Description
A local privilege escalation vulnerability exists in the safe_asterisk script included with the Asterisk toolkit package. When Asterisk is started via this script (common in SysV init or FreePBX environments), it sources all .sh files located in /etc/asterisk/startup.d/ as root, without validating ownership or permissions. Non-root users with legitimate write access to /etc/asterisk can exploit this behaviour by placing malicious scripts in the startup.d directory, which will then execute with root privileges upon service restart.
Problem types
CWE-427 Uncontrolled Search Path Element
Product status
Asterisk <=18.26.2 (custom)
Asterisk <= 20.15.0 (custom)
Asterisk <= 21.10.0 (custom)
Asterisk <= 22.5.0 (custom)
Credits
Abdul Mhanni
References
lists.debian.org/debian-lts-announce/2025/10/msg00006.html
github.com/...terisk/security/advisories/GHSA-v9q8-9j8m-5xwp