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Advisories

WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi

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severity
high
date
Affecting

  • WDR201A WiFi Extender firmware LFMZX28040922V1.02

CWE
  • CWE-121: Stack-based Buffer Overflow
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Credit
Daniele Berardinelli, Matteo Strada
Description
WDR201A WiFi Extender (HW V2.1, FW LFMZX28040922V1.02) contains a stack-based buffer overflow vulnerability in the firewall.cgi and makeRequest.cgi binaries that allows unauthenticated attackers to overwrite the saved return address by sending a POST request with a Content-Length header exceeding 512 bytes. Attackers can exploit insufficient length validation in the fgets() call to achieve arbitrary code execution through return-oriented programming or return-to-libc techniques.

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