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Advisory severityHigh8.6Red Hat Linux

High [CVE-2025-59088] Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv

This high-severity Red Hat Linux advisory covers CVE-2025-59088 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.2 Advanced Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-59088 Source published Source updated

VulniPulse record published

CVE-2025-59088
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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.

Red Hat severity: Important — CVSS 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N). Weakness: CWE-918.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 11 more.

Is CVE-2025-59088 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2025-59088 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2025-59088?

Upgrade to a fixed release named by Red Hat:

  • python-kdcproxy-0:1.0.0-19.el10_1
  • python-kdcproxy-0:1.0.0-19.el10_0
  • python-kdcproxy-0:0.3.2-3.el7_9.3
  • idm:client-8100020251103113748.143e9e98
  • idm:DL1-8100020251028161822.823393f5
  • idm:DL1-8020020251106022345.792f4060
  • idm:DL1-8040020251103205102.5b01ab7e
  • idm:DL1-8060020251030180424.ada582f1
  • idm:DL1-8080020251029082621.b0a6ceea
  • python-kdcproxy-0:1.0.0-9.el9_7
  • python-kdcproxy-0:1.0.0-7.el9_0.1
  • python-kdcproxy-0:1.0.0-7.el9_2.1

15 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions
  • python-kdcproxy-0:1.0.0-19.el10_1
  • python-kdcproxy-0:1.0.0-19.el10_0
  • python-kdcproxy-0:0.3.2-3.el7_9.3
  • idm:client-8100020251103113748.143e9e98
  • idm:DL1-8100020251028161822.823393f5
  • idm:DL1-8020020251106022345.792f4060
  • idm:DL1-8040020251103205102.5b01ab7e
  • idm:DL1-8060020251030180424.ada582f1
  • idm:DL1-8080020251029082621.b0a6ceea
  • python-kdcproxy-0:1.0.0-9.el9_7
  • python-kdcproxy-0:1.0.0-7.el9_0.1
  • python-kdcproxy-0:1.0.0-7.el9_2.1
  • python-kdcproxy-0:1.0.0-7.el9_4.1
  • python-kdcproxy-0:1.0.0-9.el9_6
  • RHSA-2025:21142
  • RHSA-2025:21141
  • RHSA-2025:22982
  • RHSA-2025:21140
  • RHSA-2025:21821
  • RHSA-2025:21820
  • RHSA-2025:21819
  • RHSA-2025:21818
  • RHSA-2025:21139
  • RHSA-2025:21806
  • RHSA-2025:21448
  • RHSA-2025:21748
  • RHSA-2025:21138

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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