CVE-2024-42365 Asterisk allows `Write=originate` as sufficient permissions for code execution / `System()` dialplan
An Asterisk AMI user with originate permissions can modify configuration files to achieve remote code execution and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-42365?
CVE-2024-42365 is a high-severity vulnerability in asterisk, published on 8 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Asterisk is an open source private branch exchange (PBX) and telephony toolkit. Prior to asterisk versions 18.24.2, 20.9.2, and 21.4.2 and certified-asterisk versions 18.9-cert11 and 20.7-cert2, an AMI user with `write=originate` may change all configuration files in the `/etc/asterisk/` directory. This occurs because they are able to curl remote files and write them to disk, but are also able to append to existing files using the `FILE` function inside the `SET` application. This issue may result in privilege escalation, remote code execution and/or blind server-side request forgery with arbitrary protocol. Asterisk versions 18.24.2, 20.9.2, and 21.4.2 and certified-asterisk versions 18.9-cert11 and 20.7-cert2 contain a fix for this issue.
Which versions are affected by CVE-2024-42365?
It affects 2 products.
Products include Asterisk Asterisk, Asterisk Certified Asterisk.
How do I fix CVE-2024-42365?
Upgrade to a fixed version.
Is CVE-2024-42365 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-42365 exists.
Public exploit code: 1 Metasploit module and 1 proofs of concept on GitHub.
Other vulnerabilities in asterisk
Sources
Also known as ALPINE-CVE-2024-42365, DEBIAN-CVE-2024-42365, GHSA-c4cg-9275-6w44, UBUNTU-CVE-2024-42365.