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AUSCERT External Security Bulletin Redistribution
ESB-2021.1358
Advisory (icsa-20-070-01) Siemens and PKE SiNVR/SiVMS Video Server
21 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens and PKE SiNVR/SiVMS Video Server
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-19299 CVE-2019-19298 CVE-2019-19297
CVE-2019-19296 CVE-2019-19295 CVE-2019-19294
CVE-2019-19293 CVE-2019-19292 CVE-2019-19291
CVE-2019-19290
Reference: ESB-2021.1240
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-070-01
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ICS Advisory (ICSA-20-070-01)
Siemens and PKE SiNVR/SiVMS Video Server (Update A)
Original release date: April 20, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
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o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendors: Siemens and PKE
o Equipment: SiNVR/SiVMS Video Server
o Vulnerabilities: Cleartext Storage in a File or on Disk, Path Traversal,
Improper Input Validation, Weak Cryptography for Passwords
- --------- End Update A Part 1 of 4 ---------
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-20-070-01 Siemens SiNVR 3 that was published March 10, 2020, on the ICS
webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in unauthorized
access to server data and possible denial-of-service conditions.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
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The following versions of SiNVR/SiVMS Video Server, a video management
solution, are affected:
o [S: SiNVR 3 Central Control Server (CCS): All versions :S] Moved to
SSA-761844 and ICSA-21-103-10
o SiNVR/SiVMS Video Server: All versions prior to v5.0.0
o SiNVR/SiVMS Video Server: v5.0.0 and later is affected by CVE-2019-19298
and CVE-2019-19299
- --------- End Update A Part 2 of 4 ---------
4.2 VULNERABILITY OVERVIEW
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CVE-2019-19290 , CVE-2019-19292 , CVE-2019-19293 , CVE-2019-19294 , and
CVE-2019-19295 have been moved to SSA-761844 and ICSA-21-103-10
4.2.1 CLEARTEXT STORAGE IN A FILE OR ON DISK CWE-313
The FTP services of the SiNVR/SiVMS Video Server maintain log files that store
login credentials in cleartext. In configurations where the FTP service is
enabled, authenticated remote attackers could extract login credentials of
other users of the service.
CVE-2019-19291 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:H/I:N/A:N ).
4.2.2 PATH TRAVERSAL CWE-22
Successful exploitation could allow an authenticated remote attacker to access
and download arbitrary files from the server if the FTP services are enabled.
CVE-2019-19296 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:H/I:H/A:N ).
4.2.3 PATH TRAVERSAL CWE-22
Successful exploitation could allow an authenticated remote attacker to access
and download arbitrary files from the server.
CVE-2019-19297 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
4.2.4 IMPROPER INPUT VALIDATION CWE-20
Successful exploitation could allow an unauthenticated remote attacker to cause
a denial-of-service condition by sending malformed HTTP requests.
CVE-2019-19298 has been assigned to this vulnerability. A CVSS v3 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 ).
4.2.5 USE OF A BROKEN OR RISKY CRYPTOGRAPHIC ALGORITHM CWE-327
The affected product contains weak cryptography when exposing device passwords.
This could allow an unauthenticated remote attacker to read and decrypt the
passwords and conduct further attacks.
CVE-2019-19299 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
- --------- End Update A Part 3 of 4 ---------
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Information Technology
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
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Siemens and PKE recommend users to update to v5.0.0 or later .
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Apply ACL/firewall configuration on the video servers to ensure only
legitimate systems can access the configured server ports.
o Harden all systems accordingly to prevent unauthorized access.
o Consider applying encryption and authentication on the network (e.g., via
TLS on application level or via IPSec on host level).
o Disable the two FTP services of the Video Server.
As a general security measure Siemens strongly recommends protecting network
access to affected products with appropriate mechanisms. Siemens advises users
to follow recommended security practices to run the devices in a protected IT
environment.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information on these vulnerabilities and more detailed mitigation
instructions, please see Siemens security advisory SSA-844761 and PKE security
advisory .
- --------- End Update A Part 4 of 4 ---------
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
o Exercise principles of least privilege.
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 us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their 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 unsolicited attachments in 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 exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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