Executive brief
Netatalk, a file server suite that allows Linux and Unix systems to serve files to Apple computers, contains a security flaw in its authentication modules. The software fails to stop execution if it cannot properly lower its system privileges, potentially allowing operations to run with higher authority than intended. While difficult to exploit in standard setups, it poses a risk to data integrity and confidentiality if the system's security boundaries fail.
Technical details
Netatalk versions 1.5.0 through 4.4.2 contain a CWE-273 (Improper Check for Dropped Privileges) vulnerability. The authentication modules log failures of the seteuid() system call but continue execution instead of aborting. This flaw allows a process to potentially operate with root or elevated privileges when it should have transitioned to a lesser-privileged user context. Exploitation is considered difficult (AC:H) as an attacker typically cannot force a seteuid failure under normal conditions, but it represents a significant defense-in-depth failure. The issue is resolved in version 4.5.0.
Affected products
- Netatalk team Netatalk 1.5.0 through 4.4.2
Timeline
- 2026-05-13: disclosed
- 2026-05-21: advisory: NVD publication date
- 2026-05-21: patched: Fixed in version 4.5.0