2021-35392 | Realtek Jungle SDK WiFi Simple Config Server heap-based overflow

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.
5.5	$0-$5k	1.43

A vulnerability classified as critical has been found in Realtek Jungle SDK up to 3.4.14B. This affects an unknown code block of the component WiFi Simple Config Server. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-122. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Realtek Jungle SDK version v2.x up to v3.4.14B provides a ‘WiFi Simple Config’ server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a heap buffer overflow that is present due to unsafe crafting of SSDP NOTIFY messages from received M-SEARCH messages ST header.

The weakness was disclosed 08/16/2021. It is possible to read the advisory at iot-inspector.com. This vulnerability is uniquely identified as CVE-2021-35392 since 06/23/2021. The exploitability is told to be easy. Access to the local network is required for this attack. The requirement for exploitation is a authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/18/2021).

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

Vendor

Name

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

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Memory corruption
CWE: CWE-122
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

06/23/2021 CVE assigned
08/16/2021 +54 days Advisory disclosed
08/16/2021 +0 days VulDB entry created
08/18/2021 +2 days VulDB last updateAdvisory: iot-inspector.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-35392 (🔒)

Created: 08/16/2021 16:22
Updated: 08/18/2021 17:38
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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