GHSA-2xpx-vcmq-5f72

Source

https://github.com/advisories/GHSA-2xpx-vcmq-5f72

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/06/GHSA-2xpx-vcmq-5f72/GHSA-2xpx-vcmq-5f72.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-2xpx-vcmq-5f72

Aliases

CVE-2024-38528

Published

2024-06-28T21:05:52Z

Modified

2024-07-02T02:26:15Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Unlimited number of NTS-KE connections can crash ntpd-rs server

Details

Summary

Missing limit for accepted NTS-KE connections allows an unauthenticated remote attacker to crash ntpd-rs when an NTS-KE server is configured. Non NTS-KE server configurations, such as the default ntpd-rs configuration, are unaffected.

Details

Operating systems have a limit for the number of open file descriptors (which includes sockets) in a single process, e.g. 1024 on Linux by default. When ntpd-rs is configured as an NTS server, it accepts TCP connections for the NTS-KE service. If the process has reached the descriptor limit and tries to accept a new TCP connection, the accept() system call will return with the EMFILE error and cause ntpd-rs to abort.

A remote attacker can open a large number of parallel TCP connections to the server to trigger this crash. The connections need to be opened quickly enough to avoid the key-exchange-timeout-ms timeout (by default 1000 milliseconds).

Impact

Only NTS-KE server configuration are affected. Those without an NTS-KE server configuration such as NTS client only or NTP only configuration are unaffected. For affected configurations the ntpd-rs daemon can made completely unavailable by crashing the service. If ntpd-rs is automatically restarted, an attacker can repeat the attack to prevent ntpd-rs from doing anything useful.

Workarounds

Disable NTS-KE server functionality
Increase system resource limits (RLIMIT_NOFILE) to make the attack more difficult
Lower the key-exchange-timeout-ms configuration setting to make the attack more difficult

Database specific

{
    "nvd_published_at": "2024-06-28T20:15:02Z",
    "cwe_ids": [
        "CWE-770"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2024-06-28T21:05:52Z"
}

References

Affected packages

crates.io / ntpd

Package

Name: ntpd; View open source insights on deps.dev
Purl: pkg:cargo/ntpd

Affected ranges

Type: SEMVER
Events: Introduced

0.3.1

Fixed

1.1.3

Database specific

{
    "last_known_affected_version_range": "<= 1.1.2"
}