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CVE Record

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

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.

HighCVSS 8.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Kdcproxy can be tricked into making network connections chosen through attacker-controlled DNS SRV records. The business risk is internal network exposure from a service that may sit near identity infrastructure. Deployments with use_dns explicitly set to false are stated as not affected.

Executive priority

Prioritize remediation for identity-facing or internet-reachable kdcproxy deployments, especially on affected Red Hat platforms. The issue is high severity because it can turn a trusted service into an internal network probing path without authentication.

Technical view

When a requested realm lacks configured server addresses, kdcproxy may query SRV records under that realm. An unauthenticated requester controlling that DNS zone can influence target hostnames and ports, creating CWE-918 SSRF. The supplied CVSS is 8.6, with high confidentiality impact and no stated integrity or availability impact.

Likely exposure

Affected exposure is Red Hat python-kdcproxy or IdM client/DL1 packages on listed RHEL 7 ELS, 8 streams, 9 streams, and 10 variants where kdcproxy is deployed and use_dns is not explicitly false.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. It describes unauthenticated network access with low attack complexity and no user interaction. Practical impact is probing internal topology, firewall rules, port reachability, and possible data exfiltration through server-side requests.

Researcher notes

The strongest evidence is the CVE description, affected Red Hat package list, CVSS vector, and vendor advisories. Evidence in the bundle does not confirm exploitation in the wild. Treat use_dns=false as a clear non-affected condition, but validate actual runtime configuration.

Mitigation direction

  • Set kdcproxy use_dns explicitly to false where DNS discovery is not required.
  • Define trusted server addresses for realms instead of relying on DNS SRV fallback.
  • Review the listed Red Hat RHSA advisories for applicable package updates.
  • Restrict network egress from kdcproxy to expected Kerberos infrastructure.
  • Monitor vendor guidance before assuming upstream or downstream fix availability.

Validation and detection

  • Inventory systems running kdcproxy, python-kdcproxy, or affected Red Hat IdM module streams.
  • Check kdcproxy configuration for use_dns and missing realm server address definitions.
  • Map affected RHEL versions against the package and stream list in the CVE bundle.
  • Verify whether exposed kdcproxy endpoints are reachable by unauthenticated users.
  • Review egress logs for unexpected connections from kdcproxy hosts.
Prepared
Confidence
high
Sources
11

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-918: Information exposure and cloud metadata lookup

Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Cloud metadata behavior lookup

The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2025-59088 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.6 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
1ADP providers
17Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N3.94redhat

Vulnerability scoring details

Base CVSS 3.1 score

8.6High
CVSS 3.1 vector shape for CVE-2025-59088Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Reported to Red Hat.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. Source timelineredhat

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
latchsetkdcproxykdcproxy, 0unaffected
Red HatRed Hat Enterprise Linux 10python-kdcproxy, 0:1.0.0-19.el10_1affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportpython-kdcproxy, 0:1.0.0-19.el10_0affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportpython-kdcproxy, 0:0.3.2-3.el7_9.3affected
Red HatRed Hat Enterprise Linux 8idm:client, 8100020251103113748.143e9e98affected
Red HatRed Hat Enterprise Linux 8idm:DL1, 8100020251028161822.823393f5affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportidm:DL1, 8020020251106022345.792f4060affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportidm:DL1, 8040020251103205102.5b01ab7eaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onidm:DL1, 8040020251103205102.5b01ab7eaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportidm:DL1, 8060020251030180424.ada582f1affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Serviceidm:DL1, 8060020251030180424.ada582f1affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionsidm:DL1, 8060020251030180424.ada582f1affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Serviceidm:DL1, 8080020251029082621.b0a6ceeaaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionsidm:DL1, 8080020251029082621.b0a6ceeaaffected
Red HatRed Hat Enterprise Linux 9python-kdcproxy, 0:1.0.0-9.el9_7affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionspython-kdcproxy, 0:1.0.0-7.el9_0.1affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionspython-kdcproxy, 0:1.0.0-7.el9_2.1affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportpython-kdcproxy, 0:1.0.0-7.el9_4.1affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportpython-kdcproxy, 0:1.0.0-9.el9_6affected
Weakness

CWE details

CWE-918

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-918 · source CWE mapping

Server-Side Request Forgery (SSRF)

Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs