Cisco IOS XE up to 16.2 Border Gateway Protocol length input validation

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5.5$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Cisco IOS XE up to 16.2. This affects an unknown part of the component Border Gateway Protocol. Such manipulation of the argument length leads to input validation. This vulnerability is documented as CVE-2017-12319. The attack can be executed remotely. Additionally, an exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cisco IOS XE up to 16.2 (Router Operating System) and classified as problematic. Affected by this issue is an unknown code block of the component Border Gateway Protocol. The manipulation of the argument length with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875.

The bug was discovered 11/03/2017. The weakness was released 03/27/2018 with Cisco as cisco-sa-20171103-bgp as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability is handled as CVE-2017-12319 since 08/03/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a exploit are known.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 104533 (Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial of Service Vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316171 (Cisco IOS XE Software Ethernet Virtual Private Network BGP Denial of Service Vulnerability (cisco-sa-20171103-bgp)). This issue was added on 03/03/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 03/24/2022:

Apply updates per vendor instructions.

Upgrading to version 16.3 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (104533) and SecurityFocus (BID 101676†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 104533
Nessus Name: Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial of Service Vulnerability
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: IOS XE 16.3

Timelineinfo

08/03/2017 🔍
11/03/2017 +92 days 🔍
11/03/2017 +0 days 🔍
11/03/2017 +0 days 🔍
11/13/2017 +10 days 🔍
03/27/2018 +134 days 🔍
03/27/2018 +0 days 🔍
03/28/2018 +1 days 🔍
09/09/2024 +2357 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20171103-bgp
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12319 (🔍)
GCVE (CVE): GCVE-0-2017-12319
GCVE (VulDB): GCVE-100-115106

OVAL: 🔍

SecurityFocus: 101676 - Cisco IOS XE Software CVE-2017-12319 Denial of Service Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 03/28/2018 09:08
Updated: 09/09/2024 22:29
Changes: 03/28/2018 09:08 (74), 01/17/2020 09:08 (5), 04/23/2024 19:49 (28), 07/17/2024 08:32 (1), 09/09/2024 22:29 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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