Time-of-check Time-of-use (TOCTOU) Race Condition Affecting screen package, versions [4.9.1,5.0.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-SCREEN-10155663
- published14 May 2025
- disclosed12 May 2025
- creditUnknown
Introduced: 12 May 2025
CVE-2025-46805 (opens in a new tab)How to fix?
Upgrade screen to version 5.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition due to the CheckPid() function. This function later sends a signal to the Kill() function, allowing an attacker to change PIU during the signal sending process to target a different, privileged process or trick the daemon into sending signals to itself.
Note:
Currently the CheckPid() function is only allowed to send SIGCONT and SIGHUP signals, making the likely impact to be limited to a local DoS or a minor integrity violation.