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.
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Affected Vendors & Products
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History
Thu, 21 Nov 2024 20:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: cisco
Published: 2019-09-25T20:16:01.918904Z
Updated: 2024-11-21T19:13:21.025Z
Reserved: 2019-06-04T00:00:00
Link: CVE-2019-12664
Vulnrichment
Updated: 2024-08-04T23:24:39.255Z
NVD
Status : Modified
Published: 2019-09-25T21:15:11.343
Modified: 2024-11-21T04:23:18.470
Link: CVE-2019-12664
Redhat
No data.