Cisco IOS/IOS XE Aggregation Services input validation

Summaryinfo

A vulnerability was found in Cisco IOS and IOS XE. It has been classified as problematic. Affected by this issue is some unknown functionality of the component Aggregation Services. This manipulation causes input validation. The identification of this vulnerability is CVE-2019-1749. The attack needs to be done within the local network. There is no exploit available.

Detailsinfo

A vulnerability has been found in Cisco IOS and IOS XE (Router Operating System) (unknown version) and classified as problematic. Affected by this vulnerability is an unknown code block of the component Aggregation Services. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability in the ingress traffic validation of Cisco IOS XE Software for Cisco Aggregation Services Router (ASR) 900 Route Switch Processor 3 (RSP3) could allow an unauthenticated, adjacent attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability exists because the software insufficiently validates ingress traffic on the ASIC used on the RSP3 platform. An attacker could exploit this vulnerability by sending a malformed OSPF version 2 (OSPFv2) message to an affected device. A successful exploit could allow the attacker to cause a reload of the iosd process, triggering a reload of the affected device and resulting in a DoS condition.

The bug was discovered 03/27/2019. The weakness was shared 03/28/2019 as cisco-sa-20190327-rsp3-ospf as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2019-1749 since 12/06/2018. Access to the local network is required for this attack. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/17/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316397 (Cisco Aggregation Services Router 900 Route Switch Processor 3 OSPFv2 Denial of Service Vulnerability(cisco-sa-20190327-rsp3-ospf)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-132532, VDB-132528, VDB-132527 and VDB-132526 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS
• IOS XE

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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