Code execution via DNS pointer-offset overwrite
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 man-in-the-middle attackers to execute code. DNS record decompression accepts out-of-range pointer offsets and writes past the end of its allocated structure while parsing malformed responses. A privileged network position capable of supplying those responses is required; the overwrite can also crash the current process.
Summary
What happened
Out-of-bounds write in Siemens Nucleus NET before 5.2 and affected APOGEE and TALON controllers allows man-in-the-middle attackers to execute code. DNS record decompression accepts out-of-range pointer offsets and writes past the end of its allocated structure while parsing malformed responses. A privileged network position capable of supplying those responses is required; the overwrite can also crash the current process.
The record
- CVE
- CVE-2020-27009
- Published
- Apr 22, 2021
- Updated
- Aug 4, 2024
- Vendor
- Siemens
- Product
- TALON TC Compact (BACnet)
- Classifications
- CWE-787, CWE-823, T1203
- 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All versions < V3.5.5
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
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Technologies
Your stack
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Your stack
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