CVE-2023-33192
Improper handling of NTS cookie length that could crash the ntpd-rs server
Impact
### Impact 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. ntpd-rs running purely as an ntp client is not affected. ### Patches 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 ### Workarounds ntpd-rs running purely as an ntp client is not affected. By default, ntpd-rs packages are not configured to run as a server. For machines where serving the time is required, there is no known workaround. Users are recommended to upgrade ntpd-rs as soon as possible. ### References https://github.com/pendulum-project/ntpd-rs/pull/752 We would like to thank @mlichvar for identifying this issue
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | ntpd | >= 0.3.0, < 0.3.3 | 0.3.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Tweedegolf | Ntpd-Rs | from 0.3.0 before 0.3.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/pendulum-project/ntpd-rs/pull/752
- https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-qwhm-h7v3-mrjx
- https://github.com/advisories/GHSA-qwhm-h7v3-mrjx
- https://github.com/pendulum-project/ntpd-rs/releases/tag/v0.3.3
- https://nvd.nist.gov/vuln/detail/CVE-2023-33192