date
- collector/cisco-advisory
- source/Cisco
- agent/references
- agent/title
- agent/severity
- agent/weakness
- agent/description
- agent/source
- agent/softwarecombine
- agent/tags
- agent/guess-ai
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- vendor/cisco
- canonical/cisco ios
- canonical/cisco ios xe software