CVE-2020-11810
An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id.
Does this matter?
Lower severity and a low EPSS score (1.65%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 3.7 LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 1.65% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- openvpn/openvpn · debian/debian linux · fedoraproject/fedora
- Source
- cve@mitre.org
References
- https://bugzilla.suse.com/show_bug.cgi?id=1169925Issue Tracking, Third Party Advisory
- https://community.openvpn.net/openvpn/ticket/1272Exploit, Vendor Advisory
- https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225abPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/
- https://patchwork.openvpn.net/patch/1079/Patch, Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2020-11810Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1169925Issue Tracking, Third Party Advisory
- https://community.openvpn.net/openvpn/ticket/1272Exploit, Vendor Advisory
- https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225abPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/
- https://patchwork.openvpn.net/patch/1079/Patch, Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2020-11810Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.