Cisco AnyConnect VPN Server DoS Vulnerability Could Lead to Valid Session Handler Brute-Forcing

CVE-2024-20513
5.8MEDIUM

Key Information

Vendor
Cisco
Status
Cisco Meraki Mx Firmware
Vendor
CVE Published:
2 October 2024

Badges

👾 Exploit Exists

Summary

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition for targeted users of the AnyConnect service on an affected device. This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.

Affected Version(s)

Cisco Meraki MX Firmware =

CVSS V3.1

Score:
5.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published.

  • Vulnerability Reserved.

  • 👾

    Exploit exists.

Collectors

NVD DatabaseMitre Database
.