CVE-2020-28242 Denial of service in n/a
A remote attacker can cause Asterisk to consume excessive memory and crash by triggering an infinite INVITE loop during outbound authentication challenges.
- 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-2020-28242?
CVE-2020-28242 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 6 Nov 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.
Weakness: CWE-674
Which versions are affected by CVE-2020-28242?
It affects 4 products.
Products include Asterisk Certified Asterisk, Debian Debian Linux, Fedoraproject Fedora, Sangoma Asterisk.
How do I fix CVE-2020-28242?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-28242 being exploited?
There is no known exploitation of CVE-2020-28242 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-28242, GHSA-q5gr-h5mj-hp63, UBUNTU-CVE-2020-28242.