Yi Home Camera 27US 1.8.7.0D 7-zip File input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
6.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Yi Home Camera 27US 1.8.7.0D. Affected is an unknown function of the component 7-zip File Handler. This manipulation causes input validation. This vulnerability appears as CVE-2018-3920. It is feasible to perform the attack on the physical device. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Yi Home Camera 27US 1.8.7.0D. Affected by this vulnerability is some unknown processing of the component 7-zip File Handler. 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 confidentiality, integrity, and availability. The summary by CVE is:

An exploitable code execution vulnerability exists in the firmware update functionality of the Yi Home Camera 27US 1.8.7.0D. A specially crafted 7-Zip file can cause a CRC collision, resulting in a firmware update and code execution. An attacker can insert an SDcard to trigger this vulnerability.

The bug was discovered 10/31/2018. The weakness was presented 11/02/2018 (Website). The advisory is shared at talosintelligence.com. This vulnerability is known as CVE-2018-3920 since 01/02/2018. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

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

See VDB-126435, VDB-126434, VDB-126432 and VDB-126431 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CNA Base Score: 7.6
CNA Vector (Talos): 🔍

CVSSv2info

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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: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/02/2018 🔍
10/31/2018 +302 days 🔍
11/02/2018 +2 days 🔍
11/02/2018 +0 days 🔍
11/03/2018 +1 days 🔍
06/04/2023 +1674 days 🔍

Sourcesinfo

Advisory: talosintelligence.com
Status: Not defined

CVE: CVE-2018-3920 (🔍)
GCVE (CVE): GCVE-0-2018-3920
GCVE (VulDB): GCVE-100-126433
See also: 🔍

Entryinfo

Created: 11/03/2018 11:48
Updated: 06/04/2023 14:03
Changes: 11/03/2018 11:48 (57), 04/09/2020 20:09 (1), 06/04/2023 14:03 (14)
Complete: 🔍
Cache ID: 216::103

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

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