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CVE-2020-11810
LOW3.7
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.
CVE Details
CVSS v3.1 Score3.7
SeverityLOW
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack VectorNETWORK
ComplexityHIGH
Privileges RequiredNONE
User InteractionNONE
Published4/27/2020
Last Modified11/21/2024
Sourcenvd
Honeypot Sightings0
Affected Products
debian:debian_linuxfedoraproject:fedoraopenvpn:openvpn
Weaknesses (CWE)
CWE-362
References
https://bugzilla.suse.com/show_bug.cgi?id=1169925(cve@mitre.org)
https://community.openvpn.net/openvpn/ticket/1272(cve@mitre.org)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/(cve@mitre.org)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/(cve@mitre.org)
https://patchwork.openvpn.net/patch/1079/(cve@mitre.org)
https://security-tracker.debian.org/tracker/CVE-2020-11810(cve@mitre.org)
https://bugzilla.suse.com/show_bug.cgi?id=1169925(af854a3a-2127-422b-91ae-364da2661108)
https://community.openvpn.net/openvpn/ticket/1272(af854a3a-2127-422b-91ae-364da2661108)
https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab(af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html(af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/(af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/(af854a3a-2127-422b-91ae-364da2661108)
https://patchwork.openvpn.net/patch/1079/(af854a3a-2127-422b-91ae-364da2661108)
https://security-tracker.debian.org/tracker/CVE-2020-11810(af854a3a-2127-422b-91ae-364da2661108)
IOC Correlations
No correlations recorded
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