#VU27362 XML injection in ABB Central Licensing System (CLS) - CVE-2020-8475

Vulnerability identifier: #VU27362

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8475

CWE-ID: CWE-91

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ABB Central Licensing System (CLS)
Server applications / Other server solutions

Vendor: ABB

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation in the Central Licensing System. A remote unauthenticated attacker can send a specially crafted request containing malformed XML and cause a denial of service condition on the target system.

This vulnerability affects the following ABB CLS products:

• ABB Ability System 800xA and related system extensions: Versions 5.1, 6.0, 6.1
• Compact HMI: Versions 5.1, 6.0
• Control Builder Safe: Versions 1.0, 1.1, 2.0
• ABB Ability Symphony Plus – S+ Operations: Versions 3.0 to 3.2
• ABB Ability Symphony Plus – S+ Engineering: Versions 1.1 to 2.2
• Composer Harmony: Versions 5.1, 6.0, 6.1
• Composer Melody (incl. SPE for Melody 1.0 SPx): Versions 5.3, 6.1, 6.2, 6.3
• Harmony OPC Server (HAOPC): Standalone Versions 6.0, 6.1, 7.0
• ABB Ability System 800xA / Advant OCS Control Builder A: Versions 1.3, 1.4
• Advant OCS AC 100 OPC Server: Versions 5.1, 6.0, 6.1
• Composer CTK: Versions 6.1, 6.2
• AdvaBuild: Versions 3.7 SP1, 3.7 SP2
• OPC Server MOD 300 (non-800xA): Version 1.4
• OPC Data Link: Versions 2.1, 2.2
• ABB Ability Knowledge Manager: Versions 8.0, 9.0, 9.1
• ABB Ability Manufacturing Operations Management: Versions 1812, 1909

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

ABB Central Licensing System (CLS): All versions

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External links
https://applied-risk.com/assets/uploads/whitepapers/AR2020002-ABB-800xA-MultipleVulnerabilities.pdf
https://search.abb.com/library/Download.aspx?DocumentID=2PAA121230&LanguageCode=en&DocumentPartId=&Action=Launch
https://search.abb.com/library/Download.aspx?DocumentID=2PAA121231&LanguageCode=en&DocumentPartId=&Action=Launch

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.