CVE-2023-42669 (GCVE-0-2023-42669)
Vulnerability from cvelistv5
Published
2023-11-06 06:57
Modified
2025-08-30 06:26
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-400 - Uncontrolled Resource Consumption
Summary
A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as "rpcecho" runs in the main RPC task.
References
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Impacted products
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Version: 4.0.0 ≤ Version: 4.18.0 ≤ Version: 4.19.0 |
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[\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"samba\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:/a:redhat:storage:3\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Storage 3\", \"packageName\": \"samba\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2023-10-03T00:00:00+00:00\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2023-10-10T00:00:00+00:00\", \"value\": \"Made public.\"}], \"datePublic\": \"2023-10-10T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2023:6209\", \"name\": \"RHSA-2023:6209\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:6744\", \"name\": \"RHSA-2023:6744\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:7371\", \"name\": \"RHSA-2023:7371\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:7408\", \"name\": \"RHSA-2023:7408\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:7464\", \"name\": \"RHSA-2023:7464\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:7467\", \"name\": \"RHSA-2023:7467\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2023-42669\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2241884\", \"name\": \"RHBZ#2241884\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.samba.org/show_bug.cgi?id=15474\"}, {\"url\": \"https://www.samba.org/samba/security/CVE-2023-42669.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"To mitigate this vulnerability, disable rpcecho service on the AD DC by setting:\\n~~~\\ndcerpc endpoint servers = -rpcecho\\n~~~\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability was found in Samba\u0027s \\\"rpcecho\\\" development server, a non-Windows RPC server used to test Samba\u0027s DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the \\\"rpcecho\\\" service operates with only one worker in the main RPC task, allowing calls to the \\\"rpcecho\\\" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a \\\"sleep()\\\" call in the \\\"dcesrv_echo_TestSleep()\\\" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the \\\"rpcecho\\\" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as \\\"rpcecho\\\" runs in the main RPC task.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-11-20T18:28:20.323Z\"}, \"x_redhatCweChain\": \"CWE-400: Uncontrolled Resource Consumption\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-42669\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-20T18:28:20.323Z\", \"dateReserved\": \"2023-09-13T04:22:28.796Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2023-11-06T06:57:28.981Z\", \"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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