CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
93.5%
--------- Begin Update B Part 1 of 2 ---------
--------- End Update B Part 1 of 2 ---------
This updated advisory is a follow-up to the advisory update titled ICSA-21-012-03 Siemens JT2Go and Teamcenter Visualization (Update A) that was published February 9, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of these vulnerabilities could lead to arbitrary code execution.
--------- Begin Update B Part 1 of 2 ---------
The following products are affected:
CVE-2020-26989, CVE-2020-26990, and CVE-2020-28383 were moved to SSA-663999 and ICSA-21-040-06. CVE-2020-26991 was moved to SSA-695540 and ICSA-21-147-04
--------- End Update B Part 2 of 2 ---------
Affected applications lack proper validation of user-supplied data when parsing JT files. A crafted JT file can trigger a type of confusion condition. An attacker can leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26980 has been assigned to this vulnerability. A CVSS v3 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).
When opening a specially crafted XML file, the application could disclose arbitrary files to remote attackers. This is because of the passing of specially crafted content to the underlying XML parser without taking proper restrictions such as prohibiting an external DTD.
CVE-2020-26981 has been assigned to this vulnerability. A CVSS v3 base score of 5.6 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:L).
Affected applications lack proper validation of user-supplied data when parsing CG4 and CGM files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26982 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing PDF files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26983 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing JT files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26984 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing RGB and SGI files. This could result in a heap-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26985 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing JT files. This could lead to a heap-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26986 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing TGA files. This could lead to a heap-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26987 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing PAR files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26988 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing CGM files. This could lead to a stack-based buffer overflow while trying to copy to a buffer during font string handling. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26992 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing CGM files. This could lead to a stack-based buffer overflow while trying to copy to a buffer during font index handling. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26993 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing PCX files. This could result in a heap-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26994 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing SGI and RGB files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26995 has been assigned to this vulnerability. A CVSS v3 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).
Affected applications lack proper validation of user-supplied data when parsing CG4 files. This could result in a memory access past the end of an allocated buffer. An attacker could leverage this vulnerability to execute code in the context of the current process.
CVE-2020-26996 has been assigned to this vulnerability. A CVSS v3 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).
Francis Provencher {PRL} and rgod, working with Trend Microโs Zero Day Initiative, and Carsten Eiram from Risk Based Security, reported these vulnerabilities.
Siemens recommends the following:
For additional information refer to SSA-622830, SSA-663999, and SSA-695540
Siemens strongly 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 Siemensโ operational guidelines for Industrial Security and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at: <https://www.siemens.com/Industrialsecurity>
CISA recommends users take the following measures to protect themselves from social engineering attacks:
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.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 us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01BโTargeted 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. These vulnerabilities are not exploitable remotely.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26383
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26980
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26981
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26982
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26983
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26984
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26985
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26986
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26987
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26988
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26989
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26990
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26991
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26992
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26993
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26994
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26995
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26996
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
93.5%