CVE-2017-12236
CriticalSummary
A vulnerability in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE 3.2 through 16.5 allows an unauthenticated, remote attacker to bypass authentication checks when registering an Endpoint Identifier (EID) to a Routing Locator (RLOC) in the map server/map resolver (MS/MR). A logic error in the code enables the attacker to send specific valid map-registration requests that will be accepted even if the authentication keys do not match.
Risk Assessment
An attacker could inject invalid mappings of EIDs to RLOCs in the MS/MR, leading to serious security and data integrity issues within the network. This poses a risk of traffic interception and potential attacks on other resources.
Recommendation
It is recommended to update Cisco IOS XE software to the latest version to mitigate this vulnerability. Additionally, monitoring network traffic for unauthorized map registration attempts is advisable.
Original NVD description (English source)
A vulnerability in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE 3.2 through 16.5 could allow an unauthenticated, remote attacker using an x tunnel router to bypass authentication checks performed when registering an Endpoint Identifier (EID) to a Routing Locator (RLOC) in the map server/map resolver (MS/MR). The vulnerability is due to a logic error introduced via a code regression for the affected software. An attacker could exploit this vulnerability by sending specific valid map-registration requests, which will be accepted by the MS/MR even if the authentication keys do not match, to the affected software. A successful exploit could allow the attacker to inject invalid mappings of EIDs to RLOCs in the MS/MR of the affected software. This vulnerability affects Cisco devices that are configured with LISP acting as an IPv4 or IPv6 map server. This vulnerability affects Cisco IOS XE Software release trains 3.9E and Everest 16.4. Cisco Bug IDs: CSCvc18