Unauthenticated code execution via allocation-size integer overflow
Published Mar 26, 2020 · Updated Aug 4, 2024
Heap-based buffer overflow in the CODESYS V3 web server before 3.5.15.40 allows remote attackers to crash the runtime or execute code. CmpWebServerHandlerV3 accepts 0xffffffff as a communication-buffer size, and MemGCGetSize adds 0x5c with 32-bit wraparound before allocating a small heap buffer. A subsequent WEB_CLIENT_RUN_SERVICE message copies attacker-controlled data into that undersized buffer; the optional web server must be enabled, but no authentication or user interaction is required.
Summary
What happened
Heap-based buffer overflow in the CODESYS V3 web server before 3.5.15.40 allows remote attackers to crash the runtime or execute code. CmpWebServerHandlerV3 accepts 0xffffffff as a communication-buffer size, and MemGCGetSize adds 0x5c with 32-bit wraparound before allocating a small heap buffer. A subsequent WEB_CLIENT_RUN_SERVICE message copies attacker-controlled data into that undersized buffer; the optional web server must be enabled, but no authentication or user interaction is required.
The record
- CVE
- CVE-2020-10245
- Published
- Mar 26, 2020
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 26, 2020CVE 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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What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- CODESYS V3 web-server integer-overflow proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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