Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2023-22308
CVE-2023-22308:
SoftEther VPN Server vulnerability analysis and mitigation
Overview
An integer underflow vulnerability (CVE-2023-22308) was discovered in the vpnserver OvsProcessData functionality of SoftEther VPN versions 5.01.9674 and 5.02. The vulnerability was disclosed on October 12, 2023, and affects the OpenVPN protocol implementation in SoftEther VPN, a multi-platform VPN project that provides both server and client code to connect over various VPN protocols (Talos Report).
Technical details
The vulnerability exists in the OpenVPN protocol handling of SoftEther VPN. When processing TCP packets, the server checks for packets starting with '\x00\x0E' to identify OpenVPN traffic. However, in subsequent iterations of packet processing, there's no validation of the packet format, allowing an attacker to send specially crafted packets that can trigger an integer underflow. The vulnerability has been assigned a CVSS v3.1 score of 7.5 (High) with vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H and is classified as CWE-191 (Integer Underflow) (Talos Report).
Impact
When successfully exploited, this vulnerability can lead to a denial of service condition in the VPN server. The attack can cause the server process to crash when attempting to read beyond the allocated buffer space, particularly when the payload hits the guard pages in Linux thread stacks (Talos Report).
Mitigation and workarounds
A patch for this vulnerability was released by the vendor on April 17, 2023. Users are advised to upgrade to the latest version of SoftEther VPN. The fix was implemented through a pull request on the SoftEther VPN GitHub repository (Talos Report).
Additional resources
Source: This report was generated using AI
Free Vulnerability Assessment
Benchmark your Cloud Security Posture
Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.
Get a personalized demo
Ready to see Wiz in action?
“Best User Experience I have ever seen, provides full visibility to cloud workloads.”
David EstlickCISO
“Wiz provides a single pane of glass to see what is going on in our cloud environments.”
Adam FletcherChief Security Officer
“We know that if Wiz identifies something as critical, it actually is.”
Greg PoniatowskiHead of Threat and Vulnerability Management