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AUSCERT External Security Bulletin Redistribution
ESB-2022.2352
Advisory (icsa-22-132-02) Mitsubishi Electric MELSOFT iQ AppPortal
13 May 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSOFT iQ AppPortal
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-23943 CVE-2022-22720 CVE-2022-0778
CVE-2021-44790 CVE-2021-34798 CVE-2021-26691
CVE-2021-3711 CVE-2020-13938
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-132-02
Comment: CVSS (Max): 9.8 CVE-2022-23943 (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-22-132-02)
Mitsubishi Electric MELSOFT iQ AppPortal
Original release date: May 12, 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: Mitsubishi Electric
o Equipment: MELSOFT iQ AppPortal
o Vulnerabilities: Missing Authorization, Out-of-bounds Write, NULL Pointer
Dereference, Classic Buffer Overflow, HTTP Request Smuggling, Infinite Loop
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in a
denial-of-service condition, malicious program execution, information
disclosure, information tampering, or authentication bypass.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following MELSOFT iQ AppPortal versions using the vulnerable open-source
software used by VisualSVN Server, are affected:
o MELSOFT iQ AppPortal (SW1DND-IQAPL-M): Versions 1.00A through 1.26C
3.2 VULNERABILITY OVERVIEW
3.2.1 MISSING AUTHORIZATION CWE-862
Apache HTTP Server Versions 2.4.0 to 2.4.46 allow unprivileged local users to
stop httpd on Windows.
CVE-2020-13938 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:N/
I:N/A:H ).
3.2.2 OUT-OF-BOUNDS WRITE CWE-787
In Apache HTTP Server Versions 2.4.0 to 2.4.46 a specially crafted
SessionHeader sent by an origin server could cause a heap overflow.
CVE-2021-26691 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 ).
3.2.3 NULL POINTER DEREFERENCE CWE-476
Malformed requests may cause the server to dereference a NULL pointer. This
issue affects Apache HTTP Server Versions 2.4.48 and earlier.
CVE-2021-34798 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).
3.2.4 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
An attacker who can present SM2 content for decryption to an application could
cause data to overflow the buffer up to a maximum of 62 bytes, altering the
contents of other data held after the buffer or causing the application to
crash. The location of the buffer is application dependent but is typically
heap allocated. Fixed in OpenSSL 1.1.1 (Affected 1.1.1-1.1.1k). This issue is
detailed further in CVE-2021-3711 .
CVE-2021-3711 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 ).
3.2.5 OUT-OF-BOUNDS WRITE CWE-787
A carefully crafted request body can cause a buffer overflow in the mod_lua
multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team
is not aware of an exploit for this vulnerability, though it might be possible
to craft one. This issue affects Apache HTTP Server Versions 2.4.51 and
earlier.
CVE-2021-44790 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 ).
3.2.6 INCONSISTENT INTERPRETATION OF HTTP REQUESTS ('HTTP REQUEST SMUGGLING')
CWE-444
Apache HTTP Server Versions 2.4.52 and earlier fail to close inbound
connections when errors are encountered discarding the request body, exposing
the server to HTTP request smuggling.
CVE-2022-22720 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 ).
3.2.7 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability in mod_sed of Apache HTTP Server allows an
attacker to overwrite heap memory with possibly attacker provided data. This
issue affects Apache HTTP Server 2.4 Versions 2.4.52 and earlier.
CVE-2022-23943 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 ).
3.2.8 LOOP WITH UNREACHABLE EXIT CONDITION ('INFINITE LOOP') CWE-835
The BN_mod_sqrt() function, which computes a modular square root, contains a
bug that can cause it to loop for non-prime moduli. An attacker can use a
self-signed certificate to trigger the loop during verification of the
certificate signature. This issue, which is further detailed in CVE-2022-0778,
affects OpenSSL Versions 1.0.2, 1.1.1, and 3.0.xxx
CVE-2022-0778 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Mitsubishi Electric notified CISA of these vulnerabilities.
4. MITIGATIONS
Mitsubishi Electric recommends the following:
o Update to 1.29F or later . Unzip the downloaded file (zip format) and
execute the file "setup.exe."
o Restrict network access to the computer running this product so it can be
accessed only from trusted networks or hosts.
o Minimize user privilege for product users.
o Install an antivirus software in the personal computer that runs this
product.
o Please follow the safety precautions in the operating manual for the
product.
For more information see Mitsubishi Electric's advisory 2022-003
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 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.
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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