ID CVE-2020-11810
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:a:openvpn:openvpn:2.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:-:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:-:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:alpha1:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:alpha1:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:alpha2:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:alpha2:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.7:*:*:*:*:*:*:*
  • cpe:2.3:a:openvpn:openvpn:2.4.8:*:*:*:*:*:*:*
    cpe:2.3:a:openvpn:openvpn:2.4.8:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
CVSS
Base: 4.3 (as of 12-05-2022 - 20:14)
Impact:
Exploitability:
CWE CWE-362
CAPEC
  • Leveraging Race Conditions
    The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with his version and cause the system to read the malicious file.
  • Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
    This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.
Access
VectorComplexityAuthentication
NETWORK MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
NONE NONE PARTIAL
cvss-vector via4 AV:N/AC:M/Au:N/C:N/I:N/A:P
refmap via4
confirm
fedora
  • FEDORA-2020-969414e05b
  • FEDORA-2020-c1cb4ebcd9
misc https://security-tracker.debian.org/tracker/CVE-2020-11810
Last major update 12-05-2022 - 20:14
Published 27-04-2020 - 15:15
Last modified 12-05-2022 - 20:14
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