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Advisories

Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler

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Severity
medium
Date
Affecting

  • uptime-kuma <= 2.5.8

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Abraxas Labs
Description
Uptime Kuma through 2.5.8 contains a race condition in the Socket.IO first-run setup handler that allows unauthenticated attackers to create an additional administrator account. Attackers can send concurrent setup requests during the bcrypt hashing window to bypass the empty user table check, then modify monitors, API keys, and enable disableAuth.

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