VDB-135118 · CVE-2019-1808 · BID 108367

Cisco NX-OS Image Signature Verification signature verification

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.
5.1$0-$5k0.00

A vulnerability classified as critical was found in Cisco NX-OS (Router Operating System) (the affected version is unknown). This vulnerability affects an unknown code of the component Image Signature Verification. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the Image Signature Verification feature of Cisco NX-OS Software could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by loading an unsigned software patch on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.

The bug was discovered 05/15/2019. The weakness was presented 05/15/2019 as cisco-sa-20190515-nxos-spsv as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2019-1808 since 12/06/2018. Local access is required to approach this attack. A single authentication is needed for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/21/2023).

The commercial vulnerability scanner Qualys is able to test this issue with plugin 316462 (Cisco MDS 9700 Series Multilayer Directors and Nexus 7000 or 7700 Series Switches Software Patch Signature Verification Vulnerability(cisco-sa-20190515-nxos-spsv)).

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

See 135122, 135121, 135120 and 135119 for similar entries.

Productinfo

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Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.2
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.4
NVD Vector: 🔍

CNA Base Score: 6.7
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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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 🔍
05/15/2019 +160 days 🔍
05/15/2019 +0 days 🔍
05/16/2019 +1 days 🔍
09/21/2023 +1589 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20190515-nxos-spsv
Status: Confirmed

CVE: CVE-2019-1808 (🔍)
SecurityFocus: 108367

See also: 🔍

Entryinfo

Created: 05/16/2019 08:38 AM
Updated: 09/21/2023 10:11 AM
Changes: 05/16/2019 08:38 AM (59), 06/12/2020 09:01 PM (1), 09/21/2023 10:05 AM (3), 09/21/2023 10:11 AM (12)
Complete: 🔍

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