SB2021120713 - Multiple vulnerabilities in SonicWal SMA 100 products
Published: December 7, 2021 Updated: January 25, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Stack-based buffer overflow (CVE-ID: CVE-2021-20038)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTTP GET requests in the SonicWall SMA SSLVPN. A remote unauthenticated attacker can send a specially crafted HTTP request to the SSL VPN interface, trigger a stack-based buffer overflow in the mod_cgi module and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Command Injection (CVE-ID: CVE-2021-20039)
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to the SonicWall
SMA SSLVPN `/cgi-bin/viewcert` endpoint allows users to upload, view, or delete SSL certificates. A remote authenticated user can send a specially crafted HTTP POST request to the affected SSL VPN interface and execute arbitrary commands on the system with root privileges.
3) Arbitrary file upload (CVE-ID: CVE-2021-20040)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to the appliance allows unauthenticated file upload. A remote non-authenticated attacker can send a specially crafted HTTP request to the appliance and upload arbitrary file to any directory on the system.
4) Infinite loop (CVE-ID: CVE-2021-20041)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in the "/fileshare/sonicfiles/sonicfiles" endpoint in the `fileexplorer` process. A remote non-authenticated attacker can send specially crafted HTTP request to the system and consume all available CPU resources.
5) Unintended Proxy or Intermediary (CVE-ID: CVE-2021-20042)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to missing security checks that allow a remote non-authenticated attacker to bypass firewall rules and use undetected the appliance as intermediary proxy to access internal and external resources.
6) Heap-based buffer overflow (CVE-ID: CVE-2021-20043)
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the RAC_GET_BOOKMARKS_HTML5 (RacNumber 35) method that allows users to list their bookmarks. A remote user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
7) Improper access control (CVE-ID: CVE-2021-20044)
The vulnerability allows a remote user to execute arbitrary code on the system.
The vulnerability exists due to improper access restrictions in the Management API. A remote user can bypass implemented security restrictions and execute system commands as ‘nobody’ user.
8) Heap-based buffer overflow (CVE-ID: CVE-2021-20045)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the RAC_COPY_TO (RacNumber 36) method which allows users to upload files to an SMB share and can be called without any authentication. A remote attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.