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Advisories

Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()

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Severity
critical
Date
Affecting

  • NR256CN <= 1.5.140116

CWE
  • CWE-121 Stack-based Buffer Overflow
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Zhou Ao, Yin Luxing, Lu Fangzhou, Liu Xin
Description
Netcore NR256CN through 1.5.140116 contains a pre-authentication stack overflow vulnerability in the Boa web server's user_ok() function, which copies Basic-auth usernames with unbounded strcpy() calls into 64-byte stack buffers. Unauthenticated attackers can send a username longer than 63 bytes to any protected /router/*.cgi route to crash the main Boa process or potentially execute code.

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