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

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Summary

CVECVE-2025-59088
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-12 17:15:38 UTC
Updated2026-06-30 01:16:28 UTC
DescriptionIf 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.004060000 probability, percentile 0.324770000 (date 2026-07-01)

Problem Types: CWE-918 | CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNACVSS8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Latchset Kdcproxy affected 1.1.0 semver Not specified
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:1.0.0-19.el10_1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:1.0.0-19.el10_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:0.3.2-3.el7_9.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 8100020251103113748.143e9e98 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 8100020251028161822.823393f5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 8020020251106022345.792f4060 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 8040020251103205102.5b01ab7e * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 8040020251103205102.5b01ab7e * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 8060020251030180424.ada582f1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 8060020251030180424.ada582f1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 8060020251030180424.ada582f1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 8080020251029082621.b0a6ceea * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 8080020251029082621.b0a6ceea * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.0.0-9.el9_7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:1.0.0-7.el9_0.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:1.0.0-7.el9_2.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:1.0.0-7.el9_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:1.0.0-9.el9_6 * rpm Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2025:21142 [email protected] access.redhat.com
github.com/latchset/kdcproxy/pull/68 [email protected] github.com
access.redhat.com/errata/RHSA-2025:21820 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21819 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21141 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21821 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21818 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21140 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21748 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:22982 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21448 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2025-59088 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2025:21139 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21138 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21806 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Arad Inbar for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2025-09-08T21:18:31.461ZReported to Red Hat.
CNA2025-11-12T00:00:00.000ZMade public.

Workarounds

CNA: 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.

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