CVE-2023-33192 Improper handling of NTS cookie length that could crash the ntpd-rs server
An attacker can crash the ntpd-rs server by sending specially crafted NTS packets with invalid cookie lengths, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-33192?
CVE-2023-33192 is a high-severity denial of service vulnerability in pendulum-project ntpd-rs, published on 27 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ntpd-rs is an NTP implementation written in Rust. ntpd-rs does not validate the length of NTS cookies in received NTP packets to the server. An attacker can crash the server by sending a specially crafted NTP packet containing a cookie shorter than what the server expects. The server also crashes when it is not configured to handle NTS packets. The issue was caused by improper slice indexing. The indexing operations were replaced by safer alternatives that do not crash the ntpd-rs server process but instead properly handle the error condition. A patch was released in version 0.3.3.
Weakness: CWE-130
Which versions are affected by CVE-2023-33192?
2 open source packages ship an affected version, including ntpd. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ntpd crates.io | From 0.3.0 | 0.3.3 |
ntpd crates.io | From 0.3.0 | 0.3.3 |
Products include Tweedegolf Ntpd-Rs.
How do I fix CVE-2023-33192?
Upgrade ntpd to 0.3.3 or later.
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-2023-33192 being exploited?
There is no known exploitation of CVE-2023-33192 in the wild and no public exploit code.
Other vulnerabilities in pendulum-project ntpd-rs
Sources
Also known as GHSA-qwhm-h7v3-mrjx.