Unauthenticated event processing crash via buffer over-read
Published Jul 6, 2023 · Updated Aug 2, 2024
Buffer over-read in Milesight UR32L 32.3.0.5 eventcore allows remote attackers to crash the process with a crafted UDP request. The recv_data_thread function receives 511 bytes into a 512-byte stack buffer, but memcpy then reads 2,048 bytes from that buffer, crosses the thread stack boundary, and raises SIGSEGV. No authentication or user interaction is required; one datagram to UDP port 9001 interrupts event-triggered actions handled by eventcore.
Summary
What happened
Buffer over-read in Milesight UR32L 32.3.0.5 eventcore allows remote attackers to crash the process with a crafted UDP request. The recv_data_thread function receives 511 bytes into a 512-byte stack buffer, but memcpy then reads 2,048 bytes from that buffer, crosses the thread stack boundary, and raises SIGSEGV. No authentication or user interaction is required; one datagram to UDP port 9001 interrupts event-triggered actions handled by eventcore.
The record
- CVE
- CVE-2023-23571
- Published
- Jul 6, 2023
- Updated
- Aug 2, 2024
- Vendor
- Milesight
- Product
- UR32L
- Classifications
- CWE-126, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 6, 2023CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=v32.3.0.5
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.
Public exploit references
- Cisco Talos UDP eventcore crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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