SSA-784507

Siemens Security Advisory by Siemens ProductCERT

SSA-784507: Apache Log4j Vulnerability (CVE-2021-44832) via JDBC Appender - Impact to Siemens Products

Publication Date:	2021-12-28
Last Update:	2021-12-28
Current Version:	V1.0
CVSS v3.1 Base Score:	6.6

SUMMARY

Apache Log4j2 versions 2.0-beta7 through 2.17.0 (excluding security fix releases 2.3.2 and 2.12.4) contain a vulnerability (CVE-2021-44832) that could allow an attacker with permission to modify the logging configuration file to execute arbitrary code, when the JDBC Appender is used [1].

This advisory informs about the impact of CVE-2021-44832 to Siemens products and the corresponding remediation and mitigation measures. The vulnerability is different from other JNDI lookup vulnerabilities, the impact of which is documented in SSA-661247 [2].

Currently, no products vulnerable to CVE-2021-44832 have been identified.

Siemens is investigating to determine which products are affected and is continuously updating this advisory as more information becomes available. See section Additional Information for more details regarding the investigation status.

[1] https://logging.apache.org/log4j/2.x/security.html

[2] https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf

AFFECTED PRODUCTS AND SOLUTION

Affected Product and Versions	Remediation
No product currently identified as affected: No versions	The table will be updated in case vulnerable products become known.

WORKAROUNDS AND MITIGATIONS

Siemens has not identified any additional specific workarounds or mitigations. Please follow the General Security Recommendations.

Product specific mitigations can be found in the section Affected Products and Solution.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens’ operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

VULNERABILITY CLASSIFICATION

The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss). The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at: https://cwe.mitre.org/.

Vulnerability CVE-2021-44832

Apache Log4j2 versions 2.0-beta7 through 2.17.0 (excluding security fix releases 2.3.2 and 2.12.4) are vulnerable to code execution attacks if the JDBC Appender is being used and configured to allow the use of protocols other than Java.

This could allow attackers with permission to modify the logging configuration file to execute code via a data source referencing a JNDI URI. This issue is fixed by limiting JNDI data source names to the java protocol in Log4j2 versions 2.17.1, 2.12.4, and 2.3.2.

CVSS v3.1 Base Score	6.6
CVSS Vector	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CWE:	CWE-20: Improper Input Validation

ADDITIONAL INFORMATION

For more information on CVE-2021-44832 refer to:

Apache Log4j security site: https://logging.apache.org/log4j/2.x/security.html
US NVD Vulnerability entry: https://nvd.nist.gov/vuln/detail/CVE-2021-44832

The impact of other Apache log4j vulnerabilities to Siemens products is described in:

Log4shell (CVE-2021-44228, CVE-2021-45046): https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf
Denial of service vulnerability: https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf

Siemens recommends to stay informed about updates of SSA-661247, SSA-501673 and SSA-784507.

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 (2021-12-28): Publication Date

Siemens Security Advisories are subject to the terms and conditions contained in Siemens’ underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens’ Global Website https://new.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.

SSA-784507