Arbitrary file creation via recursive path assignment
Published May 3, 2024 · Updated Aug 2, 2024
Arbitrary file creation in Softing Secure Integration Server 1.22.0.8686 allows remote authenticated users to write server files via OPC UA. The FileDirectory MoveOrCopy rename flow recursively assigns a parent directory path to an uninitialized child File object, linking it to an attacker-chosen Windows path. Exploitation requires high-privilege OPC UA access and earlier chain steps to create and initialize the objects; combined with other flaws, the primitive can stage a DLL for root-context code execution.
Summary
What happened
Arbitrary file creation in Softing Secure Integration Server 1.22.0.8686 allows remote authenticated users to write server files via OPC UA. The FileDirectory MoveOrCopy rename flow recursively assigns a parent directory path to an uninitialized child File object, linking it to an attacker-chosen Windows path. Exploitation requires high-privilege OPC UA access and earlier chain steps to create and initialize the objects; combined with other flaws, the primitive can stage a DLL for root-context code execution.
The record
- CVE
- CVE-2023-39480
- Published
- May 3, 2024
- Updated
- Aug 2, 2024
- Vendor
- Softing Industrial Automation GmbH
- Product
- Secure Integration Server
- Classifications
- CWE-552, T1105
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- May 3, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.22.0.8686
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Pwn2Own ICS Secure Integration Server exploit chainproof of concept · demonstrated
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Reported exploitation
Technologies
Your stack
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Your stack
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