CVE-2019-12664: Cisco IOS XE Software ISDN Data Leak Vulnerability
First published: Wed Sep 25 2019(Updated: )
A vulnerability in the Dialer interface feature for ISDN connections in Cisco IOS XE Software for Cisco 4000 Series Integrated Services Routers (ISRs) could allow an unauthenticated, adjacent attacker to pass IPv4 traffic through an ISDN channel prior to successful PPP authentication. The vulnerability is due to insufficient validation of the state of the PPP IP Control Protocol (IPCP). An attacker could exploit this vulnerability by making an ISDN call to an affected device and sending traffic through the ISDN channel prior to successful PPP authentication. Alternatively, an unauthenticated, remote attacker could exploit this vulnerability by sending traffic through an affected device that is configured to exit via an ISDN connection for which both the Dialer interface and the Basic Rate Interface (BRI) have been configured, but the Challenge Handshake Authentication Protocol (CHAP) password for PPP does not match the remote end. A successful exploit could allow the attacker to pass IPv4 traffic through an unauthenticated ISDN connection for a few seconds, from initial ISDN call setup until PPP authentication fails.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | =16.6.4 | |
| Cisco 4321 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4351 Integrated Services Router |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2019-12664?
The severity of CVE-2019-12664 is high with a score of 7.5 out of 10.
How does CVE-2019-12664 affect Cisco IOS XE Software?
CVE-2019-12664 affects Cisco IOS XE Software versions 16.6.4.
What is the vulnerability in CVE-2019-12664?
CVE-2019-12664 is a vulnerability in the Dialer interface feature for ISDN connections in Cisco IOS XE Software for Cisco 4000 Series Integrated Services Routers (ISRs).
What is the impact of CVE-2019-12664?
CVE-2019-12664 allows an unauthenticated, adjacent attacker to pass IPv4 traffic through an ISDN channel prior to successful PPP authentication.
How can I fix CVE-2019-12664?
To fix CVE-2019-12664, it is recommended to update Cisco IOS XE Software to version 16.6.4 or apply the necessary patches provided by Cisco.
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