CVE-2023-39342: Dangerzone CLI does not sanitize ANSI escape characters

Severity: low (CVSS 3.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-08 · updated 2026-06-17
Weakness: CWE-150

Description

Dangerzone is software for converting potentially dangerous PDFs, office documents, or images to safe PDFs. The Dangerzone CLI (`dangerzone-cli` command) logs output from the container where the file sanitization takes place, to the user's terminal. Prior to version 0.4.2, if the container is compromised and can return attacker-controlled strings, then the attacker may be able to spoof messages in the user's terminal or change the window title. Besides logging output from containers, it also logs the names of the files it sanitizes. If these files contain ANSI escape sequences, then the same issue applies. Dangerzone is predominantly a GUI application, so this issue should leave most of our users unaffected. Nevertheless, we always suggest updating to the newest version. This issue is fixed in Dangerzone 0.4.2.

Affected products

freedomofpress dangerzone: before 0.4.2 — fixed in 0.4.2

How to fix

Upgrade to a fixed version: freedomofpress dangerzone 0.4.2. Check the vendor advisory for mitigations.

References

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