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AUSCERT External Security Bulletin Redistribution
ESB-2024.2265
ICS Advisory | ICSA-24-102-04 Siemens RUGGEDCOM APE1808
12 April 2024
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AusCERT Security Bulletin Summary
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Product: Siemens RUGGEDCOM APE1808
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2023-48795 CVE-2023-38802 CVE-2023-6789
CVE-2023-6793 CVE-2024-0008
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-04
Comment: CVSS (Max): 7.8 CVE-2024-0008 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-24-102-04)
Siemens RUGGEDCOM APE1808
Release Date
April 11, 2024
As of January 10, 2023, CISA will no longer be updating ICS security advisories
for Siemens product vulnerabilities beyond the initial advisory. For the most
up-to-date information on vulnerabilities in this advisory, please see Siemens'
ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
1. EXECUTIVE SUMMARY
o CVSS v4 8.2
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Siemens
o Equipment : RUGGEDCOM APE1808
o Vulnerabilities : Cross-site Scripting, Improper Privilege Management,
Improper Check for Unusual or Exceptional Conditions, Truncation of
Security-relevant Information, Insufficient Session Expiration
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow a malicious
administrator to store a JavaScript payload using the web interface, revoke
active XML API keys from the firewall and disrupt XML API usage, or cause a
denial-of-service.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Siemens RUGGEDCOM APE1808, an application hosting
platform, are affected:
o Siemens RUGGEDCOM APE1808: All versions with Palo Alto Networks Virtual
NGFW configured with support for the CHACHA20-POLY1305 algorithm or any
Encrypt-then-MAC algorithms (CVE-2023-48795)
o Siemens RUGGEDCOM APE1808: All versions with Palo Alto Networks Virtual
NGFW (CVE-2023-6789, CVE-2023-6793, CVE-2024-0008)
o Siemens RUGGEDCOM APE1808: All versions with Palo Alto Networks Virtual
NGFW that are configured with BGP routing features enabled (CVE-2023-38802)
3.2 Vulnerability Overview
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS
software enables a malicious authenticated read-write administrator to store a
JavaScript payload using the web interface. Then, when viewed by a properly
authenticated administrator, the JavaScript payload executes and disguises all
associated actions as performed by that unsuspecting authenticated
administrator.
CVE-2023-6789 has been assigned to this vulnerability. A CVSS v3.1 base score
of 4.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:R/S:C
/C:L/I:L/A:N ).
A CVSS v4 score has also been calculated for CVE-2023-6789 . A base score of
5.1 has been calculated; the CVSS vector string is ( CVSS4.0/AV:N/AC:L/AT:N/
PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N ).
3.2.2 IMPROPER PRIVILEGE MANAGEMENT CWE-269
An improper privilege management vulnerability in Palo Alto Networks PAN-OS
software enables an authenticated read-only administrator to revoke active XML
API keys from the firewall and disrupt XML API usage.
CVE-2023-6793 has been assigned to this vulnerability. A CVSS v3.1 base score
of 2.7 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U
/C:N/I:N/A:L ).
A CVSS v4 score has also been calculated for CVE-2023-6793 . A base score of
5.1 has been calculated; the CVSS vector string is ( CVSS4.0/AV:N/AC:L/AT:N/
PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N ).
3.2.3 IMPROPER CHECK FOR UNUSUAL OR EXCEPTIONAL CONDITIONS CWE-754
FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allow a remote attacker
to cause a denial of service via a crafted BGP update with a corrupted
attribute 23 (Tunnel Encapsulation).
CVE-2023-38802 has been assigned to this vulnerability. A CVSS v3.1 base score
of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U
/C:N/I:N/A:H ).
3.2.4 TRUNCATION OF SECURITY-RELEVANT INFORMATION CWE-222
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH
before 9.6 and other products, allows remote attackers to bypass integrity
checks such that some packets are omitted from the extension negotiation
message. A client and server may consequently end up with a connection for
which some security features have been downgraded or disabled, aka a Terrapin
attack. This occurs because the SSH Binary Packet Protocol (BPP) implemented by
these extensions mishandles the handshake phase and mishandles use of sequence
numbers.
CVE-2023-48795 has been assigned to this vulnerability. A CVSS v3.1 base score
of 5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U
/C:N/I:H/A:N ).
A CVSS v4 score has also been calculated for CVE-2023-48795 . A base score of
8.2 has been calculated; the CVSS vector string is ( CVSS4.0/AV:N/AC:H/AT:N/
PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N ).
3.2.5 INSUFFICIENT SESSION EXPIRATION CWE-613
Web sessions in the management interface in Palo Alto Networks PAN-OS software
do not expire in certain situations, making it susceptible to unauthorized
access.
CVE-2024-0008 has been assigned to this vulnerability. A CVSS v3.1 base score
of 7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U
/C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce risk:
o (CVE-2023-6789, CVE-2023-6793, CVE-2023-38802, CVE-2024-0008) RUGGEDCOM
APE1808: Contact customer support to receive patch and update information.
o (CVE-2023-48795) RUGGEDCOM APE1808: Currently no fix is available
o (CVE-2023-48795) RUGGEDCOM APE1808: CVE-2023-48795: Customers can resolve
this issue by configuring the in-use SSH profile to contain at least one
cipher and at least one MAC algorithm, which removes support for
CHACHA20-POLY1305 and all Encrypt-then-MAC algorithms available (ciphers
with -etm in the name) in PAN-OS software. See Palo Alto Networks' upstream
documentation https://security.paloaltonetworks.com/CVE-2023-48795 for
additional guidance.
As a general security measure, Siemens recommends protecting network access to
devices with appropriate mechanisms. To operate the devices in a protected IT
environment, Siemens recommends configuring the environment according to
Siemens' operational guidelines for industrial security and following
recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the
Siemens industrial security webpage .
For more information see the associated Siemens security advisory SSA-455250 in
HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities, such as:
o Minimize network exposure for all control system devices and/or systems,
ensuring they are not accessible from the internet .
o Locate control system networks and remote devices behind firewalls and
isolating them from business networks.
o When remote access is required, use more secure methods, such as Virtual
Private Networks (VPNs), recognizing VPNs may have vulnerabilities and
should be updated to the most current version available. Also recognize VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on cisa.gov/ics . Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies .
CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time.
5. UPDATE HISTORY
o April 11, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Siemens
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