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Advisories

Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token

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Severity
high
Date
Affecting

  • transmission >= 4.0.0, < 4.1.3

CWE
  • CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Joshua Rogers, ckerr
Description
Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handle_request() in rpc-server.cc that exposes the X-Transmission-Session-Id anti-CSRF token to any web origin. Malicious web pages can read the token from the 409 handshake response and replay it to issue RPC calls, enabling script-torrent-done execution, download-dir changes, or torrent and data deletion.

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