SSA-953710

Siemens Security Advisory by Siemens ProductCERT

SSA-953710: Vulnerabilities in the Network Communication Stack in Desigo Fire Safety UL and Cerberus PRO UL Fire Protection Systems

Publication Date:	2024-05-14
Last Update:	2024-05-14
Current Version:	V1.0
CVSS v3.1 Base Score:	10.0
CVSS v4.0 Base Score:	10.0

SUMMARY

Several products used in Desigo Fire Safety UL and Cerberus PRO UL Fire Protection Systems contain buffer overflow vulnerabilities in the network communication stack. Successful exploitation of the vulnerabilities could allow an unauthenticated attacker, who gained access to the fire protection system network, to execute arbitrary code on the affected products (CVE-2024-22039) or create a denial of service condition (CVE-2024-22040, CVE-2024-22041).

Product-specific impact of the individual vulnerabilities is documented in the chapter “Vulnerability Description”.

Siemens has released new versions for the affected products and recommends to update to the latest versions.

AFFECTED PRODUCTS AND SOLUTION

Affected Product and Versions	Remediation
Cerberus PRO UL Compact Panel FC922/924 All versions < MP4 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to MP4 or later version
Cerberus PRO UL Engineering Tool All versions < MP4 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to MP4 or later version
Cerberus PRO UL X300 Cloud Distribution All versions < V4.3.0001 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to V4.3.0001 or later version
Desigo Fire Safety UL Compact Panel FC2025/2050 All versions < MP4 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to MP4 or later version
Desigo Fire Safety UL Engineering Tool All versions < MP4 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to MP4 or later version
Desigo Fire Safety UL X300 Cloud Distribution All versions < V4.3.0001 affected by all CVEs CVE-2024-22039 CVE-2024-22040 CVE-2024-22041	Update to V4.3.0001 or later version

WORKAROUNDS AND MITIGATIONS

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure Siemens strongly recommends to protect network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

PRODUCT DESCRIPTION

Cerberus PRO UL is a fire protection system consisting of fire panels, detection and management stations, available for Siemens Partners in the UL/ULC Fire and Life Safety market.

Desigo Fire Safety UL is a fire protection system consisting of fire panels, detection and management stations, available for the UL/ULC Fire and Life Safety market.

VULNERABILITY DESCRIPTION

Un-/Collapse All

This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2024-22039

The network communication library in affected systems does not validate the length of certain X.509 certificate attributes which might result in a stack-based buffer overflow. This could allow an unauthenticated remote attacker to execute code on the underlying operating system with root privileges.

CVSS v3.1 Base Score	10.0
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
CVSS v4.0 Base Score	10.0
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE	CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product Specific Vulnerability Description

For the following products, the impact of the vulnerability is different.

Cerberus PRO UL Engineering Tool:

Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; code execution might be possible on the underlying operating system with the privileges of the engineering tool user account.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H (9.0)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H (9.0)

Desigo Fire Safety UL Engineering Tool:

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H (9.0)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H (9.0)

Vulnerability CVE-2024-22040

The network communication library in affected systems insufficiently validates HMAC values which might result in a buffer overread. This could allow an unauthenticated remote attacker to crash the network service.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-125: Out-of-bounds Read

Product Specific Vulnerability Description

For the following products, the impact of the vulnerability is different.

Cerberus PRO UL Engineering Tool:

Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; possible impact is limited to the tool, not the underlying operating system.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (5.9)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N (6.0)

Desigo Fire Safety UL Engineering Tool:

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (5.9)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N (6.0)

Vulnerability CVE-2024-22041

The network communication library in affected systems improperly handles memory buffers when parsing X.509 certificates. This could allow an unauthenticated remote attacker to crash the network service.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Product Specific Vulnerability Description

For the following products, the impact of the vulnerability is different.

Cerberus PRO UL Engineering Tool:

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (5.9)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N (6.0)

Desigo Fire Safety UL Engineering Tool:

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (5.9)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N (6.0)

ADDITIONAL INFORMATION

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2024-05-14):

Publication Date

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