Cisco AnyConnect Secure Mobility Client on Windows Interprocess Communication toctou

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

A vulnerability was found in Cisco AnyConnect Secure Mobility Client on Windows (Network Encryption Software) (unknown version) and classified as critical. This issue affects an unknown code block of the component Interprocess Communication Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-367. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the DLL loading mechanism of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected device if the VPN Posture (HostScan) Module is installed on the AnyConnect client. This vulnerability is due to a race condition in the signature verification process for DLL files that are loaded on an affected device. An attacker could exploit this vulnerability by sending a series of crafted interprocess communication (IPC) messages to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected device with SYSTEM privileges. To exploit this vulnerability, the attacker must have valid credentials on the Windows system.

The weakness was released 06/17/2021 as cisco-sa-anyconnect-pos-dll-ff8j6dFv. The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2021-1567 since 11/13/2020. The exploitation is known to be difficult. The attack may be initiated remotely. The requirement for exploitation is a simple authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/21/2021).

Upgrading eliminates this vulnerability.

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CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Race condition
CWE: CWE-367
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: tools.cisco.com

Timelineinfoedit

11/13/2020 CVE assigned
06/17/2021 +215 days Advisory disclosed
06/17/2021 +0 days VulDB entry created
06/21/2021 +4 days VulDB last update

Sourcesinfoedit

Vendor: https://www.cisco.com/

Advisory: cisco-sa-anyconnect-pos-dll-ff8j6dFv
Status: Confirmed

CVE: CVE-2021-1567 (🔒)

Entryinfoedit

Created: 06/17/2021 08:06 AM
Updated: 06/21/2021 08:55 AM
Changes: (1) source_cve_cna
Complete: 🔍

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