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Advisories

Wasmtime 48.0.0 before 48.0.8 TOCTOU UDP Send Policy Bypass via wasip3 Sockets

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Severity
medium
Date
Affecting

  • wasmtime >= 48.0.0, < 48.0.8

  • wasmtime >= 49.0.0, < 49.0.5

  • wasmtime >= 50.0.0, < 50.0.1

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Credit
las7, rvolosatovs
Description
Wasmtime's wasmtime-wasi crate 48.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 contains a time-of-check/time-of-use race in the wasip3 wasi:sockets udp-socket host implementation that lets guests bypass socket_addr_check send restrictions. A malicious guest can race udp-socket.send against udp-socket.connect to deliver attacker-controlled datagrams to addresses the policy permits only for receiving.

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