PT-2021-17356 · NetGear · Netgear R7800

Atdog · Published 2021-02-24 · Updated 2021-04-27 · CVE-2021-27252

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: NETGEAR R7800 version 1.0.2.76

Description: This issue allows network-adjacent attackers to execute arbitrary code on affected installations. Authentication is not required to exploit this issue. The specific flaw exists within the handling of the vendor specific DHCP opcode. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this issue to execute code in the context of root.

Recommendations: For NETGEAR R7800 version 1.0.2.76, consider applying a patch or update that addresses the improper validation of user-supplied strings in the handling of the vendor specific DHCP opcode. As a temporary workaround, restrict access to the DHCP service to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2021-27252

ZDI-21-248

Affected Products

Netgear R7800

References · 5

• https://zerodayinitiative.com/advisories/ZDI-21-248 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27252 · Vendor Advisory
• https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27252 · Security Note
• https://t.me/cvenotify/13822 · Telegram Post