Desigo PXC Firmware Upload unrestricted upload

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.
8.5	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Desigo PXC. The affected element is an unknown function of the component Firmware Handler. The manipulation results in unrestricted upload (Upload). This vulnerability is cataloged as CVE-2018-4834. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Desigo PXC (unknown version). Affected is an unknown code block of the component Firmware Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability (Upload). CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been identified in Desigo Automation Controllers Compact PXC12/22/36-E.D, Desigo Automation Controllers Modular PXC00/50/100/200-E.D, Desigo Automation Controllers PXC00/64/128-U with Web module, Desigo Automation Controllers for Integration PXC001-E.D, Desigo Operator Unit PXM20-E. A remote attacker with network access to the device could potentially upload a new firmware image to the devices without prior authentication.

The bug was discovered 01/24/2018. The weakness was shared 01/24/2018 (Website). The advisory is shared for download at siemens.com. This vulnerability is traded as CVE-2018-4834 since 01/02/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1608.002.

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 102850†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Desigo

Name

• PXC

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: Upload
Class: Unrestricted upload / Upload
CWE: CWE-434 / CWE-284 / CWE-266
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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/02/2018 🔍
01/24/2018 +22 days 🔍
01/24/2018 +0 days 🔍
01/24/2018 +0 days 🔍
01/25/2018 +1 days 🔍
01/25/2018 +0 days 🔍
02/02/2023 +1834 days 🔍

Sourcesinfo

Advisory: ssa-824231
Researcher: Can Demirel, Melih Berk Eksioglu
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-4834 (🔍)
GCVE (CVE): GCVE-0-2018-4834
GCVE (VulDB): GCVE-100-112404
SecurityFocus: 102850 - Multiple Siemens Desigo Automation Controllers CVE-2018-4834 Authentication Bypass Vulnerability

Entryinfo

Created: 01/25/2018 08:17
Updated: 02/02/2023 14:52
Changes: 01/25/2018 08:17 (57), 12/27/2019 13:18 (4), 02/01/2021 16:02 (2), 02/02/2023 14:52 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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