Code execution via malformed DNS label parsing
Published Apr 22, 2021 · Updated Aug 4, 2024
Out-of-bounds write in Siemens Nucleus NET before 5.2 and affected APOGEE and TALON controllers allows code execution or service crashes. DNS domain-name label parsing fails to validate names in received DNS responses and writes beyond the allocated structure when parsing malformed labels. A privileged network position is required to deliver a malicious response; successful exploitation runs code in the current process or crashes it.
Summary
What happened
Out-of-bounds write in Siemens Nucleus NET before 5.2 and affected APOGEE and TALON controllers allows code execution or service crashes. DNS domain-name label parsing fails to validate names in received DNS responses and writes beyond the allocated structure when parsing malformed labels. A privileged network position is required to deliver a malicious response; successful exploitation runs code in the current process or crashes it.
The record
- CVE
- CVE-2020-15795
- Published
- Apr 22, 2021
- Updated
- Aug 4, 2024
- Vendor
- Siemens
- Product
- TALON TC Compact (BACnet)
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 22, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=All versions < V3.5.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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