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WID-SEC-W-2025-2586
Vulnerability from csaf_certbund - Published: 2025-11-12 23:00 - Updated: 2025-11-19 23:00Summary
Red Hat Enterprise Linux (python-kdcproxy): Mehrere Schwachstellen
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution.
Angriff
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um Informationen offenzulegen und um einen Denial-of-Service-Zustand zu verursachen.
Betroffene Betriebssysteme
- UNIX
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},
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"category": "external",
"summary": "Red Hat Security Advisory RHSA-2025:21448 vom 2025-11-17",
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CVE-2025-59089 (GCVE-0-2025-59089)
Vulnerability from cvelistv5 – Published: 2025-11-12 16:40 – Updated: 2025-11-20 21:27
VLAI?
EPSS
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.
Severity ?
5.9 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
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 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Credits
Red Hat would like to thank Arad Inbar for reporting this issue.
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CVE-2025-59088 (GCVE-0-2025-59088)
Vulnerability from cvelistv5 – Published: 2025-11-12 16:35 – Updated: 2025-11-20 08:56
VLAI?
EPSS
Summary
If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where
the "use_dns" setting is explicitly set to false are not affected.
Severity ?
8.6 (High)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||||||||||||||||||||
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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 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Credits
Red Hat would like to thank Arad Inbar for reporting this issue.
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"value": "To mitigate this issue before a final fix can be applied, set \"use_dns\" parameter to false in the global section of the kdcproxy.conf file. This will disable the use of DNS to find Active Directory servers so it may break the service if DNS is needed."
}
],
"x_redhatCweChain": "CWE-918: Server-Side Request Forgery (SSRF)"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2025-59088",
"datePublished": "2025-11-12T16:35:27.877Z",
"dateReserved": "2025-09-08T21:43:30.845Z",
"dateUpdated": "2025-11-20T08:56:05.899Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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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