medium
4.3
CWE
362
Advisory Published
CVE Published
Updated

CVE-2020-11810: Race Condition

First published: Mon Apr 27 2020(Updated: )

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.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Openvpn Openvpn>=2.4.0<2.4.9
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=30
Fedoraproject Fedora=32
debian/openvpn
2.5.1-3
2.6.3-1+deb12u2
2.6.12-1
ubuntu/openvpn<2.4.4-2ubuntu1.5
2.4.4-2ubuntu1.5
ubuntu/openvpn<2.4.7-1ubuntu2.20.04.2
2.4.7-1ubuntu2.20.04.2
ubuntu/openvpn<2.4.9-1
2.4.9-1
>=2.4.0<2.4.9
=8.0
=9.0
=10.0
=30
=32

Remedy

https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab

Remedy

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/

Remedy

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/

Remedy

https://patchwork.openvpn.net/patch/1079/

Remedy

https://github.com/OpenVPN/openvpn/commit/f7b318f811bb43c0d3aa7f337ec6242ed2c33881

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-11810?

    CVE-2020-11810 is a vulnerability discovered in OpenVPN 2.4.x before 2.4.9 that allows an attacker to inject a data channel packet using a victim's peer-id.

  • How severe is CVE-2020-11810?

    CVE-2020-11810 has a severity level of medium with a CVSS score of 3.7.

  • Which software versions are affected by CVE-2020-11810?

    The vulnerability affects OpenVPN versions 2.4.x before 2.4.9.

  • How can I mitigate the vulnerability in OpenVPN?

    To mitigate the vulnerability, update OpenVPN to version 2.4.9 or later.

  • Where can I find more information about CVE-2020-11810?

    You can find more information about CVE-2020-11810 in the following references: [Reference 1](https://bugzilla.suse.com/show_bug.cgi?id=1169925), [Reference 2](https://community.openvpn.net/openvpn/ticket/1272), [Reference 3](https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab).

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