CVE-2024-6409 (GCVE-0-2024-6409)
Vulnerability from cvelistv5
Published
2024-07-08 17:57
Modified
2025-11-11 16:04
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-364 - Signal Handler Race Condition
Summary
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
References
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Impacted products
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\"https://access.redhat.com/errata/RHSA-2024:4960\", \"name\": \"RHSA-2024:4960\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:5444\", \"name\": \"RHSA-2024:5444\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2024-6409\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2295085\", \"name\": \"RHBZ#2295085\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"The process is identical to CVE-2024-6387, by disabling LoginGraceTime. See that CVE page for additional details.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A race condition vulnerability was discovered in how signals are handled by OpenSSH\u0027s server (sshd). If a remote attacker does not authenticate within a set time period, then sshd\u0027s SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-364\", \"description\": \"Signal Handler Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-11-11T16:04:08.572Z\"}, \"x_redhatCweChain\": \"CWE-364: Signal Handler Race Condition\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-6409\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-11T16:04:08.572Z\", \"dateReserved\": \"2024-06-28T18:10:24.954Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2024-07-08T17:57:10.517Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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