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Advisories

LibreTV before v2.21.2 SSRF Protection Bypass via DNS Rebinding

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Severity
low
Date
Affecting

  • LibreTV >= 0, < v2.21.2

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS
2.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Credit
George Chen, Gaoshou101
Description
LibreTV before v2.21.2 contains a server-side request forgery vulnerability that allows authenticated users to bypass checkUpstreamAllowed() by exploiting unpinned DNS resolution in fetchWithSafeRedirects(). Attackers controlling authoritative DNS can return public addresses during validation and internal addresses at connection time via /api/source/test, /api/proxy, /api/search or /api/detail to reach loopback services, private hosts or cloud metadata endpoints.

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