CVE-2025-59089 (GCVE-0-2025-59089)
Vulnerability from cvelistv5
Published
2025-11-12 16:40
Modified
2025-11-19 08:16
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new buffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response header, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients.
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:1.0.0-19.el10_1   < *
    cpe:/o:redhat:enterprise_linux:10.1
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   Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:1.0.0-19.el10_0   < *
    cpe:/o:redhat:enterprise_linux_eus:10.0
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   Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251103113748.143e9e98   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
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   Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251028161822.823393f5   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
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   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:1.0.0-9.el9_7   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
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   Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:1.0.0-7.el9_2.1   < *
    cpe:/a:redhat:rhel_e4s:9.2::appstream
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   Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:1.0.0-7.el9_4.1   < *
    cpe:/a:redhat:rhel_eus:9.4::appstream
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   Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:1.0.0-9.el9_6   < *
    cpe:/a:redhat:rhel_eus:9.6::appstream
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   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Show details on NVD website


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\"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:21142\", \"name\": \"RHSA-2025:21142\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:21448\", \"name\": \"RHSA-2025:21448\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:21748\", \"name\": \"RHSA-2025:21748\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2025-59089\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2393958\", \"name\": \"RHBZ#2393958\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://github.com/latchset/kdcproxy/pull/68\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC\u0027s response, kdcproxy copies the entire buffered stream into a new\\nbuffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response\\nheader, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-11-19T08:16:52.264Z\"}, \"x_redhatCweChain\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-59089\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-19T08:16:52.264Z\", \"dateReserved\": \"2025-09-08T21:43:30.846Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2025-11-12T16:40:50.725Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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