Remote code execution via nested DHCPv6 relays
Published Apr 11, 2023 · Updated Jan 23, 2025
Heap overflow in Microsoft Windows Server DHCPv6 allows adjacent remote attackers to execute code through crafted Relay-forward messages. ProcessRelayForwardMessage in dhcpssvc.dll stores per-hop data in a 32-entry heap array but does not reject more than 32 nested relays, causing an out-of-bounds write. The DHCP Server service must be running and reachable through UDP port 547 from an adjacent network; successful exploitation runs code as NETWORK SERVICE.
Summary
What happened
Heap overflow in Microsoft Windows Server DHCPv6 allows adjacent remote attackers to execute code through crafted Relay-forward messages. ProcessRelayForwardMessage in dhcpssvc.dll stores per-hop data in a 32-entry heap array but does not reject more than 32 nested relays, causing an out-of-bounds write. The DHCP Server service must be running and reachable through UDP port 547 from an adjacent network; successful exploitation runs code as NETWORK SERVICE.
The record
- CVE
- CVE-2023-28231
- Published
- Apr 11, 2023
- Updated
- Jan 23, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1190
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 11, 2023CVE publishedPublication date reported by the CVE source.
- Jan 23, 2025Record 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=10.0.17763.0 <10.0.17763.4252
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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Public exploit references
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Technologies
Your stack
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Your stack
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