Race Condition Affecting openvpn-debuginfo package, versions <0:2.4.9-1.23.amzn1


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.34% (72nd percentile)

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  • Snyk IDSNYK-AMZN201803-OPENVPNDEBUGINFO-1723029
  • published27 Sept 2021
  • disclosed27 Apr 2020

Introduced: 27 Apr 2020

CVE-2020-11810  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 openvpn-debuginfo to version 0:2.4.9-1.23.amzn1 or higher.
This issue was patched in ALAS-2020-1410.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openvpn-debuginfo package and not the openvpn-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

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 Scores

version 3.1