Vendor: SonicWall
Vendor URL: https://www.sonicwall.com/
Versions affected: 10.2.0.8-37sv, 10.2.1.1-19sv
Systems Affected: SMA 100 Series (SMA 200, 210, 400, 410, 500v)
Author: Richard Warren <richard.warren[at]nccgroup[dot]trust>
Advisory URL: https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
CVE Identifier: CVE-2021-20045
Risk: CVSS 9.4 (Critical)Summary
SonicWall SMA 100 Series appliances running firmware versions 10.2.0.8-37sv, 10.2.1.1-19sv and below, are vulnerable to multiple stack-based and heap-based buffer overflows in the fileexplorer component, which can be reached by an unauthenticated attacker, calling the sonicfiles RAC_COPY_TO method. These vulnerabilities arise due to the unchecked use of strcpy with a fixed size buffer.
Impact
An unauthenticated remote attacker that successfully exploits any of these issues may be able to execute arbitrary code with the privileges of the nobody user.
Vendor Communication
2021-10-29 - Vulnerability reported to SonicWall PSIRT.
2021-11-02 - Acknowledgement from SonicWall PSIRT.
2021-12-01 - SonicWall request that NCC Group withhold technical details until 2022-01-11, releasing high-level advisories on 2021-12-09.
2021-12-03 - NCC Group agrees to suggested disclosure timeline.
2021-12-07 - Patch released and SonicWall publish KB article and security advisory.
2021-12-09 - NCC Group advisory released.Thanks to
Jennifer Fernick and Aaron Haymore from NCC Group for their assistance with disclosure.
About NCC Group
NCC Group is a global expert in cybersecurity and risk mitigation, working with businesses to protect their brand, value and reputation against the ever-evolving threat landscape. With our knowledge, experience and global footprint, we are best placed to help businesses identify, assess, mitigate & respond to the risks they face. We are passionate about making the Internet safer and revolutionizing the way in which organizations think about cybersecurity.
Published Date: 2021-12-09
Written By: Richard Warren
Published