Description
An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.
CVSS Metrics
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Attack Vector
- network
- Complexity
- high
- Privileges
- none
- User Action
- none
- Scope
- unchanged
- Confidentiality
- none
- Integrity
- none
- Availability
- low
- Weaknesses
- CWE-362
Metadata
- Primary Vendor
- OPENVPN
- Published
- 4/27/2020
- Last Modified
- 11/21/2024
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
openvpn : openvpndebian : debian_linuxdebian : debian_linuxdebian : debian_linuxfedoraproject : fedorafedoraproject : fedora
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