CVE-2025-59089 (GCVE-0-2025-59089)

Vulnerability from cvelistv5 – Published: 2025-11-12 16:40 – Updated: 2025-11-20 21:27
VLAI?
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.
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
https://access.redhat.com/errata/RHSA-2025:21138 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21139 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21140 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21141 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21142 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21448 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21748 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21806 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21818 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21819 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21820 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21821 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-59089 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2393958 issue-trackingx_refsource_REDHAT
https://github.com/latchset/kdcproxy/pull/68
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:1.0.0-19.el10_1 , < * (rpm)
    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 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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    Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251103113748.143e9e98 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
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    Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020251028161822.823393f5 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
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    Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support Unaffected: 8020020251106022345.792f4060 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.2::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020251103205102.5b01ab7e , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/a:redhat:rhel_aus:8.4::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020251103205102.5b01ab7e , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/a:redhat:rhel_aus:8.4::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020251030180424.ada582f1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service Unaffected: 8060020251030180424.ada582f1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Unaffected: 8060020251030180424.ada582f1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020251029082621.b0a6ceea , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020251029082621.b0a6ceea , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
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    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:1.0.0-9.el9_7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
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    Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 0:1.0.0-7.el9_0.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:1.0.0-7.el9_2.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:1.0.0-7.el9_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:1.0.0-9.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Credits
Red Hat would like to thank Arad Inbar for reporting this issue.
Show details on NVD website

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}


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Sightings

Author Source Type Date

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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