An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.

An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.

SoftEther VPN provided by University of Tsukuba SoftEther VPN Project and PacketiX VPN provided by SoftEther Corporation contain multiple vulnerabilities listed below in VPN Client function, and Dynamic DNS Client function included in the VPN server.<ul><li>Heap-based buffer overflow (CWE-122) - CVE-2023-27395</li><li>Integer overflow or wraparound (CWE-190) - CVE-2023-22325</li><li>Exposure of resource to wrong sphere (CWE-668) - CVE-2023-32275</li><li>Improper access control (CWE-284) - CVE-2023-27516</li><li>Channel accessible by non-endpoint (CWE-300) - CVE-2023-32634</li><li>Use of uninitialized resource (CWE-908) - CVE-2023-31192</li></ul>Lilith of Cisco Talos of Cisco Systems, Inc., United States of America reported these vulnerabilities to the developer and coordinated. The developer reported these vulnerabilities to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.