SB2023120533 - VPN client impersonation in Cisco Adaptive Security Appliance and Firepower Threat Defense software
Published: December 5, 2023
Security Bulletin ID
SB2023120533
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Insufficient verification of data authenticity (CVE-ID: CVE-2023-20275)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to impersonate other VPN users.
The vulnerability exists due to improper validation of the packet's inner source IP address after decryption in the AnyConnect SSL VPN feature. A remote user can send specially crafted packets through the tunnel, impersonate another VPN user's IP address and receive return packets.
Remediation
Install update from vendor's website.