VDB-132519 · CVE-2019-1738 · BID 107597

Cisco IOS/IOS XE Network-Based Application Recognition input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.1	$5k-$25k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Cisco IOS and IOS XE. This affects an unknown part of the component Network-Based Application Recognition. Performing a manipulation results in input validation. This vulnerability is cataloged as CVE-2019-1738. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Cisco IOS and IOS XE (Router Operating System) (affected version not known). This affects some unknown functionality of the component Network-Based Application Recognition. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a parsing issue on DNS packets. An attacker could exploit these vulnerabilities by sending crafted DNS packets through routers that are running an affected version and have NBAR enabled. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

The bug was discovered 03/27/2019. The weakness was shared 03/28/2019 as cisco-sa-20190327-nbar as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is uniquely identified as CVE-2019-1738 since 12/06/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing 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 316394 (Cisco IOS and IOS XE Software Network-Based Application Recognition Denial of Service Vulnerabilities(cisco-sa-20190327-nbar)).

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

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107597†). The entries VDB-132520 and VDB-132521 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Router Operating System

Vendor

Cisco

Name

License

commercial

Website

Vendor: https://www.cisco.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 7.1

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

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 8.6
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/06/2018 🔍
03/27/2019 +111 days 🔍
03/27/2019 +0 days 🔍
03/28/2019 +1 days 🔍
03/28/2019 +0 days 🔍
08/17/2023 +1603 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20190327-nbar
Status: Confirmed

CVE: CVE-2019-1738 (🔍)
GCVE (CVE): GCVE-0-2019-1738
GCVE (VulDB): GCVE-100-132519
SecurityFocus: 107597 - Cisco IOS and IOS XE Software Multiple Denial of Service Vulnerabilities

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

Entryinfo

Created: 03/28/2019 13:26
Updated: 08/17/2023 08:06
Changes: 03/28/2019 13:26 (62), 05/22/2020 10:20 (3), 08/17/2023 08:06 (14)
Complete: 🔍
Cache ID: 216::103