Privilege escalation in Cisco AnyConnect Secure Mobility Client for Windows
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-1567 CVE-2021-1568 |
| CWE-ID | CWE-427 CWE-789 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Cisco AnyConnect Secure Mobility Client Client/Desktop applications / Other client software |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Insecure DLL loading
EUVDB-ID: #VU54177
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-1567
CWE-ID:
CWE-427 - Uncontrolled Search Path Element
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the application loads DLL libraries in an insecure manner. A local user can place a specially crafted .dll file on system, if the VPN Posture (HostScan) Module is installed on the AnyConnect client, and execute arbitrary code with SYSTEM privileges.
The vulnerability affects Cisco AnyConnect Secure Mobility Client for Windows.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco AnyConnect Secure Mobility Client: 4.9.00086 - 4.10.00093
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-pos-dll-ff8j6dFv
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx52084
http://www.coresecurity.com/core-labs/advisories/cisco-anyconnect-posture-hostscan-security-service-bypass/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Uncontrolled Memory Allocation
EUVDB-ID: #VU54178
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-1568
CWE-ID:
CWE-789 - Uncontrolled Memory Allocation
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform denial of service (DoS) attack.
The vulnerability exists due to uncontrolled memory allocation. A local user can crash the VPN Agent service when the affected application is launched.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco AnyConnect Secure Mobility Client: 4.9.00086 - 4.10.00093
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-hMhyDfb8
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx09155
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
