GHSA-2XPX-VCMQ-5F72
Vulnerability from github – Published: 2024-06-28 21:05 – Updated: 2024-07-02 02:26Summary
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-msconfiguration setting to make the attack more difficult
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.1.2"
},
"package": {
"ecosystem": "crates.io",
"name": "ntpd"
},
"ranges": [
{
"events": [
{
"introduced": "0.3.1"
},
{
"fixed": "1.1.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-38528"
],
"database_specific": {
"cwe_ids": [
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2024-06-28T21:05:52Z",
"nvd_published_at": "2024-06-28T20:15:02Z",
"severity": "HIGH"
},
"details": "### Summary\nMissing 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.\n\n### Details\nOperating 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.\n\nA 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).\n\n### Impact\nOnly 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.\n\n### Workarounds\n- Disable NTS-KE server functionality\n- Increase system resource limits (`RLIMIT_NOFILE`) to make the attack more difficult\n- Lower the `key-exchange-timeout-ms` configuration setting to make the attack more difficult",
"id": "GHSA-2xpx-vcmq-5f72",
"modified": "2024-07-02T02:26:15Z",
"published": "2024-06-28T21:05:52Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38528"
},
{
"type": "WEB",
"url": "https://github.com/pendulum-project/ntpd-rs/commit/6049687006ea5b26eeac927964b5fcc80d7bde50"
},
{
"type": "PACKAGE",
"url": "https://github.com/pendulum-project/ntpd-rs"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Unlimited number of NTS-KE connections can crash ntpd-rs server"
}
Sightings
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|---|
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