CVE-2025-59088

Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv

publishedCWE-918

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.

Technical severity8.6 highCVSS 3.1 · CNA: redhat

Published2025-11-12Source updated 2026-11-04

Collected2026-11-042 attributed sources

Fixes and workarounds

Workaround

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.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
kdcproxy latchset `kdcproxy` https://github.com/latchset/kdcproxy	≥ 0; < 1.1.0 (affected, semver) Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-19.el10_1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-19.el10_0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:0.3.2-3.el7_9.3; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `idm:client` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020251103113748.143e9e98; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020251028161822.823393f5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8020020251106022345.792f4060; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020251103205102.5b01ab7e; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020251103205102.5b01ab7e; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020251030180424.ada582f1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Telecommunications Update Service Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020251030180424.ada582f1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020251030180424.ada582f1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020251029082621.b0a6ceea; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `idm:DL1` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020251029082621.b0a6ceea; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-9.el9_7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-7.el9_0.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-7.el9_2.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Extended Update Support Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-7.el9_4.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `python-kdcproxy` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.0.0-9.el9_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 8.6 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2025:21138CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21139CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21140CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21141CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21142CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21448CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21748CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21806CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21818CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21819CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21820CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21821CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:22982CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-59088CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2393955CNA: redhat · issue-tracking, x_refsource_REDHAT
https://github.com/latchset/kdcproxy/pull/68CNA: redhat

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