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AUSCERT External Security Bulletin Redistribution
ESB-2022.4036
Advisory (icsa-22-223-03) Schneider Electric EcoStruxure, EcoStruxure
Process Expert, SCADAPack RemoteConnect for x70
12 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric EcoStruxure
EcoStruxure Process Expert
SCADAPack
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2022-26507 CVE-2021-21830 CVE-2021-21829
CVE-2021-21828 CVE-2021-21827 CVE-2021-21826
CVE-2021-21825 CVE-2021-21815 CVE-2021-21814
CVE-2021-21813 CVE-2021-21812 CVE-2021-21811
CVE-2021-21810
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-223-03
Comment: CVSS (Max): 9.8 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-22-223-03)
Schneider Electric EcoStruxure, EcoStruxure Process Expert, SCADAPack
RemoteConnect for x70
Original release date: August 11, 2022
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
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Schneider Electric
o Equipment: EcoStruxure, EcoStruxure Process Expert, SCADAPack RemoteConnect
for x70
o Vulnerabilities: Heap-based Buffer Overflow, Wrap or Wraparound, Classic
Buffer Overflow, Out-of-bounds Write
2. RISK EVALUATION
The successful exploitation of these vulnerabilities on the affected products
could lead to the execution of malicious files, which could result in code
execution with elevated privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Schneider Electric reported these vulnerabilities affect the following products
using AT&T Labs Compressor (XMill) and Decompressor (XDemill):
o EcoStruxure Control Expert: All versions (including former Unity Pro) prior
to V15.1 HF001
o EcoStruxure Process Expert: All versions (including former HDCS) prior to
V2021
o SCADAPack RemoteConnect for x70: All versions prior to R2.7.3
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
A memory corruption vulnerability exists in the XML-parsing ParseAttribs
functionality of AT&T Labs' Xmill 0.7. A specially crafted XML file can lead to
a heap buffer overflow. An attacker can provide a malicious file to trigger
this vulnerability.
CVE-2021-21810 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.2 HEAP-BASED BUFFER OVERFLOW CWE-122
A heap-based buffer overflow vulnerability exists in the XML Decompression.
PlainTextUncompressor::UncompressItem functionality of AT&T Labs' Xmill 0.7. A
specially crafted XMI file could lead to remote code execution. An attacker
could provide a malicious file to trigger this vulnerability.
CVE-2021-21825 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.3 HEAP-BASED BUFFER OVERFLOW CWE-122
A heap-based buffer overflow vulnerability exists in the XML Decompression
EnumerationUncompressor::UncompressItem functionality of AT&T Labs' Xmill 0.7.
A specially crafted XMI file can lead to remote code execution. An attacker can
provide a malicious file to trigger this vulnerability.
CVE-2021-21829 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.4 HEAP-BASED BUFFER OVERFLOW CWE-122
A heap-based buffer overflow vulnerability exists in the XML Decompression
LabelDict::Load functionality of AT&T Labs' Xmill 0.7. A specially crafted XML
file can lead to remote code execution. An attacker can provide a malicious
file to trigger this vulnerability.
CVE-2021-21830 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.5 INTEGER UNDERFLOW (WRAP OR WRAPAROUND) CWE-191
A memory corruption vulnerability exists in the XML-parsing CreateLabelOrAttrib
functionality of AT&T Labs' Xmill 0.7. The product subtracts one value from
another such that the result is less than the minimum allowable integer value,
which produces a value not equal to the correct result.
CVE-2021-21811 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.6 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
A stack-based buffer overflow vulnerability exists in the command-line-parsing
HandleFileArg functionality of AT&T Labs' Xmill 0.7. Within the function
HandleFileArg the argument filepattern is under control of the user who passes
it in from the command line. filepattern is passed directly to strcpy copying
the path provided by the user into a static sized buffer without any length
checks resulting in a stack-buffer overflow. An attacker can provide malicious
input to trigger these vulnerabilities.
CVE-2021-21812 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).
3.2.7 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
Within the function HandleFileArg, the argument filepattern is under control of
the user who passes it in from the command line. filepattern is passed directly
to memcpy copying the path provided by the user into a staticly sized buffer
without any length checks resulting in a stack-buffer overflow.
CVE-2021-21813 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).
3.2.8 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
Within the function HandleFileArg the argument filepattern is under control of
the user who passes it in from the command line. filepattern is passed directly
to strlen to determine the ending location of the char* passed in by the user,
no checks are done to see if the passed in char* is longer than the staticly
sized buffer data is memcpy'd into, but after the memcpy a null byte is written
to what is assumed to be the end of the buffer to terminate the char*, but
without length checks, this null write occurs at an arbitrary offset from the
buffer. An attacker can provide malicious input to trigger this vulnerability.
CVE-2021-21814 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).
3.2.9 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
A stack-based buffer overflow vulnerability exists in the command-line-parsing
HandleFileArg functionality of AT&T Labs' Xmill 0.7. Within the function
HandleFileArg the argument filepattern is under control of the user who passes
it in from the command line. filepattern is passed directly to strcpy copying
the path provided by the user into a staticly sized buffer without any length
checks resulting in a stack-buffer overflow. An attacker can provide malicious
input to trigger this vulnerability.
CVE-2021-21815 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).
3.2.10 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
A heap-based buffer overflow vulnerability exists in the XML Decompression
DecodeTreeBlock functionality of AT&T Labs Xmill 0.7. Within `DecodeTreeBlock,`
which is called during the decompression of an XMI file, a UINT32 is loaded
from the file and used as trusted input as the length of a buffer.
CVE-2021-21826 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.11 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
A heap-based buffer overflow vulnerability exists in the XML Decompression
DecodeTreeBlock functionality of AT&T Labs Xmill 0.7. Within `DecodeTreeBlock`
which is called during the decompression of an XMI file, a UINT32 is loaded
from the file and used as trusted input as the length of a buffer. An attacker
can provide a malicious file to trigger this vulnerability.
CVE-2021-21827 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.12 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
In the command-line-parsing HandleFileArg functionality of AT&T Labs' Xmill
0.7, an attacker could trigger the vulnerability by using a specially crafted
command-line argument that can lead to code execution.
CVE-2021-21828 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.13 OUT-OF-BOUNDS READ CWE-125
A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&
T Labs Xmill 0.7. A crafted input file could lead to remote code execution.
CVE-2022-26507 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.3 BACKGROUND
CRITICAL INFRASTRUCTURE SECTORS: Multiple
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
Carl Hurd of Cisco Talos and Uri Katz of Claroty Research reported these
vulnerabilities.
4. MITIGATIONS
AT&T Labs have stated this software is longer supported and recommends vendors
to move away from using it.
Schneider Electric has released the following version updates to mitigate these
vulnerabilities:
o EcoStruxure Control Expert V15.1 HF001 or later .
o EcoStruxure Process Expert V2021 or later .
o SCADAPack RemoteConnect for R2.7.3 or later (Users no longer need to update
the RemoteConnect application when a Control Expert update is present.)
Schneider Electric also recommends users take specific measures:
o Securely store the project files and restrict access to trusted users.
o Use secure communication channels when exchanging files over the network,.
o Only open project files received from trusted sources.
o Compute a hash of the project files and regularly check the consistency of
this hash to verify integrity before usage.
o Harden the workstation running EcoStruxure Control Expert or Unity Pro.
o Users using Unity Pro should consider migrating to EcoStruxure Control
Expert.
o Harden the workstation running EcoStruxure Process Expert.
o Harden the workstation running SCADAPackRemoteConnect for x70
See the Schneider Electric Security Notification, number SEVD-2021-222-02 for
more information.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure 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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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 . 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 cisa.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.
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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