CVE-2024-6409 (GCVE-0-2024-6409)
Vulnerability from cvelistv5 – Published: 2024-07-08 17:57 – Updated: 2026-08-21 12:24
VLAI
EPSS
VEX
Title
Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-11 00:00 UTC
CWE
- CWE-364 - Signal Handler Race Condition
Assigner
References
23 references
Impacted products
12 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:8.7p1-38.el9_4.4 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/o:redhat:enterprise_linux:9::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
0:8.7p1-12.el9_0.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0::appstream cpe:/o:redhat:rhel_e4s:9.0::baseos |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support |
Unaffected:
0:8.7p1-30.el9_2.7 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.2::appstream cpe:/o:redhat:rhel_eus:9.2::baseos |
||
| Red Hat | Red Hat OpenShift Container Platform 4.13 |
Unaffected:
413.92.202408122222-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.13::el8 cpe:/a:redhat:openshift:4.13::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.14 |
Unaffected:
414.92.202407300859-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.14::el8 cpe:/a:redhat:openshift:4.14::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.15 |
Unaffected:
415.92.202407301159-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.15::el8 cpe:/a:redhat:openshift:4.15::el9 |
||
| Red Hat | Red Hat OpenShift Container Platform 4.16 |
Unaffected:
416.94.202407171205-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.16::el9 |
||
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
||
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
||
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
||
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
Date Public
2024-07-08 17:45
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\"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:rhel_e4s:9.0::appstream\", \"cpe:/o:redhat:rhel_e4s:9.0::baseos\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:8.7p1-12.el9_0.3\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:rhel_eus:9.2::appstream\", \"cpe:/o:redhat:rhel_eus:9.2::baseos\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.2 Extended Update Support\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:8.7p1-30.el9_2.7\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4.13::el8\", \"cpe:/a:redhat:openshift:4.13::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4.13\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"413.92.202408122222-0\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhcos\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4.14::el8\", \"cpe:/a:redhat:openshift:4.14::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4.14\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"414.92.202407300859-0\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhcos\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": 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\"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:6\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2024-07-01T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2024-07-08T17:45:07.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2024-07-08T17:45:07.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2024:4457\", \"name\": \"RHSA-2024:4457\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4613\", \"name\": \"RHSA-2024:4613\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4716\", \"name\": \"RHSA-2024:4716\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4910\", \"name\": \"RHSA-2024:4910\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4955\", \"name\": \"RHSA-2024:4955\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"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.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"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\": \"2026-08-21T12:24:37.561Z\"}, \"x_redhatCweChain\": \"CWE-364: Signal Handler Race Condition\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-6409\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T12:24:37.561Z\", \"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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