SB2021050617 - Multiple vulnerabilities in Cisco AnyConnect Secure Mobility Client
Published: May 6, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Input validation error (CVE-ID: CVE-2021-1519)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to overwrite VPN profiles on the target device.
The vulnerability exists due to insufficient validation of user-supplied input in the interprocess communication (IPC) channel. A local user can send a specially crafted IPC message to the AnyConnect process and modify VPN profile files.
2) Creation of Temporary File With Insecure Permissions (CVE-ID: CVE-2021-1429)
CWE-ID: CWE-378 - Creation of Temporary File With Insecure Permissions
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform an executable hijacking attack.
The vulnerability exists due to a temporary file with insecure permissions is created during the uninstall process. A local user can overwrite the temporary file before it is accessed for execution and execute arbitrary code on the target device.
3) Insecure DLL loading (CVE-ID: CVE-2021-1428)
CWE-ID: CWE-427 - Uncontrolled Search Path Element
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to the application loads a DLL file from a user-writable directory. A local user can place a specially crafted .dll file and execute arbitrary code on victim's system.
Remediation
Install update from vendor's website.