PT-2023-4938 · Softether · Softether Vpn

Lilith >_> · Published 2023-06-30 · Updated 2023-10-18 · CVE-2023-27395

Positive Technologies (AI Summary)

CVSS v3.1

9.0

Critical

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions SoftEther VPN versions 4.41-9782-beta through 5.02

Description A heap-based buffer overflow vulnerability exists in the WpcParsePacket() functionality. This issue can be triggered by a specially crafted network packet, potentially leading to arbitrary code execution. An attacker can exploit this vulnerability by performing a man-in-the-middle attack.

Recommendations For versions 4.41-9782-beta through 5.02, consider disabling the WpcParsePacket() function as a temporary workaround until a patch is available. Restrict access to the vpnserver functionality to minimize the risk of exploitation. Avoid using the vulnerable functionality in the affected API endpoints until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

BDU:2023-05451

CVE-2023-27395

Affected Products

Softether Vpn

References · 7

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2023-1735 · Exploit
• https://bdu.fstec.ru/vul/2023-05451 · Security Note
• https://softether.org/9-about/News/904-SEVPN202301 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-27395 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-27395 · Security Note
• https://twitter.com/VulmonFeeds/status/1712543360181829675 · Twitter Post
• https://t.me/cibsecurity/72183 · Telegram Post