// For flags

CVE-2021-34788

Cisco AnyConnect Secure Mobility Client for Linux and Mac OS with VPN Posture (HostScan) Module Shared Library Hijacking Vulnerability

Severity Score

7.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

A vulnerability in the shared library loading mechanism of Cisco AnyConnect Secure Mobility Client for Linux and Mac OS could allow an authenticated, local attacker to perform a shared library 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 shared library 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 root privileges. To exploit this vulnerability, the attacker must have a valid account on the system.

Una vulnerabilidad en el mecanismo de carga de la biblioteca compartida de Cisco AnyConnect Secure Mobility Client para Linux y Mac OS podría permitir a un atacante local autenticado llevar a cabo un ataque de secuestro de la biblioteca compartida en un dispositivo afectado si el módulo VPN Posture (HostScan) está instalado en el cliente AnyConnect. Esta vulnerabilidad es debido a una condición de carrera en el proceso de verificación de firmas para los archivos de bibliotecas compartidas que son cargadas en un dispositivo afectado. Un atacante podría explotar esta vulnerabilidad mediante el envío de una serie de mensajes de comunicación interproceso (IPC) diseñados al proceso AnyConnect. Una explotación con éxito podría permitir al atacante ejecutar código arbitrario en el dispositivo afectado con privilegios root. Para explotar esta vulnerabilidad, el atacante debe tener una cuenta válida en el sistema

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2021-06-15 CVE Reserved
  • 2021-10-06 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-11-07 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Anyconnect Secure Mobility Client
Search vendor "Cisco" for product "Anyconnect Secure Mobility Client"
 < 4.10.03104
Search vendor "Cisco" for product "Anyconnect Secure Mobility Client" and version " < 4.10.03104"
-
Affected
in Apple
Search vendor "Apple"
 Macos
Search vendor "Apple" for product "Macos"
--
Safe
Cisco
Search vendor "Cisco"
 Anyconnect Secure Mobility Client
Search vendor "Cisco" for product "Anyconnect Secure Mobility Client"
 < 4.10.03104
Search vendor "Cisco" for product "Anyconnect Secure Mobility Client" and version " < 4.10.03104"
-
Affected
in Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
--
Safe