PT-2021-19516 · NetGear · Netgear R7000

Colorlight2019 · Published 2021-04-26 · Updated 2021-05-06 · CVE-2021-31802

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 R7000 version 1.0.11.116

Description The issue is a heap-based Buffer Overflow that can be exploited from the local network without authentication. It exists within the handling of an HTTP request, specifically during the upload of a backup.cgi file, where a user-provided length value is trusted. This allows an attacker to execute code as root by adding a before the Content-Length header.

Recommendations For NETGEAR R7000 version 1.0.11.116, consider disabling the backup.cgi file upload functionality until a patch is available to prevent exploitation of the heap-based Buffer Overflow. Restrict access to the HTTP request handling to minimize the risk of code execution as root. Avoid trusting user-provided length values during file uploads to prevent similar issues. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-31802

Affected Products

Netgear R7000

References · 8

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/http/netgear_r7000_backup_cgi_heap_overflow_rce.rb · Exploit
• 🔥 https://ssd-disclosure.com/ssd-advisory-netgear-nighthawk-r7000-httpd-preauth-rce · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-31802 · Security Note
• https://netgear.com/about/security · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31802 · Vendor Advisory
• https://t.me/ckure/7765 · Telegram Post
• https://t.me/cybersecuritytechnologies/3231 · Telegram Post
• https://t.me/cvenotify/14187 · Telegram Post